Biomass steam in both plans, PV on the factory roof only

User, 17 Oct 2026: "only put solar on the factory, prepare the other
buildings for solar, option a and b should operate on biomass".

- Steam: two 500 kg/h biomass modules (Getabec class, 6M to 10M THB) plus
  a fuel store and handling block (1M to 2M, estimate) in both plans; the
  electric bank becomes the alternative. ~0.67M THB of fuel a year against
  ~4.9M for electric steam; grid demand ~264 kW instead of ~980 kW.
- Solar: ~520 kWp on the factory roof (the biomass-case optimum is ~500 to
  550 kWp, hourly sketch in sustainability.md "PV size with biomass
  steam"); office roof and parking canopies built PV-ready (~120 kWp
  later). ~87 % used on site, ~61 % of the plant's electricity.
- Calculator: biomass default, bFuel row, pvKWp 520, pvSelf 87, iso fills
  the factory roof first and shows the other roofs as PV-ready.
- Numbers: launch plant ~168M / 232M / 296M with contingency; Plan A
  ~182M (~2M above 180M: the Chinese-route lever priced only electric
  boilers; a Chinese biomass quote is the way back), Plan B ~217M (label
  ~215M), ~35M more. Calculator EBITDA A 2.17M, B 2.23M USD.
- CSV, total-investment, revenue-model, sustainability, scale, biomass,
  site-candidates, boi, steam-cooling, construction RFQ (canopies
  PV-ready), README, roadmap; business plan draft 0.3 rebuilt (A and B
  63 pages) with new renders.

README.md

@@ -70,14 +70,15 @@ steps are open planning items.
 - The plant now launches with everything in one capital round (October
   2026): one Newbilt Duplex system and one Classic, a Pheenix galvanics
   line, the Sibert stamper-prep line, a Sillitoe cutting room and the
-  modular boiler and chiller plant: ~168M to 294M THB with contingency
-  (midpoint ~231M, PV on every roof and canopy), the Pheenix line priced at OMS's reference plus 20 %
+  modular boiler and chiller plant: ~168M to 296M THB with contingency
+  (midpoint ~232M; biomass steam, PV on the factory roof), the Pheenix line priced at OMS's reference plus 20 %
   ([total investment](docs/finance/total-investment.md#launch-plant-october-2026)).
   For the investor the business plan comes in two versions, priced
   without contingency and with the ramp-up reserve
   ([two plans](docs/finance/total-investment.md#two-plans-a-at-180m-thb-and-b-at-215m-thb-october-2026)):
-  **Plan A, ~177M THB**, the launch plant with six cost levers, and
-  **Plan B, ~216M THB**, the same launch plant with everything in.
+  **Plan A, ~182M THB** (~2M above 180M since steam went biomass), the
+  launch plant with six cost levers, and **Plan B, ~217M THB**, the same
+  launch plant with everything in.
   Chinese boilers, compressor and hydraulics save about 2M THB of that
   ([Chinese suppliers](docs/suppliers/china-utilities.md)).
   The business plan is re-based on it (draft 0.2).
@@ -282,8 +283,8 @@ The detail lives in dedicated documents:
   output capacity, building area, land, electrical demand, solar and
   storage, steam and fuel, headcount, and money cross-references
 - [Total investment](docs/finance/total-investment.md): the launch plant
-  decided in October 2026 (~168M to 294M THB, ~5.1M to 8.9M USD, midpoint
-  ~231M THB) with the basis of every block, the two plans for the investor
+  decided in October 2026 (~168M to 296M THB, ~5.1M to 9.0M USD, midpoint
+  ~232M THB) with the basis of every block, the two plans for the investor
   (Plan A ~180M, Plan B ~215M THB, without contingency), and the earlier
   answer to the 180M / 216M question; the earlier full vision and phased
   entry are kept as superseded
@@ -294,8 +295,8 @@ The detail lives in dedicated documents:
   and margin per record, the launch plant's operating picture at the
   planned 60 % specials (central revenue ~3.65M USD a year on ~0.74M
   records, EBITDA ~1.7M; the adverse case loses money), the operating
-  pictures of Plan A (payback ~3.1 years on ~177M THB) and Plan B (the
-  same output, payback ~3.8 years on ~216M THB: its extra pays back
+  pictures of Plan A (payback ~3.2 years on ~182M THB) and Plan B (the
+  same output, payback ~3.8 years on ~217M THB: its extra pays back
   through what the table leaves out), the five-press table, and the levers and
   caveats behind the numbers
 - Business plan, draft 0.3 (October 2026), in two versions:

docs/biomass.md

@@ -1,9 +1,18 @@
 # Biomass Fuel Strategy
 
-If the steam boiler goes the biomass route (see the options in
-[sustainability](sustainability.md) and the Getabec candidate in the
-[utilities CSV](finance/utilities-investment.csv)), the fuel comes from two
-sources: the team's own 60 rai of currently unused land, and northern
+**Decided 17 October 2026 (user): both business plan versions run on
+biomass steam** ("option a and b should operate on biomass"): two 500 kg/h
+biomass modules (or one ~1 t/h package, Getabec class, 6M to 10M THB
+installed with fuel feed, grate and dust control) plus a fuel store and
+handling block (1M to 2M THB, estimate) in the
+[utilities CSV](finance/utilities-investment.csv). The launch plant at
+~850k records burns ~954 MWh of heat a year, about 300 t of air-dry wood
+or ~460 t of fresh chips, ~0.67M THB at 0.7 THB/kWh, against ~4.9M THB a
+year for electric steam with its demand charge (calculator, estimates).
+The electric-first staged path under Decision framing is dropped; the
+electric bank stays the alternative.
+
+The fuel comes from two sources: the team's own 60 rai of currently unused land, and northern
 Thailand's agricultural waste market. Figures below are planning estimates,
 plus or minus a wide margin, to be refined against the actual boiler choice
 and duty cycle.
@@ -165,7 +174,7 @@ storage are additional.
   [grid tariff](sustainability.md#grid-tariff-pea-and-what-it-decides)).
   The electric boiler is the more efficient machine; biomass is the far
   cheaper heat
-- A staged path is possible: start electric (fast, clean permitting), plant
+- (Superseded 17 October 2026: biomass from the launch.) A staged path is possible: start electric (fast, clean permitting), plant
   the coppice now (first harvest in 2 to 4 years), and add the biomass
   boiler at the automated-line expansion when demand and the fuel supply
   have both matured. At the tariff above that is a permitting and logistics

docs/boi.md

@@ -26,7 +26,7 @@ top through the upgrade measures, where this project happens to be strong:
   THB 12M per MW
   ([B Global Law](https://bgloballaw.com/2026/01/18/boi-announcement-no-3-2568-amendment-to-renewable-energy-efficiency-enhancement-measures),
   [Smarter Energy Solution](https://smarterenergysolution.com/blog/boi-solar-thailand-2026),
-  checked October 2026). So owning the ~640 kWp array earns no BOI
+  checked October 2026). So owning the ~520 kWp factory-roof array earns no BOI
   benefit; its case is the bill (see [sustainability](sustainability.md)).
   Whether the 271 kWh battery qualifies is for the BOI consultant. A PPA
   developer selling solar power (200 kW or more per distribution point)

docs/business-plan/build/content_a.py

@@ -29,11 +29,12 @@ def blocks():
              "snapshots at their file dates, not commitments. Every number in this plan is labelled as quoted, "
              "researched, or estimated; see section 2. " + pick(
                  "This version is Plan A: the launch plant with the whole chain, cutting and galvanics "
-                 "included, three presses, brought to ~180M THB (~177M) with six cost levers. A second "
-                 "version, Plan B (~215M THB), builds the same plant and takes none of the levers. ",
+                 "included, three presses, with six cost levers taken: labelled ~180M THB, it comes to "
+                 "~182M at the midpoint, about 2M above 180M. A second version, Plan B (~215M THB), builds "
+                 "the same plant and takes none of the levers. ",
                  "This version is Plan B: the launch plant with the whole chain, cutting and galvanics "
                  "included, three presses, with everything in and none of the cost levers taken, at ~215M "
-                 "THB (~216M). A second version, Plan A (~180M THB), builds the same plant with six cost "
+                 "THB (~217M). A second version, Plan A (~180M THB), builds the same plant with six cost "
                  "levers. ")
              + "The plan price includes the ramp-up reserve and carries no contingency. Cover picture: the "
              "plant as the plant and business plan calculator draws this plan (schematic, Payap scenario "
@@ -84,13 +85,11 @@ def blocks():
             "zero-discharge water treatment, and the Sibert stamper-prep line. The father and the mother of "
             "every side are archived, so represses start from our own metal.",
             "**A modular utility plant:** a boiler hall and a chiller compound built once for four modules "
-            "each, with " + pick(
-                "two 500 kg/h boiler modules (B-1, B-2, bought through the Chinese route) and two 250 kW "
-                "chiller modules (CH-1, CH-2)",
-                "two 500 kg/h boiler modules (B-1, B-2, from Thai suppliers) and two 250 kW chiller modules "
-                "(CH-1, CH-2)")
-            + " installed at launch; further presses add modules, not rooms. The steam fuel (electric or "
-            "biomass) is still open.",
+            "each, with two 500 kg/h biomass boiler modules (B-1, B-2) and two 250 kW chiller modules "
+            "(CH-1, CH-2) installed at launch; further presses add modules, not rooms. **Steam is biomass "
+            "from launch in both versions of this plan**, fired with wood chips from a covered fuel "
+            "store: ~0.67M THB of fuel a year against ~4.9M THB for electric steam (estimates). Electric "
+            "boilers are the alternative, not the plan.",
             pick("**Cassette duplication and CD-R duplication as a growth step** after launch, not in the "
                  "plan price; both fit inside the building programme. ",
                  "**Cassette duplication and CD-R duplication in-house** from launch. ")
@@ -98,10 +97,11 @@ def blocks():
             "(injection-moulded discs) is a separate, much larger decision, outside the totals; both CD "
             "routes are set out in section 4.10 for the investor to decide.",
             "**A purpose-built ~1,500 m² plant on long-term leased land**, with a detached utility yard, "
-            + pick("solar on every roof and canopy (~640 kWp, estimate) through a solar power purchase "
+            + pick("solar on the factory roof (~520 kWp, estimate) through a solar power purchase "
                    "agreement (PPA)",
-                   "owned solar on every roof and canopy (~640 kWp, estimate) with a battery")
-            + " and room for a second building.",
+                   "owned solar on the factory roof (~520 kWp, estimate) with a battery")
+            + ", the office roof and the car and scooter canopies built PV-ready for later panels, and "
+            "room for a second building.",
             "**Open source throughout:** every plant server runs NixOS, declared in one repository in the "
             "fleet B4L already operates, so any machine is rebuilt from it; ERPNext (no licence fee) is the "
             "only system of record; and our own code (the factory console, the plant overview, the artist "
@@ -120,25 +120,28 @@ def blocks():
             "right first; " + pick("the launch plant", "the whole chain at launch")
             + " was decided anyway, and that advice is carried as a risk (sections 11.2 and 13).",
             pick(
-                "**Six cost levers bring the plant to ~180M THB**, from ~201M to ~162M THB at the midpoint "
-                "before the ramp-up reserve (estimates, section 8): solar on every roof and canopy (~640 kWp) "
-                "and the battery through a solar PPA (the installer owns and finances the array, the plant "
-                "buys the power); metrology in two "
-                "steps (XRF, inline vision and the audio station at launch, the laser confocal and the "
+                "**Six cost levers bring the plant to ~182M THB: labelled ~180M, it is about 2M above 180M "
+                "at the midpoint** (177M with the low end of the ramp-up reserve), from ~201.6M to ~167.1M "
+                "THB at the midpoint before the reserve (estimates, section 8): solar on the factory roof "
+                "(~520 kWp) and the battery through a solar PPA (the installer owns and finances the array, "
+                "the plant buys the power); metrology in two steps (XRF, inline vision and the audio "
+                "station at launch, the laser confocal and the "
                 "wide-area profiler bought from revenue); the visitor corridor built later, so no public tours "
                 "at first; cassette and CD-R duplication later; a mobile crane rented for the installations, "
-                "with frame, runway and machine door kept crane-ready; boilers and compressor through the "
-                "Chinese route. Every press, the cutting room, the galvanics line and the stamper-prep line "
-                "stay in.",
-                "**Everything in, none of the cost levers: ~215M THB**, ~201M THB at the midpoint before the "
-                "ramp-up reserve and ~39M THB more than Plan A (estimates, section 8): owned solar on every "
-                "roof and canopy (~640 kWp) and the battery, so no PPA power bill (~2.3M THB a year in Plan "
-                "A, estimate); the full metrology stack from launch (XRF, "
+                "with frame, runway and machine door kept crane-ready; the compressor through the Chinese "
+                "route. Every press, the cutting room, the galvanics line, the stamper-prep line and the "
+                "biomass boilers stay in. The Chinese route priced only electric boilers; a Chinese biomass "
+                "boiler is not yet quoted, and one ~2M THB or more below the Thai package would bring the "
+                "midpoint back to 180M.",
+                "**Everything in, none of the cost levers: ~215M THB** (~217M at the midpoint with the "
+                "ramp-up reserve, ~201.6M THB before it) and ~35M THB more than Plan A (estimates, section "
+                "8): owned solar on the factory roof (~520 kWp) and the battery, so no PPA power bill (~1.9M "
+                "THB a year in Plan A, estimate); the full metrology stack from launch (XRF, "
                 "laser confocal, wide-area profiler, inline vision, audio station); the visitor corridor and "
                 "accessible entrance, so public tours and the Payap student programmes are possible from the "
-                "start; cassette and CD-R duplication; a bought 5 t overhead crane; boilers and compressor "
-                "from Thai suppliers, with local service. Every press, the cutting room, the galvanics line "
-                "and the stamper-prep line are the same as in Plan A."),
+                "start; cassette and CD-R duplication; a bought 5 t overhead crane; the compressor from a "
+                "Thai supplier, with local service. Every press, the cutting room, the galvanics line, the "
+                "stamper-prep line and the biomass boilers are the same as in Plan A."),
         ]),
         H2("What makes it top-notch"),
         P("Four things separate this plant from a pressing shop, and they are the reason it can charge "
@@ -164,14 +167,18 @@ def blocks():
             "press cycle is logged, and sampled records are compared automatically against the source "
             "master.",
             "**Efficiency designed in.** Heat is recovered before energy is generated: in order, a flue-gas "
-            "economiser if the boiler is fired, as much condensate back to the feed tank as possible, then a "
-            "heat pump that lifts the presses' ~60 °C cooling return into boiler feedwater. Every roof and "
-            "canopy carries solar: **~640 kWp** on the Payap scenario layout (factory roof ~523 kWp, "
-            "parking canopies ~54 kWp, office roof ~65 kWp), about 900 MWh a year, of which ~85 % is used "
-            "on site (~760 MWh, ~38 % of the launch plant's electricity with electric steam); the rest is "
-            "curtailed, because a factory on PEA's grid runs zero export and is not paid for surplus "
-            "(estimates). On the Mueang Chi hall the roof and canopies hold ~300 kWp, so the rest would be "
-            "ground-mounted or wait for the second building's roof. A 271 kWh battery gives ride-through"
+            "economiser on the biomass boilers, as much condensate back to the feed tank as possible, then "
+            "a heat pump that lifts the presses' ~60 °C cooling return into boiler feedwater. Solar goes on "
+            "the factory roof: **~520 kWp** on the Payap scenario layout, about 730 to 780 MWh a year, of "
+            "which ~87 % is used on site (~633 MWh, ~61 % of the launch plant's ~1,036 MWh a year of "
+            "electricity); the rest is curtailed, because a factory on PEA's grid runs zero export and is "
+            "not paid for surplus. With biomass steam the running load is ~230 kW, and an hourly sketch "
+            "puts the best array for it at ~500 to 550 kWp, so the factory roof sits at that optimum "
+            "(estimates). The office roof (~65 kWp) and the car and scooter canopies (~54 kWp) are built "
+            "PV-ready (structure rated for panels, conduit to the main board) and take panels when the "
+            "load rises with the second Duplex system: ~120 kWp for ~2.4M to 3.1M THB (estimate). On the "
+            "Mueang Chi hall the factory roof takes ~247 kWp and its canopies are PV-ready too. A 271 kWh "
+            "battery gives ride-through"
             + pick(
                 "; array and battery come through the solar PPA: the installer owns and finances them, the "
                 "plant buys the power. ",
@@ -180,7 +187,8 @@ def blocks():
             "galvanics rinse water goes through a zero-discharge evaporator, and 20% of the feedstock is "
             "in-house regrind. Boilers and chillers come in identical modules, so spares and service are one "
             "routine. At reported northern fuel prices biomass heat costs a quarter to a tenth of electric "
-            "steam; the fuel choice is open.",
+            "steam, which is why steam is biomass from launch: it saves ~4.2M THB (~USD 0.13M) a year "
+            "against electric boilers and keeps the grid demand at ~264 kW instead of ~980 kW (estimates).",
             "**Climate control as product quality.** The whole plant runs at 20 to 26 °C, 35 to 60% "
             "relative humidity, with particulate filtration sized for Northern Thailand's burning season. "
             "Moisture and dust are the two classic causes of noisy records; the plant we visited has "
@@ -197,23 +205,26 @@ def blocks():
                 "at our planning rates). Second Duplex as a growth step from revenue (section 4.4); full hall "
                 "as a later option: ~2.9M to 4.4M")],
             ["Site", "~1,500 m² main building plus a ~379 m² utility yard built for four boiler and four "
-                     "chiller modules, on leased land (~4 rai minimum, 6 to 8 rai with expansion); second "
+                     "chiller modules and a covered biomass fuel store, on leased land (~4 rai minimum, "
+                     "6 to 8 rai with expansion); second "
                      "building as expansion"],
             [pick("Investment, Plan A", "Investment, Plan B"), pick(
-                "**~THB 177M (~USD 5.35M), rounded to ~180M THB**: the plan investment, ~THB 161.7M (~USD "
-                "4.90M) at the midpoint with the six levers taken, plus a ramp-up reserve of ~THB 10M to 20M "
-                "(staff and overheads before volume covers them). From the low to the high end of every "
-                "block: ~THB 127M to 226M. Estimates: no quote yet for the Classic, the galvanics line "
+                "**~THB 182M (~USD 5.52M), labelled ~180M THB**: the plan investment, ~THB 167.1M (~USD "
+                "5.06M) at the midpoint with the six levers taken, plus a ramp-up reserve of ~THB 10M to 20M "
+                "(staff and overheads before volume covers them). **At the midpoint that is about 2M above "
+                "180M**; with the low end of the reserve (~177M) it fits. From the low to the high end of "
+                "every block: ~THB 132M to 233M. Estimates: no quote yet for the Classic, the galvanics line "
                 "(priced at OMS's reference plus 20 %) or the building",
-                "**~THB 216M (~USD 6.53M), rounded to ~215M THB**: the plan investment, ~THB 200.6M (~USD "
-                "6.08M) at the midpoint with everything in, plus a ramp-up reserve of ~THB 10M to 20M (staff "
-                "and overheads before volume covers them); at the midpoint just within the investor's 180M "
-                "THB plus 20 % (216M). From the low to the high end of every block: ~THB 156M to 275M. "
+                "**~THB 217M (~USD 6.56M), labelled ~215M THB**: the plan investment, ~THB 201.6M (~USD "
+                "6.11M) at the midpoint with everything in, plus a ramp-up reserve of ~THB 10M to 20M (staff "
+                "and overheads before volume covers them); at the midpoint ~0.6M above the investor's 180M "
+                "THB plus 20 % (216M), inside 225M. From the low to the high end of every block: ~THB 156M "
+                "to 277M. "
                 "Estimates: no "
                 "quote yet for the Classic, the galvanics line (priced at OMS's reference plus 20 %) or the "
                 "building")],
             ["Not in the plan price", "**No contingency** (at the 15 % used in the cost documents, ~THB "
-                                      + pick("24M", "30M") + " at the midpoint): quotes that land high are "
+                                      + pick("25M", "30M") + " at the midpoint): quotes that land high are "
                                       "funded outside the plan or by scope steps (section 8). Also not in "
                                       "it: the central hydraulic plant (not yet costed), the archive's mobile "
                                       "shelving (to quote), CD replication, financing costs, currency moves, "
@@ -222,24 +233,24 @@ def blocks():
                            "(USD 9k to 30k), section 6.1"],
             ["Operating result, mature year", pick(
                 "Central case at 60 % specials: revenue ~USD 3.65M (~THB 120M), EBITDA ~USD 1.73M (~THB "
-                "57M), operating profit ~USD 1.34M (~THB 44M); break-even on operating profit at ~0.2M "
+                "57M), operating profit ~USD 1.33M (~THB 44M); break-even on operating profit at ~0.2M "
                 "records a year. **The adverse case loses money:** EBITDA ~USD 0.23M, operating loss ~USD "
-                "0.39M (~THB 13M); it would need ~0.9M records a year to cover depreciation and the three "
-                "presses make 0.58M at that rate. The solar PPA's power price (~USD 0.07M a year in the "
+                "0.41M (~THB 14M); it would need ~1.0M records a year to cover depreciation and the three "
+                "presses make 0.58M at that rate. The solar PPA's power price (~USD 0.06M a year in the "
                 "calculator) is not in these figures. Utilisation and price decide the outcome, not upside "
                 "(section 9)",
                 "Central case at 60 % specials: revenue ~USD 3.65M (~THB 120M), EBITDA ~USD 1.73M (~THB "
                 "57M), operating profit ~USD 1.24M (~THB 41M); break-even on operating profit at ~0.24M "
                 "records a year. **The adverse case loses money:** EBITDA ~USD 0.23M, operating loss ~USD "
-                "0.54M (~THB 18M); it would need ~1.1M records a year to cover depreciation and the three "
+                "0.55M (~THB 18M); it would need ~1.1M records a year to cover depreciation and the three "
                 "presses make 0.58M at that rate. Cassette, CD-R and tour revenue are not in these figures. "
                 "Utilisation and price decide the outcome, not upside (section 9)")],
             ["Payback", pick(
-                "~3.1 years on the plan price in the central case (2.2 to 4.0 from the low to the high end of "
-                "the price); ~1.0 year in the favourable case, ~30 years in the adverse case (EBITDA, mature "
+                "~3.2 years on the plan price in the central case (2.3 to 4.1 from the low to the high end of "
+                "the price); ~1.1 years in the favourable case, ~31 years in the adverse case (EBITDA, mature "
                 "year, ramp-up reserve included; estimates)",
-                "~3.8 years on the plan price in the central case (2.7 to 4.8 from the low to the high end of "
-                "the price); ~1.2 years in the favourable case, ~36 years in the adverse case (EBITDA, mature "
+                "~3.8 years on the plan price in the central case (2.7 to 4.9 from the low to the high end of "
+                "the price); ~1.2 years in the favourable case, ~37 years in the adverse case (EBITDA, mature "
                 "year, ramp-up reserve included; estimates)")],
             ["First paying release", "**Open.** The August 2026 calendar gives Q4 2028 to mid-2029 (27 to 33 "
                                      "months from the start of phase 0), but it was drawn for a one-press "
@@ -252,10 +263,11 @@ def blocks():
                        "crew, because two shifts still need press, finishing, galvanics, QC and maintenance "
                        "staff (13 to 19 direct production staff in the revenue model)"],
             ["The ask", pick(
-                "~THB 177M (~USD 5.35M), the ~180M THB plan, released in tranches against milestones "
-                "(section 8), starting with phase 0 (~THB 1.3M to 2.6M). BOI caps debt-to-equity at 3:1, so "
-                "at least a quarter is equity: ~THB 44M (arithmetic, before financing costs)",
-                "~THB 216M (~USD 6.53M), the ~215M THB plan, released in tranches against milestones "
+                "~THB 182M (~USD 5.52M), the plan labelled ~180M THB (about 2M above 180M at the midpoint), "
+                "released in tranches against milestones (section 8), starting with phase 0 (~THB 1.3M to "
+                "2.6M). BOI caps debt-to-equity at 3:1, so at least a quarter is equity: ~THB 46M "
+                "(arithmetic, before financing costs)",
+                "~THB 217M (~USD 6.56M), the ~215M THB plan, released in tranches against milestones "
                 "(section 8), starting with phase 0 (~THB 1.3M to 2.6M). BOI caps debt-to-equity at 3:1, so "
                 "at least a quarter is equity: ~THB 54M (arithmetic, before financing costs)")],
         ]),
@@ -267,12 +279,13 @@ def blocks():
             "presses (one Duplex system and the Classic) and takes six cost levers. ")
           + "Both carry the ramp-up reserve and neither carries a contingency, and in both the second Duplex "
           "system is a growth step from revenue. What decides between them is no longer demand, because both "
-          "make the same records: it is whether the investor funds ~THB 39M (~22 %) more at launch for what "
+          "make the same records: it is whether the investor funds ~THB 35M (~19 %) more at launch for what "
           "Plan A leases or buys from revenue. Plan B owns its solar array (no PPA power bill), measures "
           "every stamper fully from the first release, makes tours and the Payap "
           "programmes possible from the start, sells cassette and CD-R from launch, owns its crane and buys "
-          "its utilities with local service. On the modelled numbers that extra earns little (the same "
-          "EBITDA in the revenue model, ~USD 0.07M a year more in the calculator for the PPA power bill the "
+          "its compressor with local service; both run on biomass steam. On the modelled numbers that extra "
+          "earns little (the same EBITDA in the revenue model, ~USD 0.06M a year more in the calculator for "
+          "the PPA power bill the "
           "owned array avoids; more depreciation, a longer payback, a deeper adverse case), so Plan A has "
           "the better modelled return and Plan B the more complete plant. Most of Plan B's items can be added to Plan A "
           "later from revenue; the corridor is cheaper to build in from the start, and owning the array "
@@ -280,27 +293,31 @@ def blocks():
           "2025, section 7.1), so neither plan earns a tax benefit on the array. "
           "Section 8 sets the two side by side."),
         T(["", "Plan A", "Plan B"], [
-            ["Plan price (ramp-up reserve in, no contingency)", "~THB 177M (~USD 5.35M); ~127M to 226M from "
-             "the low to the high end", "~THB 216M (~USD 6.53M); ~156M to 275M from the low to the high end"],
+            ["Plan price (ramp-up reserve in, no contingency)", "~THB 182M (~USD 5.52M), ~2M above 180M at "
+             "the midpoint; ~132M to 233M from the low to the high end", "~THB 217M (~USD 6.56M); ~156M to "
+             "277M from the low to the high end"],
             ["Presses", "3: one Duplex system (2 semi-automatic) and one Classic", "The same 3"],
             ["Records a year at 60 % specials", "~0.58M to 0.90M (central 0.74M)", "The same"],
+            ["Steam", "Biomass from launch: two 500 kg/h modules and a covered fuel store", "The same"],
             ["EBITDA, central case", "~USD 1.73M (~THB 57M)", "~USD 1.73M (~THB 57M); cassette and CD-R "
                                                               "not modelled"],
-            ["Operating profit, central case", "~USD 1.34M (~THB 44M)", "~USD 1.24M (~THB 41M)"],
-            ["Payback on the plan price, central case", "~3.1 years (2.2 to 4.0)", "~3.8 years (2.7 to 4.8)"],
-            ["Adverse case", "Loses money: EBITDA ~USD 0.23M, operating loss ~USD 0.39M",
-             "Loses money: EBITDA ~USD 0.23M, operating loss ~USD 0.54M"],
+            ["Operating profit, central case", "~USD 1.33M (~THB 44M)", "~USD 1.24M (~THB 41M)"],
+            ["Payback on the plan price, central case", "~3.2 years (2.3 to 4.1)", "~3.8 years (2.7 to 4.9)"],
+            ["Adverse case", "Loses money: EBITDA ~USD 0.23M, operating loss ~USD 0.41M",
+             "Loses money: EBITDA ~USD 0.23M, operating loss ~USD 0.55M"],
             ["What Plan A gives up, what Plan B buys", "At launch: solar through a PPA (a power bill of "
-             "~USD 0.07M a year instead of owning the array), no confocal or profiler, no visitor corridor "
-             "or tours, no cassette or CD-R, a rented crane; Chinese-made boilers and compressor",
-             "~THB 39M more at launch: owned solar (~640 kWp, every roof and canopy covered) and battery, "
+             "~USD 0.06M a year instead of owning the array), no confocal or profiler, no visitor corridor "
+             "or tours, no cassette or CD-R, a rented crane; a Chinese-made compressor",
+             "~THB 35M more at launch: owned solar (~520 kWp on the factory roof) and battery, "
              "so no PPA bill, the full "
              "metrology stack, the visitor corridor and tours, cassette and CD-R, a bought crane; "
-             "Thai-supplied boilers and compressor"],
+             "a Thai-supplied compressor"],
         ], widths_mm=[42, 64, 64], font_pt=8.5,
            caption="Estimates: mature year at 60 % specials, from the revenue model; payback counted on the "
                    "whole plan price including the reserve. A central EBITDA margin of ~47 % (both plans) is "
-                   "far above the 15 to 25 % pressing plants earn; read the adverse case as the honest one."),
+                   "far above the 15 to 25 % pressing plants earn; read the adverse case as the honest one. "
+                   "The revenue model does not split energy cost by plan or fuel, so the PPA bill and the "
+                   "biomass saving show only in the calculator."),
         H2("Where we are, and what we ask"),
         P("The project is at the planning stage. Industry outreach has run for several years. Alexander and "
           "Simona attended **Making Vinyl Europe in Haarlem** (30 September to 2 October 2026): most people "
@@ -326,31 +343,34 @@ def blocks():
             "of the investment band: " + pick(
                 "the Newbilt re-quote for the Duplex system (with an EX 35 price) and the Classic, a Pheenix "
                 "quote for the galvanics line, the building price request with the soil test, metrology "
-                "distributor quotes and a solar PPA offer.",
+                "distributor quotes, a solar PPA offer and a Chinese biomass-boiler quote (one ~2M THB or "
+                "more below the Thai package brings Plan A's midpoint back to 180M).",
                 "the Newbilt re-quote for the Duplex system (with an EX 35 price) and the Classic, a Pheenix "
                 "quote for the galvanics line, the building price request with the soil test, and metrology "
                 "distributor quotes."),
             pick(
-                "**Then the Plan A round, ~THB 177M (~USD 5.35M), rounded to ~180M THB**, including the "
+                "**Then the Plan A round, ~THB 182M (~USD 5.52M), labelled ~180M THB**, about 2M above 180M "
+                "at the midpoint, including the "
                 "ramp-up reserve and without contingency, released in tranches against milestones: BOI "
                 "certificate and lease signed, long-lead orders (lathe, galvanics, stamper prep, presses, "
                 "boiler and chiller modules), building contract, fit-out, commissioning in sequence "
-                "(section 8). From the low to the high end of every block the plan runs from ~THB 127M to "
-                "226M; quotes that land high are funded outside the plan or by scope steps.",
-                "**Then the Plan B round, ~THB 216M (~USD 6.53M), rounded to ~215M THB**, including the "
-                "ramp-up reserve and without contingency, just within the investor's 180M THB plus 20 % "
-                "(216M) at the midpoint, released in tranches against milestones: BOI certificate and lease signed, "
+                "(section 8). From the low to the high end of every block the plan runs from ~THB 132M to "
+                "233M; quotes that land high are funded outside the plan or by scope steps.",
+                "**Then the Plan B round, ~THB 217M (~USD 6.56M), labelled ~215M THB**, including the "
+                "ramp-up reserve and without contingency, at the midpoint ~0.6M above the investor's 180M "
+                "THB plus 20 % (216M) and inside 225M, released in tranches against milestones: BOI "
+                "certificate and lease signed, "
                 "long-lead orders (lathe, galvanics, stamper prep, presses, boiler and chiller modules), "
                 "building contract, fit-out, commissioning in sequence (section 8). From the low to the high "
-                "end of every block the plan runs from ~THB 156M to 275M; quotes that land high are funded "
+                "end of every block the plan runs from ~THB 156M to 277M; quotes that land high are funded "
                 "outside the plan or by scope steps."),
             "**Decisions needed from the investor:** which version to fund, Plan A or Plan B (both make the "
-            "same records, so the choice is ~THB 39M more at launch for what Plan A leases or defers; the "
+            "same records, so the choice is ~THB 35M more at launch for what Plan A leases or defers; the "
             "Classic, Pheenix and EX 35 quotes, the solar PPA offer and the building quote settle the "
             "numbers); the equity/debt mix (BOI requires debt-to-equity of at most 3:1, so at "
-            "least ~THB " + pick("44M of Plan A's ~177M", "54M of Plan B's ~216M") + " is equity); CD "
-            "replication, yes or no (it must be in the BOI application from the start); and the steam fuel, "
-            "electric or biomass.",
+            "least ~THB " + pick("46M of Plan A's ~182M", "54M of Plan B's ~217M") + " is equity); and CD "
+            "replication, yes or no (it must be in the BOI application from the start). The steam fuel is "
+            "no longer open: both versions run on biomass steam from launch.",
             "**Co-investment:** Ploy Printing, the Chiang Mai print and packaging house that will produce "
             "the plant's jackets and sleeves, has expressed the intention to invest alongside the lead "
             "investor. Terms are not yet discussed; the intended structure is described in section 12.",
@@ -536,9 +556,8 @@ def blocks():
              "Newbilt Duplex system (2 presses, main + colour extruder) and one Newbilt Classic",
              pick("Launch plant; second Duplex as growth option", "At launch; second Duplex as growth option")],
             ["Steam, cooling and compressed air engineered locally", "The largest energy loads; efficiency "
-             "lives here", "Boiler hall and chiller compound for four modules each; " + pick(
-                 "2 x 500 kg/h boilers (Chinese route) and 2 x 250 kW chillers",
-                 "2 x 500 kg/h boilers (Thai suppliers) and 2 x 250 kW chillers") + "; heat recovery designed in",
+             "lives here", "Boiler hall and chiller compound for four modules each; 2 x 500 kg/h biomass "
+                           "boilers with a covered fuel store and 2 x 250 kW chillers; heat recovery designed in",
              LP + "; modules added with presses"],
             ["Whole-plant climate and particulate control", "Moisture and dust are the two classic record "
              "defects", "20 to 26 °C, 35 to 60% RH, filtration for the burning season, tighter in clean "
@@ -566,10 +585,11 @@ def blocks():
              "mobile shelving (to quote)", LP],
             ["Renewable energy and closed-loop water", "Cost, resilience, brand" + pick(
                 "", "; the owned battery may qualify for BOI as storage"),
-             pick("PV on every roof and canopy (~640 kWp) and a 271 kWh battery through a solar PPA "
-                  "(installer-owned), closed cooling loop, zero process discharge",
-                  "PV on every roof and canopy (~640 kWp) and a 271 kWh battery (owned), closed cooling "
-                  "loop, zero process discharge"),
+             pick("PV on the factory roof (~520 kWp; office roof and canopies PV-ready) and a 271 kWh "
+                  "battery through a solar PPA (installer-owned), biomass steam, closed cooling loop, zero "
+                  "process discharge",
+                  "PV on the factory roof (~520 kWp; office roof and canopies PV-ready) and a 271 kWh "
+                  "battery (owned), biomass steam, closed cooling loop, zero process discharge"),
              pick("Launch plant (PV and battery through a solar PPA)", "At launch")],
             ["Trained people and a safety program", "Steam at 10 bar, hydraulics at 180 bar, plating "
              "chemistry", "Vendor commissioning training, in-house program, PPE, clean rooms",
@@ -721,23 +741,19 @@ def blocks():
         P("The Pheenix Alpha AD12 automatic press left the plan in October 2026 and stays the comparison if "
           "the Classic re-quote disappoints."),
         P("**What Newbilt deliberately excludes**, and what is engineered and sourced locally: steam and "
-          "cooling. " + pick(
-              "At Newbilt's per-machine figures the three presses draw about 450 to 540 kg/h of steam "
-              "at 10 bar / 180 °C and up to ~390 kW of cooling on a hot afternoon (estimates; the Classic is "
-              "counted as one press and extruder until Newbilt states its own figures). They are met by **two "
-              "500 kg/h boiler modules (B-1, B-2) and two 250 kW chiller modules (CH-1, CH-2)**, in a boiler "
-              "hall and an open chiller compound built for four modules each; a second Duplex adds a third "
-              "chiller module, and the fourth positions are reserve and growth. Plan A buys the two boiler "
-              "modules through the Chinese route: ASME-stamped 1.25 MPa units from makers with Thai "
-              "references, installed by a Thai contractor and verified under the Thai rules for imported "
-              "boilers (section 5.4). ",
-              "At Newbilt's per-machine figures the three presses draw about 450 to 540 kg/h of steam "
-              "at 10 bar / 180 °C and up to ~390 kW of cooling on a hot afternoon (estimates; the Classic is "
-              "counted as one press and extruder until Newbilt states its own figures). They are met by **two "
-              "500 kg/h boiler modules (B-1, B-2) and two 250 kW chiller modules (CH-1, CH-2)**, in a boiler "
-              "hall and an open chiller compound built for four modules each; a second Duplex adds a third "
-              "chiller module, and the fourth positions are reserve and growth. Plan B buys the boiler "
-              "modules and the compressor from Thai suppliers, with local service. ")
+          "cooling. At Newbilt's per-machine figures the three presses draw about 450 to 540 kg/h of steam "
+          "at 10 bar / 180 °C and up to ~390 kW of cooling on a hot afternoon (estimates; the Classic is "
+          "counted as one press and extruder until Newbilt states its own figures). They are met by **two "
+          "500 kg/h biomass boiler modules (B-1, B-2) and two 250 kW chiller modules (CH-1, CH-2)**, in a "
+          "boiler hall and an open chiller compound built for four modules each; a second Duplex adds a "
+          "third chiller module, and the fourth positions are reserve and growth. The boilers burn wood "
+          "chips from a covered fuel store, in both versions of the plan: ~6M to 10M THB installed with "
+          "fuel feed, grate and dust control, plus ~1M to 2M THB for the fuel store and handling, and "
+          "~0.67M THB of fuel a year (estimates). " + pick(
+              "Plan A buys the compressor through the Chinese route. That route priced only electric "
+              "boilers; Chinese makers also build biomass boilers but none is priced yet, and a quote ~2M "
+              "THB or more below the Thai package would bring Plan A's midpoint back to 180M (section 5.4). ",
+              "Plan B buys the compressor from a Thai supplier, with local service. ")
           + "The presses share one central hydraulic plant and one "
           "compressed-air plant through ring mains with a valved tee at every press position, so a new press "
           "is connected without stopping the others; the standby pump set, accumulators and ring main are "

docs/business-plan/build/content_b.py

@@ -279,23 +279,20 @@ def blocks():
           "one observation: the steam's job is to heat the moulds and the cooling water's job is to remove "
           "that same heat again. Roughly 98% of the press cooling load is heat the steam put into the "
           "moulds, and the press cooling return leaves at about 60 °C. That warm return, the condensate and "
-          "a fired boiler's flue gas are heat the plant reuses before it generates anything new."),
+          "the biomass boilers' flue gas are heat the plant reuses before it generates anything new."),
         H3("Utilities: backbone once, modules with the presses"),
         P("Everything that is cheap to oversize now and costly to change in a running plant is built once, "
           "for the five-press fleet: the boiler hall and the chiller compound with room for four modules "
           "each, the steam main and condensate return, the cooling mains, the heat-exchanger frame and "
           "tanks, and hydraulic and compressed-air ring mains with a valved, capped tee at every press "
-          "position. The machines that make steam and cold water come in identical modules: " + pick(
-              "at launch two 500 kg/h boilers (B-1, B-2) for the 450 to 540 kg/h peak and two 250 kW "
-              "air-cooled chillers rated at 40 °C ambient (CH-1, CH-2) for ~391.5 kW, sequenced lead and "
-              "lag by one controller. Either boiler alone carries 93 to 111% of the steam demand; one "
-              "chiller out leaves ~64% of the cooling peak. The boiler bodies come through the Chinese "
-              "route and the compressor from a Chinese brand's Thai office (below). ",
-              "at launch two 500 kg/h boilers (B-1, B-2) for the 450 to 540 kg/h peak and two 250 kW "
-              "air-cooled chillers rated at 40 °C ambient (CH-1, CH-2) for ~391.5 kW, sequenced lead and "
-              "lag by one controller. Either boiler alone carries 93 to 111% of the steam demand; one "
-              "chiller out leaves ~64% of the cooling peak. The boilers and the compressor come from Thai "
-              "suppliers, with local service (below). ") +
+          "position. The machines that make steam and cold water come in identical modules: at launch "
+          "two 500 kg/h biomass boilers (B-1, B-2) for the 450 to 540 kg/h peak (one ~1 t/h package is "
+          "the alternative) and two 250 kW air-cooled chillers rated at 40 °C ambient (CH-1, CH-2) for "
+          "~391.5 kW, sequenced lead and lag by one controller. Either boiler alone carries 93 to 111% of "
+          "the steam demand; one chiller out leaves ~64% of the cooling peak. Both plans make their steam "
+          "from biomass (below); " + pick(
+              "the boilers come from a Thai maker and the compressor from a Chinese brand's Thai office. ",
+              "the boilers and the compressor come from Thai suppliers, with local service. ") +
           "Identical modules mean one set of spares "
           "and one service routine, N+1 later is one more module rather than a redesign, and the plant "
           "never runs one oversized boiler at poor part load. Four boilers carry about eight presses with "
@@ -305,7 +302,7 @@ def blocks():
           "station, ring main) is not costed yet; a Thai hydraulic power unit builder quotes it."),
         T(["Measure", "What it does", "Effect"], [
             ["1. Flue-gas economizer (fired boilers)", "Recovers stack heat into the boiler feedwater; the "
-             "first measure to investigate on a biomass or LPG bank (an electric boiler has no flue gas)",
+             "first measure to investigate on the biomass bank (an electric boiler has no flue gas)",
              "Outlet and stack temperatures are vendor figures; rice-husk ash is abrasive, so the RFQ asks "
              "for cleaning, wear protection and a bypass"],
             ["2. Condensate return", "As much clean, hot condensate back to the feed tank as possible",
@@ -344,14 +341,15 @@ def blocks():
           "weekdays) and 2.6037 THB/kWh off-peak, plus the Ft fuel adjustment (+0.1623 THB/kWh for "
           "September to December 2026; it resets every four months) and reclaimable VAT. Two shifts put "
           "about two thirds of process energy into peak hours: a blended ~3.81 THB/kWh before the demand "
-          "charge. For the five-press fleet the backbone is built for" +
-          ", without electric steam, that is "
-          "roughly 4.5M to 6.8M THB a year before solar, 0.7M to 1.1M of it demand charge (estimates), on "
-          "an 800 to 1,000 kVA connection. Three design consequences:"),
+          "charge. For the five-press fleet the backbone is built for, on biomass steam with no electric "
+          "boiler on the grid, that is roughly 4.5M to 6.8M THB a year before solar, 0.7M to 1.1M of it "
+          "demand charge, on an 800 to 1,000 kVA connection; the launch plant's peak demand is ~264 kW, "
+          "against ~980 kW had its steam been electric (estimates). Three design consequences:"),
         B([
-            "**Biomass heat is far cheaper than electric steam** (below): the demand charge follows the "
-            "boiler's full-power draw, and the peak window covers 13 of the 16 production hours.",
-            "**Every roof gets PV, not solar thermal.** Self-consumed PV is worth ~3.7 THB/kWh" + pick(
+            "**Steam comes from biomass in both plans,** because biomass heat is far cheaper than "
+            "electric steam (below): an electric boiler's full-power draw would set the demand charge, and "
+            "the peak window covers 13 of the 16 production hours.",
+            "**The factory roof gets PV, not solar thermal.** Self-consumed PV is worth ~3.7 THB/kWh" + pick(
                 " of grid power displaced, less the PPA price the plant pays for it (below)", "") +
             "; surplus earns nothing, because a factory on PEA's grid runs zero export (below); and PV "
             "cannot lower the demand charge, because the peak window runs to 22:00, long after sunset.",
@@ -361,37 +359,47 @@ def blocks():
         ]),
         H3("Renewable energy"),
         KV([
-            ["PV on every roof and canopy", "~640 kWp (decided October 2026: as much roof as possible). In "
-                                            "the Payap scenario model the calculator draws the factory roof "
-                                            "at ~523 kWp (901 modules of a generic 580 W placeholder; no "
-                                            "module chosen yet), the car and scooter canopies at ~54 kWp and "
-                                            "the office roof at ~65 kWp; the covered link and the utility "
-                                            "yard are left out. ~900 MWh a year at 1,400 to 1,500 kWh/kWp, "
-                                            "~85% of it used on site (~760 MWh: two shifts on 300 days, a "
-                                            "~60 kW base load off-shift and the battery), about 38% of the "
-                                            "launch plant's ~2,000 MWh a year with electric steam "
-                                            "(estimates). " + pick(
+            ["PV on the factory roof", "~520 kWp (decided October 2026: PV on the factory only, the other "
+                                       "roofs PV-ready). In the Payap scenario model the calculator draws "
+                                       "the factory roof at ~523 kWp (901 modules of a generic 580 W "
+                                       "placeholder; no module chosen yet). ~730 to 780 MWh a year at "
+                                       "1,400 to 1,500 kWh/kWp, ~87% of it used on site (~633 MWh: two "
+                                       "shifts on 300 days, a ~60 kW base load off-shift and the "
+                                       "battery), about 61% of the launch plant's ~1,036 MWh a year of "
+                                       "electricity with biomass steam (estimates). " + pick(
                 "Taken through a solar PPA (below): the plant pays the PPA price for this power instead of "
                 "buying the array, so its saving is the gap between that price and the ~3.7 THB/kWh of "
                 "grid power it displaces",
-                "Saves ~2.8M to 3.0M THB a year at ~3.7 THB/kWh self-consumed and pays back in ~4.2 to 5.9 "
-                "years at 20 to 26 THB/W installed; the last ~340 kWp beyond the first ~300 pay back in "
-                "~4.9 to 6.3 years, because more of their yield is curtailed on Sundays (estimates)")],
-            ["Zero export", "The ~15% the plant cannot use, mostly on Sundays and holidays, is curtailed, not "
+                "Saves ~2.3M to 2.5M THB a year at ~3.7 THB/kWh self-consumed and pays back in ~4.1 to 5.8 "
+                "years at 20 to 26 THB/W installed (estimates)")],
+            ["Why ~520 kWp", "With biomass steam the running load is ~230 kW, with no electric boilers. An "
+                             "hourly sketch (two shifts on 300 days, ~60 kW off-shift base load, the 271 kWh "
+                             "battery, PEA's time-of-use tariff with Ft, 23,000 THB/kWp, 25 years at 8%) "
+                             "puts the best array at ~500 to 550 kWp: the net present value peaks there, and "
+                             "the kWp above ~550 lose money because more of their yield is curtailed. The "
+                             "factory roof's ~520 kWp sits at that optimum (estimates)"],
+            ["PV-ready: office roof and canopies", "The office roof (~65 kWp) and the car and scooter canopies "
+             "(~54 kWp: car ~42, scooter ~13) are built ready for panels: structure rated for them (~20 kg/m² "
+             "plus wind uplift), conduit and a cable route to the main board, and a spare way for a later "
+             "inverter. Panels go on when the load rises with the second Duplex system: ~120 kWp for ~2.4M "
+             "to 3.1M THB at 20 to 26 THB/W (estimate). The preparation is small (estimate) and sits in the "
+             "building and site works; the construction RFQ already specifies canopy steel carrying PV"],
+            ["Zero export", "The ~13% the plant cannot use, mostly on Sundays and holidays, is curtailed, not "
                             "sold: a factory on PEA's grid runs zero export, with no payment for surplus and "
                             "a zero-export controller (reverse-power relay) as part of the interconnection "
                             "(CapSolar and Sahawatthanakit, 2026)"],
-            ["On the Mueang Chi hall", "The 60 × 25 m hall of section 6.2 takes only ~300 kWp: ~247 kWp on "
-                                       "the 1,523 m² monopitch roof (425 modules) and ~40 to 54 kWp on the "
-                                       "parking canopies. The rest would need ground mount on the ~70 m of "
-                                       "plot behind the building (not covered by the rooftop exemption, so "
-                                       "it may still need a factory permit) or the phase 2 roof (~251 "
-                                       "kWp)"],
+            ["On the Mueang Chi hall", "The factory roof of the 60 × 25 m hall of section 6.2 takes only "
+                                       "~247 kWp (425 modules on the 1,523 m² monopitch roof), about half "
+                                       "the optimum; its parking canopies are PV-ready too (~40 to 54 kWp). "
+                                       "More would need ground mount on the ~70 m of plot behind the "
+                                       "building (not covered by the rooftop exemption, so it may still "
+                                       "need a factory permit) or the phase 2 roof (~251 kWp)"],
             ["Battery", "271 kWh Gobel Power LiFePO4 rack (15 stacked 18 kWh packs, 8,000+ cycles), USD "
                         "39,900 to 58,000 listed (battery only; ~2.0M to 3.5M THB installed with enclosure, fire protection and "
                         "controls, estimate), 50 to 60 day lead. Roughly an hour of the chiller bank's "
                         "peak draw: ride-through, not off-grid autonomy"],
-            ["Inverters", "Deye three-phase hybrid units (30 to 80 kW class), ~500 kVA in all (estimate); "
+            ["Inverters", "Deye three-phase hybrid units (30 to 80 kW class), ~430 kVA in all (about nine 50 kW "
+                          "units, estimate); "
                           "Thai distribution via Solar Nicolo; Deye is a supported protocol on the Gobel "
                           "battery management"],
             ["Roof design", "Monopitch at 10° falling toward ESE puts the whole roof on one plane at ~98% "
@@ -400,7 +408,7 @@ def blocks():
                             "burning-season dust"],
             ["Permits", "Since Ministerial Regulation No. 3 B.E. 2567 (in force 28 December 2024) rooftop "
                         "solar outside industrial estates is not a factory, so it needs no Ror.Ngor. 4 "
-                        "licence at any size. At ~500 kVA of inverters, under the 1,000 kVA line of the "
+                        "licence at any size. At ~430 kVA of inverters, under the 1,000 kVA line of the "
                         "Energy Regulatory Commission (ERC), an ERC exemption notification replaces a "
                         "generation licence. PEA approves the interconnection with zero-export control in 3 "
                         "to 6 months, filed in parallel with procurement (CapSolar, 2026); the roof load is "
@@ -410,12 +418,13 @@ def blocks():
                             "against PVGIS before committing" + pick("; the PPA offer itself, price and "
                                                                      "terms", "")],
             pick(["Solar PPA (this plan)", "An installer owns and finances the PV and the battery, and the "
-                  "plant buys the power at a price still to quote. The PPA covers the full ~640 kWp; the "
-                  "calculator carries 3.0 THB/kWh (estimate) for the ~760 MWh used on site, ~2.3M THB or "
-                  "~0.07M USD a year on the energy line. That keeps the PV EPC (USD 388k to 504k, 12.8M to "
-                  "16.6M THB at 20 to 26 THB/W) and the battery (USD 61k to 106k) out of the capital round: "
-                  "~17.5M THB less at the midpoint, one of the six levers in section 8. The launch plant's "
-                  "power bill (~0.75M THB a month before solar, estimate) is well above the 100,000 THB a "
+                  "plant buys the power at a price still to quote. The PPA covers the ~520 kWp factory "
+                  "roof; the calculator carries 3.0 THB/kWh (estimate) for the ~633 MWh used on site, ~1.9M "
+                  "THB or ~0.06M USD a year on the energy line. That keeps the PV EPC (USD 315k to 410k, "
+                  "10.4M to 13.5M THB at 20 to 26 THB/W) and the battery (USD 61k to 106k) out of the capital "
+                  "round: ~14.7M THB less at the midpoint, one of the six levers in section 8. The launch "
+                  "plant's power bill (~0.36M THB a month before solar with biomass steam: ~1,036 MWh at the "
+                  "blended ~3.81 THB/kWh plus the demand charge, estimate) is well above the 100,000 THB a "
                   "month CapSolar asks of a PPA site; PPA discounts run 10 to 15 % off the tariff at MEAei "
                   "and 10 to 30 % at CapSolar, so the calculator's ~21 % is to be quoted. Leasing gives up no BOI benefit on the array: BOI stopped promoting solar "
                   "installations on 1 July 2025 (Announcement 3/2568, section 7.1). A PPA developer selling "
@@ -424,77 +433,94 @@ def blocks():
                   "above and, if the PPA includes the battery, the battery's possible BOI eligibility as "
                   "storage (to confirm with the BOI consultant). The PPA offer is asked against the "
                   "specification above"],
-                 ["Owned (this plan)", "The plant buys the array and the battery: PV EPC USD 388k to 504k "
-                  "(12.8M to 16.6M THB for ~640 kWp, 20 to 26 THB/W installed with inverters at Thai 2026 "
-                  "market prices; the canopy steel is in the building and site works) and the battery, "
-                  "installed, USD 61k to 106k (2.0M to 3.5M THB): ~17.5M THB together at the midpoint, "
-                  "estimates, section 8. Owning them saves the power bill a PPA would carry: at the "
-                  "calculator's 3.0 THB/kWh (estimate, to quote) for the ~760 MWh used on site, ~2.3M THB "
-                  "or ~0.07M USD a year. A solar PPA (an installer owns and finances them, the plant buys "
-                  "the power at a price still to quote) would take ~17.5M THB out of the capital round at "
-                  "the midpoint at the cost of that bill. The array itself carries no BOI benefit: BOI "
+                 ["Owned (this plan)", "The plant buys the array and the battery: PV EPC USD 315k to 410k "
+                  "(10.4M to 13.5M THB for ~520 kWp on the factory roof, 20 to 26 THB/W installed with "
+                  "inverters at Thai 2026 market prices; the PV-ready canopy steel and conduit are in the "
+                  "building and site works) and the battery, installed, USD 61k to 106k (2.0M to 3.5M THB): "
+                  "~14.7M THB together at the midpoint, estimates, section 8. Owning them saves the power bill "
+                  "a PPA would carry: at the calculator's 3.0 THB/kWh (estimate, to quote) for the ~633 MWh "
+                  "used on site, ~1.9M THB or ~0.06M USD a year. A solar PPA (an installer owns and finances "
+                  "them, the plant buys the power at a price still to quote) would take ~14.7M THB out of the "
+                  "capital round at the midpoint at the cost of that bill. The array itself carries no BOI benefit: BOI "
                   "stopped promoting solar installations on 1 July 2025 (Announcement 3/2568, section "
                   "7.1); the owned battery may still qualify as storage (to confirm with the BOI "
                   "consultant)"]),
         ]),
-        H3("Steam: the open engineering choice"),
-        P("The boilers' fuel is still open; the modular bank works with either. There is no natural gas "
-          "pipeline in Northern Thailand, so gas means a bulk LPG tank on site with hazardous-storage "
-          "separation and licensing, and diesel means a fuel tank with price exposure. The two routes "
-          "without a fossil tank, compared for the same heat (~1,120 to 1,280 MWh a year at about 1.0 "
-          "million records, the top of the plant's range; estimates):"),
-        T(["", "Electric boiler bank (~98%)", "Biomass boiler bank (~80%)"], [
-            ["Price of heat", "~3.9 THB/kWh, plus the demand charge", "~0.5 to 0.9 THB/kWh at 1.35 to 2 "
-             "THB/kg delivered (reported market prices, October 2026; no supplier quote yet)"],
-            ["Running cost, mature two shifts", "~5.2M to 6.0M THB a year, including 0.8M to 1.0M of extra "
-             "demand charge for the five-press bank", "~0.6M to 1.2M THB a year of fuel, plus handling "
-                                                      "and ash"],
-            ["Boiler package, 2 × 500 kg/h", pick("~2.8M to 5.5M THB through the Chinese route, the "
-                                                  "plan's price (4.5M to 7M from Thai suppliers)",
-                                                  "4.5M to 7M THB (Thai suppliers); the plan's price"),
-             "~6M to 10M THB, plus the fuel store"],
-            ["Grid", "Peak ~950 to 1,330 kW: PEA Schedule 4, 1,250 to 1,600 kVA", "Unchanged, ~800 to "
-                                                                              "1,000 kVA"],
-            ["Also", "Cleanest permitting, no fuel logistics, no stack", "Fuel contracts, a dry store sized "
-             "for the monsoon, ash handling, a 14 m stack and its emissions"],
-        ], widths_mm=[36, 64, 70], font_pt=8.5),
+        H3("Steam: biomass in both plans"),
+        P("Both plans make their steam from biomass (decided October 2026): two 500 kg/h biomass modules "
+          "(B-1, B-2) or one ~1 t/h package, Getabec class, 6M to 10M THB installed with the fuel feed, "
+          "grate and dust control, plus a fuel store and handling block of 1.0M to 2.0M THB (a covered "
+          "store, a chip bay, ash bins and a compact loader; utilities CSV, estimates). The electric boiler "
+          "bank (4.5M to 7M THB from Thai suppliers, 2.8M to 5.5M through the Chinese route) is now the "
+          "alternative, not the plan. There is no natural gas pipeline in Northern Thailand, so gas would "
+          "mean a bulk LPG tank on site with hazardous-storage separation and licensing, and diesel a fuel "
+          "tank with price exposure. The two routes without a fossil tank, compared for the launch plant "
+          "at ~850k records a year (~1,403 t of steam, ~954 MWh of heat; estimates):"),
+        T(["", "Biomass boiler bank (~80%): the plan", "Electric boiler bank (~98%): the alternative"], [
+            ["Price of heat", "~0.5 to 0.9 THB/kWh at 1.35 to 2 THB/kg delivered (reported market prices, "
+             "October 2026; no supplier quote yet), ~0.7 planned", "~3.9 THB/kWh, plus the demand charge"],
+            ["Running cost, launch plant", "~0.67M THB a year of fuel at ~0.7 THB/kWh: about 300 t of "
+             "air-dry wood or ~460 t of fresh chips, plus handling and ash", "~4.9M THB a year: ~973 MWh at "
+             "the blended ~3.81 THB/kWh plus the demand charge on 2 × 360 kW of boilers"],
+            ["Boiler package, 2 × 500 kg/h", "~6M to 10M THB installed, plus 1.0M to 2.0M for the fuel "
+             "store and handling", "4.5M to 7M THB from Thai suppliers, ~2.8M to 5.5M through the Chinese "
+             "route"],
+            ["Grid", "Launch plant peak demand ~264 kW; 800 to 1,000 kVA for the five-press backbone",
+             "~980 kW at launch; the five presses ~950 to 1,330 kW, PEA Schedule 4, 1,250 to 1,600 kVA"],
+            ["Also", "Fuel contracts and a monsoon stock, ash handling, a 14 m flue stack with a dust "
+             "collector, more maintenance, a certified boiler attendant, emission limits in the permit",
+             "Cleanest permitting, no fuel logistics, no stack"],
+        ], widths_mm=[32, 70, 68], font_pt=8.5),
         P("**Reading it.** The electric boiler is the more efficient machine; biomass is by far the cheaper "
-          "heat. At maturity the fuel saving of ~4.0M to 5.4M THB a year repays the biomass premium in "
-          "under a year (estimate), so the earlier staged path (start electric, add biomass later) is a "
-          "permitting and fuel-logistics choice, not a cost one: every year on electric steam costs roughly "
-          "1.4M to 5.4M THB more. The site can decide it too: next to the pharmaceutical facility on Payap "
-          "land a biomass stack would be a hard sell, which favours electric or LPG there (section 6.1)."),
-        P("**Fuel.** A biomass bank burns roughly 350 to 400 tonnes of air-dry wood a year at about 1.0 "
-          "million records (~540 to 620 t as fresh chips, which is what the store and the monsoon stock are "
-          "sized for). Lamphun alone produces more than 900,000 t of farm residues a year (Maejo "
-          "University), so supply is not the constraint; price is. Reported prices follow diesel, so the "
-          "fuel contract gets a diesel clause and sources within ~50 km. The local price-setter is Ratch "
-          "Pathana's biomass buying centre at Pa Sak, Mueang Lamphun, which feeds a 9.6 MW cogeneration "
-          "plant and competes for the same fuel. The team's own 60 rai of forestry-classified land could "
-          "supply 80 to 135 t a year as short-rotation coppice once its title is checked; at market prices "
-          "that is worth only ~0.1M to 0.25M THB a year, so its value is supply security and the story "
-          "('records pressed with steam from our own trees'), not the fuel bill. Next step: written quotes "
-          "from Pa Sak and two or three chip suppliers, priced by moisture, before the boiler decision."),
-        P("**Where the boilers come from.** " + pick(
-              "The plan buys the two modules through the Chinese route: boiler bodies from a Chinese maker "
-              "with Thai references (ZOZEN, Sitong, Fangkuai, Taiguo), installed with the feed tank, pumps, "
-              "header, controls and piping by a Thai boiler contractor, for roughly 2.8M to 5.5M THB "
-              "installed against 4.5M to 7M from Thai suppliers, about 1.6M THB less at the midpoint. The "
-              "compressor is a Chinese brand bought through its Thai office (Kaishan and Denair have one), "
-              "so service stays local; with it the route saves ~1.9M THB at the midpoint (estimates from "
-              "listings, not quotes). ",
-              "The plan buys the two modules and the compressor from Thai suppliers (4.5M to 7M THB "
-              "installed for the boilers). Chinese makers with Thai references (ZOZEN, Sitong, Fangkuai, "
-              "Taiguo) could supply the boilers for roughly 2.8M to 5.5M THB installed, about 1.6M THB "
-              "less at the midpoint, and with a Chinese compressor brand bought through its Thai office "
-              "~1.9M less (estimates from listings, not quotes): a step if quotes land high. ") +
-          "The specification is a 1.25 MPa design to ASME Section I with the S stamp; most Chinese packaged "
-          "electric units are rated 0.4 to 0.8 MPa and cannot deliver 10 bar. An imported boiler must meet "
-          "TIS, ASME, JIS, EN or an equivalent standard and be verified by a certification body registered "
-          "with the Department of Industrial Works (DIW), engaged before the order (section 7). No mainland "
-          "maker has a verified Thai service partner, so a Thai boiler contractor and the certification "
-          "body are the service layer either way. Chillers and air conditioning, the larger blocks, have "
-          "not been checked for a Chinese route yet."),
+          "heat. At launch biomass saves **~4.2M THB (~0.13M USD) a year** against electric steam, so it "
+          "repays its higher price and the fuel store (~3.8M to 5.4M THB more at the midpoints than a Thai "
+          "or a Chinese electric bank) in about a year (estimates). Without electric boilers the plant's "
+          "demand stays at ~264 kW instead of ~980 kW, which also means a smaller transformer and PEA "
+          "deposit (not re-priced; an upside). The earlier staged path (start electric, add biomass later) "
+          "is dropped: each year on electric steam would cost about that ~4.2M THB more. The site still "
+          "matters: next to the pharmaceutical facility on Payap land a biomass stack is a hard sell, so "
+          "the GMP-neighbour check (section 6.1) asks about it before any design work, and the electric "
+          "bank is the fall-back there."),
+        P("**What biomass brings with it.** Fuel contracts and a dry stock for the monsoon: the 42 m² store "
+          "drawn in the utility yard holds ~6 to 7 weeks of fresh chips, and a 3-month monsoon stock needs "
+          "~80 m² (estimates). Ash to handle and dispose of. The 14 m flue stack and the dust collector, "
+          "already drawn in the utility yard. More maintenance than an electric bank, and a certified boiler "
+          "attendant from the maintenance team as the licensed boiler controller (section 7.2). Boiler "
+          "registration and the air-emission limits for a solid-fuel boiler in the permit work (to confirm, "
+          "section 7.2). And a visible point source in Chiang Mai's burning season (February to April): dust "
+          "control matters for the story as much as for the permit, and buying farm residues that would "
+          "otherwise be burned in the fields is the other half of that story."),
+        P("**Fuel.** The launch plant burns about 300 t of air-dry wood or ~460 t of fresh chips a year at "
+          "~850k records; the five-press fleet at about 1.0 million records would burn 350 to 400 t air-dry "
+          "(~540 to 620 t as fresh chips; estimates). Lamphun alone produces more than 900,000 t of farm "
+          "residues a year (Maejo University), so supply is not the constraint; price is. Reported prices "
+          "follow diesel, so the fuel contract gets a diesel clause and sources within ~50 km. The local "
+          "price-setter is Ratch Pathana's biomass buying centre at Pa Sak, Mueang Lamphun, which feeds a "
+          "9.6 MW cogeneration plant and competes for the same fuel. The team's own 60 rai of "
+          "forestry-classified land could supply 80 to 135 t a year as short-rotation coppice, an upside "
+          "once its title is checked; at market prices that is worth only ~0.1M to 0.25M THB a year, so its "
+          "value is supply security and the story ('records pressed with steam from our own trees'), not "
+          "the fuel bill. Next step: written quotes from Pa Sak and two or three chip suppliers, priced by "
+          "moisture, before the boiler order."),
+        P("**Where the boilers come from.** Both plans price the biomass modules from a Thai maker with "
+          "Thai fabrication and service (Getabec class, 6M to 10M THB installed; utilities CSV, estimate). "
+          "Chinese makers build biomass boilers too (ZOZEN DZL, Sitong DZL and SZL, Taiguo, Yongxing), but "
+          "none is priced yet: the Chinese route checked so far priced only electric boilers. " + pick(
+              "That makes a Chinese biomass quote a decision point for this plan: one ~2M THB or more below "
+              "the Thai package would bring Plan A back under 180M THB at the midpoint. What this plan takes "
+              "through the Chinese route is the compressor, a Chinese brand bought through its Thai office "
+              "(Kaishan and Denair have one) so service stays local, ~0.25M THB less at the midpoint "
+              "(estimate from listings, not a quote). ",
+              "A Chinese biomass quote is a step if quotes land high, and so is a Chinese compressor brand "
+              "bought through its Thai office (Kaishan and Denair have one), ~0.25M THB less at the midpoint "
+              "(estimate from listings, not a quote); this plan buys the compressor from a Thai supplier. ") +
+          "Any module, Thai or imported, is specified as a 1.25 MPa design to ASME Section I with the S "
+          "stamp (most Chinese packaged electric units are rated 0.4 to 0.8 MPa and cannot deliver 10 bar). "
+          "An imported boiler must meet TIS, ASME, JIS, EN or an equivalent standard and be verified by a "
+          "certification body registered with the Department of Industrial Works (DIW), engaged before the "
+          "order (section 7). No mainland maker has a verified Thai service partner, so for an imported "
+          "boiler a Thai boiler contractor and the certification body would be the service layer. Chillers "
+          "and air conditioning, the larger blocks, have not been checked for a Chinese route yet."),
         H3("Water"),
         P("Water arriving is still open: no source is confirmed for the candidate site (PWA mains, a "
           "licensed deep well, or both), and a water analysis comes before the boiler and chiller RFQs "
@@ -522,12 +548,13 @@ def blocks():
           "acceptable the cost drops materially, and that question is on the RFQ list."),
         CALL("Efficiency in one paragraph, for the investor", "Steam and cooling are built once as a "
              "backbone and filled with identical modules as presses arrive; heat is recovered from the "
-             "flue gas, the condensate and the press returns before more is generated; every roof and "
-             "canopy carries PV" + pick(" through a solar PPA", "") + " (~640 kWp, over a third of the "
-             "launch plant's electricity even with electric steam, estimate), with a battery for "
-             "ride-through; no "
-             "process water is discharged; a fifth of the plastic is reclaimed; and biomass steam, if "
-             "chosen, costs a quarter to a tenth of electric steam. The same choices push the energy line "
+             "flue gas, the condensate and the press returns before more is generated; steam comes from "
+             "biomass in both plans, at about a seventh of what electric steam would cost (~0.67M against "
+             "~4.9M THB a year at launch, estimate); the factory roof carries PV" +
+             pick(" through a solar PPA", "") + " (~520 kWp, ~61% of the launch plant's electricity, "
+             "estimate), with the office roof and the canopies ready for more panels and a battery for "
+             "ride-through; no process water is discharged; and a fifth of the plastic is reclaimed. The "
+             "same choices push the energy line "
              "toward its low end and hedge Thai tariff rises; the heat recovery and automation can count "
              "toward BOI's Smart and Sustainable Industry measure" + pick(
                  "", " and the owned battery may qualify as storage") + " (section 7.1; BOI no longer "
@@ -688,7 +715,8 @@ def blocks():
                                                          "the same land"],
         ], widths_mm=[28, 44, 44, 54], font_pt=8.5),
         P("**Galvanics now raises the bar for every site.** With the electroplating line in the plan, a "
-          "plot has to permit record pressing with a steam boiler **and** electroplating from day "
+          "plot has to permit record pressing with a biomass-fired steam boiler **and** electroplating "
+          "from day "
           "one, not in a later phase. That favours the industrial estate (licensing through the estate, "
           "shared effluent treatment) and makes zoning the first check everywhere else."),
         P("**Payap University** approached the project and is interested in leasing land next to a "
@@ -706,11 +734,12 @@ def blocks():
           "could back the PVC lab. Any Payap plot is checked in this order, before any design work:"),
         N([
             "**Zoning:** the plot's zone in the Chiang Mai city plan allows a record-pressing factory with a "
-            "steam boiler and electroplating (the neighbour's pharmaceutical permit proves little).",
+            "biomass-fired steam boiler and electroplating (the neighbour's pharmaceutical permit proves "
+            "little).",
             "**Lease-ability:** Chanote title, university council approval, and whether campus land of a "
             "private university can be leased commercially; with Thai counsel, together with the lease "
             "terms below.",
-            "**The GMP neighbour:** a pharmaceutical plant is sensitive to the boiler stack, galvanics "
+            "**The GMP neighbour:** a pharmaceutical plant is sensitive to the biomass boiler's stack, galvanics "
             "extraction, extrusion fumes, noise and trucks; emission and buffer rules go into the lease, "
             "not after the first complaint.",
             "**Flooding:** Payap describes the land as low-lying when bought; check the plot against the "
@@ -743,9 +772,9 @@ def blocks():
             "figure.",
         ]),
         P("Land requirements: ~4 rai minimum, 6 to 8 rai comfortable with expansion; truck access and "
-          "turning, parking, the detached utility yard, a separated battery enclosure, and a medium-voltage "
-          "connection from PEA (800 to 1,000 kVA for the five-press backbone without electric steam, 1,250 "
-          "to 1,600 kVA with it)."),
+          "turning, parking, the detached utility yard with truck access for biomass deliveries, a "
+          "separated battery enclosure, and a medium-voltage connection from PEA (800 to 1,000 kVA for the "
+          "five-press backbone on biomass steam; electric steam would need 1,250 to 1,600 kVA)."),
 
         H2("6.2 The building"),
         P("The main building is a single-storey steel portal frame (pre-engineered) of **60 × 25 m "
@@ -791,12 +820,14 @@ def blocks():
           "figures and their source."),
         IMG(pick("renders/calculator/plan-a-iso-roof.png", "renders/calculator/plan-b-iso-roof.png"), 170,
             "Figure 8. The site from above, " + label() + " preset of the plant and business plan calculator: "
-            "every roof and canopy carries PV, ~640 kWp on the factory, the office and the car and scooter "
-            "parking" + pick(", supplied through the solar PPA (the battery is drawn too; whether a PPA offer "
-                             "includes it is open)", ", owned with the battery") +
-            "; the utility yard (boiler hall and chiller compound built for four modules each, pump and "
-            "heat-exchanger room, transformer, water treatment, PVC silos) and the phase 2 reserve. Schematic render of the Payap scenario model (docs/fleet-calculator.html); "
-            "positions and envelopes are estimates."),
+            "PV on the factory roof, ~520 kWp" + pick(", supplied through the solar PPA (the battery is drawn "
+                                                      "too; whether a PPA offer includes it is open)",
+                                                      ", owned with the battery") +
+            ", with the office roof and the car and scooter canopies PV-ready and without panels; the "
+            "utility yard (biomass boiler hall and chiller compound built for four modules each, the "
+            "biomass fuel store, the flue stack and dust collector, pump and heat-exchanger room, "
+            "transformer, water treatment, PVC silos) and the phase 2 reserve. Schematic render of the "
+            "Payap scenario model (docs/fleet-calculator.html); positions and envelopes are estimates."),
         IMG(pick("renders/calculator/plan-a-iso-gf.png", "renders/calculator/plan-b-iso-gf.png"), 170,
             "Figure 9. Ground floor with the roofs cut away, " + label() + " preset: from the west end the "
             "staff entry, workshop, galvanics (PASU, PPPU, PDPU, PMPB), Sibert stamper prep, metrology" +
@@ -810,12 +841,14 @@ def blocks():
         IMG(pick("renders/calculator/plan-a-iso-hall.png", "renders/calculator/plan-b-iso-hall.png"), 170,
             "Figure 10. The press hall close up, " + label() + " preset: " + pick(
                 "Duplex system 1 (two HRP 12 presses with their extruders) and the Classic; the dashed "
-                "outlines are the free Duplex bays and Classic positions for growth. In the yard, boiler "
-                "modules B-1 and B-2 and chillers CH-1 and CH-2, with B-3, B-4, CH-3 and CH-4 free",
+                "outlines are the free Duplex bays and Classic positions for growth. In the yard, biomass "
+                "boiler modules B-1 and B-2 with the fuel store, flue stack and dust collector, and chillers "
+                "CH-1 and CH-2, with B-3, B-4, CH-3 and CH-4 free",
                 "Duplex system 1 (two HRP 12 presses with their extruders) and the Classic, in a hall laid "
                 "out for five Duplex bays and four Classic positions; the dashed outlines are the free bays "
-                "and positions for growth. In the yard, boiler modules B-1 and B-2 and chillers CH-1 and "
-                "CH-2, with B-3, B-4, CH-3 and CH-4 free; the 5 t crane over the hall, the visitor corridor "
+                "and positions for growth. In the yard, biomass boiler modules B-1 and B-2 with the fuel "
+                "store, flue stack and dust collector, and chillers CH-1 and CH-2, with B-3, B-4, CH-3 and "
+                "CH-4 free; the 5 t crane over the hall, the visitor corridor "
                 "and the cassette and CD-R rooms are in place") +
             ". Schematic, estimates."),
         H3("Crane, workshop and visitor corridor"),
@@ -873,17 +906,18 @@ def blocks():
         ])),
         H3("Utility yard and water-treatment building"),
         T(["Detached utility yard (decided October 2026)", "Size (estimate)"], [
-            ["Boiler hall, four 500 kg/h module positions (B-1 and B-2 at launch)", "~162 m² (18 × 9 m), "
+            ["Boiler hall, four 500 kg/h biomass module positions (B-1 and B-2 at launch)", "~162 m² (18 × 9 m), "
                                                                                  "6.0 m high"],
-            ["Biomass fuel store", "42 m²"],
+            ["Biomass fuel store (~6 to 7 weeks of fresh chips; ~80 m² would hold a 3-month monsoon "
+             "stock)", "42 m² drawn"],
             ["Chiller compound, open and screened, four pads (CH-1 and CH-2"
              " at launch)", "~135 m² (12.5 × "
                                                                                        "10.8 m)"],
             ["Cooling pump and heat-exchanger room", "~40 m² (8 × 5 m)"],
-            ["Flue stack", "14 m"],
+            ["Flue stack, with the dust collector and fans along the boiler hall's back wall", "14 m"],
             ["**Yard in all**", "**~379 m²**, against 178 m² before the four-module decision"],
         ], widths_mm=[110, 60],
-           caption="The fired case sets the boiler hall (an electric bank would need about half). No "
+           caption="The biomass bank of both plans sets the boiler hall (an electric bank would need about half). No "
                    "cooling tower: the chillers are air-cooled. The rooms are built once for four modules "
                    "and the plant goes in one module at a time; the yard sits outside the main building "
                    "because the boiler must have its own room and biomass deliveries need yard access."),
@@ -904,8 +938,8 @@ def blocks():
         H3("Site works and the second building"),
         P("On the Mueang Chi parcel the site works are a ~444 m perimeter wall, one 10 m sliding gate with "
           "a guard house, 4,387 m² of paving in two classes (1,608 m² heavy-duty for trucks, 2,779 m² "
-          "general), roofed parking for 10 cars and 30 scooters with its canopies fully covered in PV (~54 "
-          "kWp; ~40 kWp in the construction RFQ), a ring foundation "
+          "general), roofed parking for 10 cars and 30 scooters under PV-ready canopies (steel for ~40 "
+          "kWp of panels in the construction RFQ; panels later), a ring foundation "
           "for a 9 m fire-water tank with its pump house and one for a 5 m raw-water tank, a fire ring main "
           "and hydrants, stormwater drainage and domestic sanitation. With the buildings, ~6,549 m² or 68% "
           "of the modelled plot is sealed, so stormwater attenuation, quite possibly a detention pond, may "
@@ -930,7 +964,9 @@ def blocks():
           "utility yard with floors, pads and plinths for all four positions; a lump sum for the rest of "
           "the site works; and the foundation assumption behind all of it. It excludes process machinery, "
           "PV, air conditioning, boilers, chillers and tanks, sprinklers, fit-out and the PEA transformer, "
-          "and asks whether permit drawings for the building permit and the factory licence are included."),
+          "and asks whether permit drawings for the building permit and the factory licence are included. "
+          "The PV-ready provisions (the canopy steel it already specifies, roof loads for panels, conduit to "
+          "the main board and a spare way for a later inverter) belong to the same works."),
         H3("What the building costs, and what is not known"),
         T(["Block", "USD", "THB", "Basis"], [
             ["Building ~1,500 m² plus civil and site works", "650k to 1,100k", "21.4M to 36.3M",
@@ -948,7 +984,8 @@ def blocks():
                  ["Visitor corridor and accessible entrance", "67k to 148k", "2.2M to 4.9M", "estimate; "
                   "building it later would take ~3.6M THB out at the midpoint"]),
             ["Utility yard for four boiler and four chiller modules", "73k to 122k", "2.4M to 4.0M",
-             "estimate at the building rate"],
+             "estimate at the building rate; the biomass fuel store and handling (1.0M to 2.0M THB) sit in "
+             "the utilities block"],
             ["Water-treatment building next to galvanics", "52k to 87k", "1.7M to 2.9M", "estimate at the "
                                                                                        "building rate"],
             pick(["**Together**", "**~0.84M to 1.48M**", "**~28M to 49M**", "sum of the blocks; the plan "
@@ -979,8 +1016,8 @@ def blocks():
           "decontamination procedures, eyewash and emergency shower at the line, and a hard-wired "
           "interlock (no extraction, no plating). A machine is lifted only after lockout (power isolated, "
           "steam vented, hydraulics depressurised including the accumulator) and with a lift plan; hot work "
-          "stays in the workshop under a permit; the boilers run under a licensed boiler controller "
-          "(section 7)."),
+          "stays in the workshop under a permit; the biomass boilers run under a licensed boiler "
+          "controller, a certified attendant from the maintenance team (section 7.2)."),
         P("Decided in October 2026: every member of staff, office included, gets group health insurance "
           "(inpatient and outpatient) and a yearly check-up on top of social security, plus the "
           "occupational checks Thai law requires for risk-factor work (press-floor heat and noise, "
@@ -1060,8 +1097,8 @@ def blocks():
           "machinery and raw materials lives, from the first capex invoice."),
         P("**Process:** file via the e-Investment system and present at an analyst meeting. BOI quotes "
           "about 40 working days to a decision for projects under THB 200M and 60 to 90 working days for "
-          "larger tiers; at " + pick("~127M to 226M THB with the ramp-up reserve (~177M at the midpoint)",
-                                     "~156M to 275M THB with the ramp-up reserve (~216M at the midpoint)") +
+          "larger tiers; at " + pick("~132M to 233M THB with the ramp-up reserve (~182M at the midpoint)",
+                                     "~156M to 277M THB with the ramp-up reserve (~217M at the midpoint)") +
           " the plan sits around that line, so the consultant "
           "confirms which applies. In practice it is roughly 4 to 6 months end to end to the certificate; "
           "the company is incorporated under it; machinery is imported within a window commonly 30 months "
@@ -1071,7 +1108,8 @@ def blocks():
           "directly."),
         H2("7.2 Factory licence, galvanics and boilers"),
         P("BOI promotion does not replace the factory licence (Ror.Ngor. 4), hazardous-substance "
-          "registration for the plating chemistry, wastewater permitting or the boiler rules. **Galvanics "
+          "registration for the plating chemistry, wastewater permitting, the boiler rules or the air-emission "
+          "limits for the biomass boiler's stack. **Galvanics "
           "is in the plant from launch, so the electroplating line, its chemistry and its zero-discharge "
           "effluent system are in the first factory licence application**, not a later amendment. The "
           "earlier plan to keep galvanics out of the first licence to protect the schedule no longer "
@@ -1079,7 +1117,7 @@ def blocks():
           "sits on the path to the first paying release:"),
         B([
             "**The site must permit plating from day one** (section 6.1): zoning has to allow a "
-            "record-pressing factory with a steam boiler and an electroplating line. The industrial "
+            "record-pressing factory with a biomass-fired steam boiler and an electroplating line. The industrial "
             "estate's licensing and shared effluent treatment are the easiest path; on Mueang Chi the "
             "permit is ours; on Payap land the lessor's written consent comes on top.",
             "**Zero discharge is the design, and the application says so:** rinse water through the ZLD "
@@ -1100,13 +1138,16 @@ def blocks():
           "reported to DIW within 30 days; **a licensed boiler controller on site**; and **inspection at "
           "least once a year**. The relief for small once-through units does not apply at ~10.5 bar (our "
           "reading), and the labour-side regulation of 2021 adds licensed-engineer installation and "
-          "testing and a feedwater standard. " + pick(
-              "**This plan's two boiler bodies come from a Chinese maker, so they take the imported-boiler "
-              "route of the notification:** verification by a registered certification body with the full "
-              "dossier, and an ASME Section I design at 1.25 MPa with the S stamp, because a boiler built "
-              "to the Chinese GB code would rest on 'or equivalent' with no precedent found. ",
-              "The plan's modules come from Thai suppliers to the same ASME specification; a Chinese "
-              "boiler built to the Chinese GB code would rest on 'or equivalent' with no precedent found. ") +
+          "testing and a feedwater standard. Both plans price the biomass modules from a Thai maker to the "
+          "ASME specification of section 5.4. A Chinese biomass boiler" + pick(
+              " (the open decision point of section 5.4)", "") + " would take the imported-boiler route of "
+          "the notification: verification by a registered certification body with the full dossier, and an "
+          "ASME Section I design at 1.25 MPa with the S stamp, because a boiler built to the Chinese GB code "
+          "would rest on 'or equivalent' with no precedent found. **Biomass adds to the permit work** (to "
+          "confirm with the permit engineer before the RFQ): the boiler registered with DIW; the air-emission "
+          "limits for a solid-fuel boiler met at the 14 m stack, with the dust collector in the boiler "
+          "package; the fuel store and ash handling in the factory licence drawings; and the licensed "
+          "boiler controller, a certified attendant from the maintenance team. " +
           "DIW has announced a "
           "revision of the boiler, pressure-vessel and refrigeration rules, so they are rechecked before "
           "the RFQ, and a certification body is engaged before any boiler order."),

docs/business-plan/build/content_c.py

@@ -48,29 +48,36 @@ def _block_rows():
               "station", "350k to 810k", "11.6M to 26.7M", "Estimate; all of it at launch (Plan A buys the laser "
                                                          "confocal and the wide-area profiler from revenue)"]),
         ["PVC lab, day-one tier", "55k to 150k", "1.8M to 5.0M", "Estimate"],
-        pick(["Steam, cooling and compressed air: two 500 kg/h boiler modules (priced electric), cooling "
-              "backbone for four modules (plate heat exchanger, tanks, pumps, mains), two 250 kW chiller "
-              "modules (CH-1, CH-2), screw compressor, dryer and receiver", "239k to 416k", "7.9M to 13.7M",
-              "Researched: utilities rows; boilers and compressor through the Chinese route (lever 6): "
-              "ASME-stamped 1.25 MPa boiler bodies installed by a Thai contractor, the compressor from a "
-              "Chinese brand's Thai office"],
-             ["Steam, cooling and compressed air: two 500 kg/h boiler modules (priced electric), cooling "
-              "backbone for four modules (plate heat exchanger, tanks, pumps, mains), two 250 kW chiller "
-              "modules (CH-1, CH-2), screw compressor, dryer and receiver", "296k to 470k", "9.8M to 15.5M",
-              "Researched: utilities rows; boilers and compressor from Thai suppliers, with local service"]),
+        ["Steam: two 500 kg/h biomass boiler modules (B-1, B-2; Getabec class), installed with fuel feed, "
+         "grate and dust control", "182k to 303k", "6.0M to 10.0M", "Researched: utilities rows, the biomass "
+         "package for ~1 t/h (engineering estimate); both plans run on biomass (decided 17 October 2026); the "
+         "electric bank (Thai 4.5M to 7.0M, Chinese route 2.8M to 5.5M) is the alternative, not the plan"],
+        ["Biomass fuel store and handling: covered fuel store, chip bay, ash bins, a compact loader",
+         "30k to 61k", "1.0M to 2.0M", "Estimate, utilities rows: 42 m² store drawn (~6 to 7 weeks of fresh "
+         "chips), ~80 m² for a 3-month monsoon stock"],
+        pick(["Cooling and compressed air: cooling backbone for four modules (plate heat exchanger, tanks, "
+              "pumps, mains), two 250 kW chiller modules (CH-1, CH-2), screw compressor, dryer and receiver",
+              "153k to 248k", "5.05M to 8.2M", "Researched: utilities rows; the compressor through the Chinese "
+              "route (lever 6), from a Chinese brand's Thai office"],
+             ["Cooling and compressed air: cooling backbone for four modules (plate heat exchanger, tanks, "
+              "pumps, mains), two 250 kW chiller modules (CH-1, CH-2), screw compressor, dryer and receiver",
+              "159k to 258k", "5.25M to 8.5M", "Researched: utilities rows; the compressor from a Thai supplier, "
+              "with local service"]),
         ["Whole-factory HVAC, clean-room adder for galvanics and the cutting room, softener, loop treatment, "
          "racking", "297k to 627k", "9.8M to 20.7M", "Researched: utilities rows"],
     ]
     if not a:
-        rows.append(["Solar PV (EPC) on every roof and canopy, ~640 kWp, and the 271 kWh Gobel battery, owned",
-                     "449k to 610k", "14.8M to 20.1M",
-                     "Researched: utilities rows; PV at 20 to 26 THB/W installed, inverters included (12.8M to "
-                     "16.6M), battery 2.0M to 3.5M; ~85 % of the yield used on site under zero export (estimate); "
+        rows.append(["Solar PV (EPC) on the factory roof, ~520 kWp, and the 271 kWh Gobel battery, owned (the "
+                     "office roof and the canopies PV-ready, panels later)",
+                     "376k to 516k", "12.4M to 17.0M",
+                     "Researched: utilities rows; PV at 20 to 26 THB/W installed, inverters included (10.4M to "
+                     "13.5M), battery 2.0M to 3.5M; ~87 % of the yield used on site under zero export (estimate); "
                      "owned, so the plant keeps the whole bill saving (no BOI promotion for solar installations "
                      "since 1 July 2025, section 8.4)"])
     rows += [
         ["Building ~1,500 m² plus civil and site works", "650k to 1,100k", "21.4M to 36.3M", "Estimate at "
-         "12,000 to 20,000 THB/m² plus ~20 % site works; soil is the main variable"],
+         "12,000 to 20,000 THB/m² plus ~20 % site works; soil is the main variable; includes making the office "
+         "roof and the canopies PV-ready (structure, conduit; small, estimate)"],
         pick(["Crane rented for the installations (mobile crane); frame, runway and machine door stay "
               "crane-ready", "39k to 91k", "1.3M to 3.0M", "Estimate: 40 % of the crane block (lever 5)"],
              ["Overhead crane, runway, frame premium, machine door", "97k to 227k", "3.2M to 7.5M", "Estimate"]),
@@ -95,22 +102,22 @@ def _block_rows():
          "4.5M to 9.7M", "Estimate; land is leased, so no land purchase"],
     ]
     if a:
-        rows.append(["Not bought at launch (levers, section 8.2): solar PV on every roof and canopy (~640 kWp) "
+        rows.append(["Not bought at launch (levers, section 8.2): solar PV on the factory roof (~520 kWp) "
                      "and the battery (solar PPA), visitor corridor, cassette and CD-R duplication", "none", "none", "The PPA installer owns and "
                      "finances the array; the rest are growth steps from revenue"])
     rows += [
-        pick(["**Subtotal, plan investment**", "**~3.56M to 6.25M**", "**~117.4M to 206.1M**",
-              "**Midpoint ~161.7M THB (~4.90M USD)**"],
-             ["**Subtotal, plan investment**", "**~4.42M to 7.73M**", "**~145.9M to 255.2M**",
-              "**Midpoint ~200.6M THB (~6.08M USD)**"]),
+        pick(["**Subtotal, plan investment**", "**~3.68M to 6.44M**", "**~121.6M to 212.6M**",
+              "**Midpoint ~167.1M THB (~5.06M USD)**"],
+             ["**Subtotal, plan investment**", "**~4.42M to 7.79M**", "**~146.0M to 257.1M**",
+              "**Midpoint ~201.6M THB (~6.11M USD)**"]),
         ["Ramp-up reserve: staff hired before first revenue, overheads until volume covers them",
          "~0.30M to 0.61M", "10M to 20M", "Estimate; cash the investor puts in, so it is in the plan price"],
-        pick(["**Plan A price**", "**~3.86M to 6.85M**", "**~127M to 226M**",
-              "**Midpoint ~177M THB (~5.35M USD): ~180M THB**"],
-             ["**Plan B price**", "**~4.72M to 8.34M**", "**~156M to 275M**",
-              "**Midpoint ~216M THB (~6.53M USD): ~215M THB**"]),
+        pick(["**Plan A price**", "**~3.99M to 7.05M**", "**~132M to 233M**",
+              "**Midpoint ~182M THB (~5.52M USD): ~180M THB, ~2M above 180M**"],
+             ["**Plan B price**", "**~4.73M to 8.40M**", "**~156M to 277M**",
+              "**Midpoint ~217M THB (~6.56M USD): ~215M THB**"]),
         ["Contingency: not in the plan price", "", "", pick(
-            "For information: at 15 %, ~24M THB at the midpoint",
+            "For information: at 15 %, ~25M THB at the midpoint",
             "For information: at 15 %, ~30M THB at the midpoint")],
     ]
     return rows
@@ -119,28 +126,30 @@ def _block_rows():
 def _levers_table():
     """Plan A: the six levers from the launch plant with every block, midpoints, no contingency."""
     return T(["Step", "Saves", "Subtotal after it", "What it gives up"], [
-        ["Launch plant, every block, no contingency", "", "~200.6M THB (~6.08M USD)", ""],
-        ["1. Solar on every roof and canopy (~640 kWp) and the battery through a solar PPA (the installer owns "
-         "and finances the array; the plant buys the power)", "~17.5M", "~183.1M", "Owned solar and its whole "
-         "bill saving: adds the PPA power price to the energy bill, ~0.07M USD (~2.3M THB) a year in the "
-         "calculator for ~760 MWh used on site at 3.0 THB/kWh (estimate, to quote)"],
+        ["Launch plant, every block, no contingency", "", "~201.6M THB (~6.11M USD)", ""],
+        ["1. Solar on the factory roof (~520 kWp) and the battery through a solar PPA (the installer owns "
+         "and finances the array; the plant buys the power)", "~14.7M", "~186.9M", "Owned solar and its whole "
+         "bill saving: adds the PPA power price to the energy bill, ~0.06M USD (~1.9M THB) a year in the "
+         "calculator for ~633 MWh used on site at 3.0 THB/kWh (estimate, to quote)"],
         ["2. Metrology launch tier: XRF, inline vision and audio station at launch; laser confocal and "
-         "wide-area profiler (USD 180k to 350k) bought from revenue", "~8.8M", "~174.4M", "Every stamper and "
+         "wide-area profiler (USD 180k to 350k) bought from revenue", "~8.8M", "~178.1M", "Every stamper and "
          "record is still measured (XRF, inline vision on the presses, audio station); the confocal and the "
          "profiler come later"],
-        ["3. Visitor corridor built later", "~3.6M", "~170.8M", "No public tours at first: the tour route and "
+        ["3. Visitor corridor built later", "~3.6M", "~174.5M", "No public tours at first: the tour route and "
                                                                 "the Payap programmes around it start later"],
-        ["4. Cassette and CD-R duplication later", "~4.0M", "~166.8M", "No cassette or CD-R at launch; a growth "
+        ["4. Cassette and CD-R duplication later", "~4.0M", "~170.5M", "No cassette or CD-R at launch; a growth "
                                                                        "step"],
-        ["5. Crane rented for the installations (mobile crane)", "~3.2M", "~163.6M", "No overhead crane at "
+        ["5. Crane rented for the installations (mobile crane)", "~3.2M", "~167.3M", "No overhead crane at "
          "first; frame, runway and machine door stay crane-ready, so it can be bought later if needed"],
-        ["6. Boilers and compressor through the Chinese route", "~1.9M", "**~161.7M (~4.90M USD)**",
-         "Imported boilers take the Thai route (Ministry of Industry boiler notification B.E. 2549: design "
-         "and import rules, a certification body registered with the Department of Industrial Works) with an "
-         "ASME S stamp at 1.25 MPa"],
+        ["6. Compressor through the Chinese route (a Chinese brand's Thai office)", "~0.25M",
+         "**~167.1M (~5.06M USD)**", "A Chinese brand's screw compressor (Kaishan or Denair, both with Thai "
+         "offices) instead of a Thai supplier's. The route priced only electric boilers; Chinese biomass "
+         "boilers (ZOZEN, Sitong, Taiguo, Yongxing) are not priced yet, and a quote ~2M THB or more below the "
+         "Thai biomass package would put Plan A back under 180M"],
         ["Ramp-up reserve", "", "+10M to 20M", ""],
-        ["**Plan A**", "", "**~177M THB (~5.35M USD)**", "~127M to 226M from the low to the high end of every "
-                                                        "block"],
+        ["**Plan A**", "", "**~182M THB (~5.52M USD)**", "**~2M above 180M at the midpoint** (177M to 187M "
+                                                        "with the reserve's 10M to 20M); ~132M to 233M from "
+                                                        "the low to the high end of every block"],
     ], widths_mm=[56, 16, 32, 66], font_pt=8.5,
         caption="Midpoint values without contingency, estimates; docs/finance/total-investment.md 'Two plans'. "
                 "The levers keep every machine of the launch plant.")
@@ -149,10 +158,11 @@ def _levers_table():
 def _keeps_table():
     """Plan B: what it keeps that Plan A's six levers move off the launch budget, midpoints, no contingency."""
     return T(["In at launch in Plan B", "What it gives the plant", "THB, midpoint (Plan A's lever)"], [
-        ["Solar PV on every roof and canopy (~640 kWp) and the 271 kWh battery, owned (EPC and Gobel battery)",
-         "No PPA power bill: the whole saving on the ~760 MWh used on site (~2.8M to 3.0M THB a year) stays "
-         "with the plant instead of ~2.3M THB (~0.07M USD) a year going to a PPA installer; payback ~4.2 to "
-         "5.9 years (estimates)", "~17.5M"],
+        ["Solar PV on the factory roof (~520 kWp; the office roof and the canopies PV-ready) and the 271 kWh "
+         "battery, owned (EPC and Gobel battery)",
+         "No PPA power bill: the whole saving on the ~633 MWh used on site (~2.3M to 2.5M THB a year) stays "
+         "with the plant instead of ~1.9M THB (~0.06M USD) a year going to a PPA installer; payback ~4.1 to "
+         "5.8 years (estimates)", "~14.7M"],
         ["Metrology, full stack: XRF, laser confocal, wide-area profiler, inline vision, audio station",
          "Every stamper measured fully from the first release, the core of the traceability pitch", "~8.8M"],
         ["Visitor corridor and accessible entrance", "Public tours and the Payap programmes possible from the "
@@ -161,47 +171,44 @@ def _keeps_table():
         ["5 t overhead crane, runway, frame premium, machine door, bought", "Its own crane over the press "
                                                                             "hall; no mobile crane to rent for "
                                                                             "the installations", "~3.2M"],
-        ["Boilers and compressor from Thai suppliers", "Local service; no import route for the boilers",
-         "~1.9M"],
-        ["**Together**", "", "**~39M (200.6M minus Plan A's 161.7M)**"],
-        ["Launch plant, every block, no contingency: Plan B's subtotal", "", "~200.6M (~6.08M USD)"],
+        ["Screw compressor from a Thai supplier", "Local service", "~0.25M"],
+        ["**Together**", "", "**~34.5M (201.6M minus Plan A's 167.1M)**"],
+        ["Launch plant, every block, no contingency: Plan B's subtotal", "", "~201.6M (~6.11M USD)"],
         ["Ramp-up reserve", "", "+10M to 20M"],
-        ["**Plan B**", "", "**~216M THB (~6.53M USD)**; ~156M to 275M from the low to the high end"],
+        ["**Plan B**", "", "**~217M THB (~6.56M USD)**; ~156M to 277M from the low to the high end"],
     ], widths_mm=[62, 70, 38], font_pt=8.5,
         caption="Midpoint values without contingency, estimates; docs/finance/total-investment.md 'Two plans'. "
-                "Each figure is what the matching Plan A lever saves; rounded, the six add to ~39.0M, and the "
-                "two subtotals differ by ~38.9M.")
+                "Each figure is what the matching Plan A lever saves; rounded, the six add to ~34.6M, and the "
+                "two subtotals differ by ~34.5M. Steam is biomass in both plans, so the boilers are not a "
+                "difference between them.")
 
 
 def _tranches():
     return T(["Tranche", "Trigger", "Covers", "Approx. share, THB"], [
         ["0", "Now", "Phase 0 work (section 14.1)", "The Phase 0 block, ~1.3M to 2.6M (1 to 2 %)"],
         ["1", "BOI certificate issued; lease signed; zoning and soil confirmed; pricing validated",
-         pick("Deposits on every long-lead order: Pheenix galvanics line, Sillitoe lathe, Sibert line, Newbilt "
-              "Duplex system and Classic; building design and permit; first boiler and chiller modules "
-              "(boilers and compressor through the Chinese route)",
-              "Deposits on every long-lead order: Pheenix galvanics line, Sillitoe lathe, Sibert line, Newbilt "
-              "Duplex system and Classic; building design and permit; first boiler and chiller modules "
-              "(boilers and compressor from Thai suppliers)"),
-         pick("20 to 30 % (~32M to 49M)", "20 to 30 % (~40M to 60M)")],
+         "Deposits on every long-lead order: Pheenix galvanics line, Sillitoe lathe, Sibert line, Newbilt "
+         "Duplex system and Classic; building design and permit; the two biomass boiler modules and the first "
+         "two chiller modules",
+         pick("20 to 30 % (~33M to 50M)", "20 to 30 % (~40M to 60M)")],
         ["2", "Building permit; vendor build dates confirmed in writing",
          "Construction, water-treatment building, utility yard, utilities, balance payments as machines are "
          "built",
-         pick("35 to 45 % (~57M to 73M)", "35 to 45 % (~70M to 90M)")],
+         pick("35 to 45 % (~58M to 75M)", "35 to 45 % (~71M to 91M)")],
         ["3", "Building watertight; first machinery shipped",
          pick("Fit-out, HVAC and clean zones, ZLD and DI water, the rented crane for the installations, the "
               "metrology launch tier, factory software and ERPNext, the launch team",
-              "Fit-out, HVAC and clean zones, ZLD and DI water, solar PV on every roof and canopy and the "
+              "Fit-out, HVAC and clean zones, ZLD and DI water, solar PV on the factory roof and the "
               "battery, crane, visitor corridor, the full metrology stack, factory software and ERPNext, cassette and CD-R lines, the "
               "launch team"),
-         pick("15 to 20 % (~24M to 32M)", "15 to 20 % (~30M to 40M)")],
+         pick("15 to 20 % (~25M to 33M)", "15 to 20 % (~30M to 40M)")],
         ["4", "Cutting room and galvanics commissioned; first stampers made", "Working capital, PVC stock, "
          "spares, first-year rent; the ramp-up reserve (10M to 20M THB, in the plan price) is drawn from here "
-         "on", pick("8 to 12 % (~13M to 19M), plus the reserve", "8 to 12 % (~16M to 24M), plus the reserve")],
+         "on", pick("8 to 12 % (~13M to 20M), plus the reserve", "8 to 12 % (~16M to 24M), plus the reserve")],
     ], widths_mm=[14, 46, 78, 32], font_pt=8.5,
-        caption=pick("Shares of Plan A's investment before the reserve (~161.7M THB at the midpoint); the THB "
+        caption=pick("Shares of Plan A's investment before the reserve (~167.1M THB at the midpoint); the THB "
                      "figures are the shares applied to it (arithmetic, estimates).",
-                     "Shares of Plan B's investment before the reserve (~200.6M THB at the midpoint); the THB "
+                     "Shares of Plan B's investment before the reserve (~201.6M THB at the midpoint); the THB "
                      "figures are the shares applied to it (arithmetic, estimates)."))
 
 
@@ -218,11 +225,11 @@ def _operating_table():
             ["**Total contribution**", "**0.68M**", "**2.06M**", "**3.99M**"],
             ["Cash overheads", "0.45M", "0.33M", "0.20M"],
             ["**EBITDA**", "**0.23M**", "**1.73M**", "**3.79M**"],
-            ["Depreciation", "0.62M", "0.39M", "0.24M"],
-            ["**Operating profit**", "**-0.39M**", "**1.34M**", "**3.55M**"],
+            ["Depreciation", "0.64M", "0.40M", "0.25M"],
+            ["**Operating profit**", "**-0.41M**", "**1.33M**", "**3.54M**"],
             ["Revenue", "2.28M (~75M THB)", "3.65M (~120M THB)", "5.41M (~179M THB)"],
-            ["Payback on the plan price (EBITDA, mature year)", "~30 yr", "~3.1 yr (2.2 to 4.0 on 3.86M to "
-                                                                         "6.85M)", "~1.0 yr"],
+            ["Payback on the plan price (EBITDA, mature year)", "~31 yr", "~3.2 yr (2.3 to 4.1 on 3.99M to "
+                                                                         "7.05M)", "~1.1 yr"],
         ]
     else:
         rows = [
@@ -235,11 +242,11 @@ def _operating_table():
             ["**Total contribution**", "**0.68M**", "**2.06M**", "**3.99M**"],
             ["Cash overheads", "0.45M", "0.33M", "0.20M"],
             ["**EBITDA**", "**0.23M**", "**1.73M**", "**3.79M**"],
-            ["Depreciation", "0.77M", "0.49M", "0.29M"],
-            ["**Operating profit**", "**-0.54M**", "**1.24M**", "**3.50M**"],
+            ["Depreciation", "0.78M", "0.49M", "0.29M"],
+            ["**Operating profit**", "**-0.55M**", "**1.24M**", "**3.50M**"],
             ["Revenue", "2.28M (~75M THB)", "3.65M (~120M THB)", "5.41M (~179M THB)"],
-            ["Payback on the plan price (EBITDA, mature year)", "~36 yr", "~3.8 yr (2.7 to 4.8 on 4.72M to "
-                                                                         "8.34M)", "~1.2 yr"],
+            ["Payback on the plan price (EBITDA, mature year)", "~37 yr", "~3.8 yr (2.7 to 4.9 on 4.73M to "
+                                                                         "8.40M)", "~1.2 yr"],
         ]
     return T(["USD per year, mature", "Adverse", "Central", "Favourable"], rows, widths_mm=[50, 36, 48, 36],
              caption="Estimates, docs/finance/revenue-model.md 'Operating pictures of Plan A and Plan B (October "
@@ -257,15 +264,15 @@ def _risk_rows():
     ]
     rows += [
         ["High", "No contingency in the plan price", pick(
-            "Quotes landing high are not covered: at 15 % a contingency would be ~24M THB at the midpoint, "
-            "and the high end of every block comes to ~226M with the reserve",
+            "Quotes landing high are not covered: at 15 % a contingency would be ~25M THB at the midpoint, "
+            "and the high end of every block comes to ~233M with the reserve",
             "Quotes landing high are not covered: at 15 % a contingency would be ~30M THB at the midpoint, "
-            "and the high end of every block comes to ~275M with the reserve"),
+            "and the high end of every block comes to ~277M with the reserve"),
          "The requests that settle most of the band come before commitment (section 8.4); tranche release; "
          "how overruns are funded (outside the plan price or by scope steps) agreed with the investor up "
          "front"],
         ["High", "Utilisation and price", pick(
-            "The cost structure is mostly fixed; the adverse case loses money: it needs ~0.9M records to cover "
+            "The cost structure is mostly fixed; the adverse case loses money: it needs ~1.0M records to cover "
             "depreciation and the three presses make 0.58M at that rate; at 60 % specials the Duplex rate and "
             "the extra cost of specials decide volume and margin",
             "The cost structure is mostly fixed; the adverse case loses money: it needs ~1.1M records to cover "
@@ -298,18 +305,18 @@ def _risk_rows():
     ]
     if a:
         rows.append(["Medium", "Solar PPA price", "The PPA gives up owning the bill saving and adds a power "
-                     "price, ~0.07M USD (~2.3M THB) a year in the calculator at 3.0 THB/kWh, an estimate to "
+                     "price, ~0.06M USD (~1.9M THB) a year in the calculator at 3.0 THB/kWh, an estimate to "
                      "quote. No BOI benefit is lost: the BOI dropped solar installations from its promotion on "
                      "1 July 2025 (Announcement 3/2568); a PPA developer may itself be promoted (activity 7.1.2, "
                      "an 8-year corporate income tax exemption), which may or may not show in its price",
                      "PPA offers next to the purchase quote in phase 0, the developer's BOI promotion raised in "
                      "the price negotiation; buying the array, as Plan B does, stays the alternative"])
     else:
-        rows.append(["Medium", "The extra ~39M THB earns little in the model", "Plan B's operating picture is "
-                     "Plan A's (same presses, records, revenue and EBITDA; the calculator puts it ~0.07M USD a "
-                     "year ahead, the PPA bill its owned array avoids): the ~39M THB more at launch adds "
-                     "depreciation, so central operating profit is 1.24M against 1.34M USD, payback ~3.8 against "
-                     "~3.1 years and the adverse corner deeper; its case rests on that bill and on what the "
+        rows.append(["Medium", "The extra ~35M THB earns little in the model", "Plan B's operating picture is "
+                     "Plan A's (same presses, records, revenue and EBITDA; the calculator puts it ~0.06M USD a "
+                     "year ahead, the PPA bill its owned array avoids): the ~35M THB more at launch adds "
+                     "depreciation, so central operating profit is 1.24M against 1.33M USD, payback ~3.8 against "
+                     "~3.2 years and the adverse corner deeper; its case rests on that bill and on what the "
                      "table leaves out (cassette and CD-R sales, tours and the Payap programmes, full stamper "
                      "metrology for the traceability pitch)", "Phase 0 prices each item against its lever (PPA "
                      "offer next to the purchase quote, cassette and CD-R quotes); most items can also come "
@@ -325,18 +332,22 @@ def _risk_rows():
                                                                   "water-treatment building from the "
                                                                   "start; industrial estate option; "
                                                                   "lessor's consent on Payap land"],
-        ["Medium", "Utilities fuel choice open", "Biomass heat costs a quarter to a tenth of electric steam "
-         "at reported fuel prices; electric steam needs a larger grid connection, biomass a secured fuel "
-         "supply", "Decide before the boiler request and the grid application; quote electric and fired "
-                   "variants of the same modules"],
-        ["Medium", "Boiler import compliance (DIW)", pick(
-            "This plan imports its boiler modules from China: an imported boiler must meet ASME, JIS, EN or "
-            "equivalent and be verified by a DIW-registered certification body; the modules run above the "
-            "once-through relief",
-            "An imported boiler must meet ASME, JIS, EN or equivalent and be verified by a DIW-registered "
-            "certification body; the modules run above the once-through relief"),
-         "ASME Section I design with the S stamp and the full dossier; certification body engaged before the "
-         "order; the same for a Thai-bought boiler"],
+        ["Medium", "Biomass steam: fuel, permits and the burning season", "Fuel price and supply set the "
+         "steam cost (planning price 1.35 to 2 THB/kg delivered; ~460 t of fresh chips a year at ~850k "
+         "records, ~0.67M THB, estimate); boiler registration and the air-emission limits for a solid-fuel "
+         "boiler come into the permit work (to confirm); the stack is a visible point source in Chiang Mai's "
+         "burning season", "Fuel contracts and a 3-month monsoon stock (~80 m² of covered store); the team's "
+         "60 rai of own fuelwood later, after the land-title check; the dust collector and the 14 m stack "
+         "drawn from the start, dust control part of the plant's story; a certified boiler attendant from "
+         "the maintenance team; electric modules stay the fallback" + pick(
+             "; a Chinese biomass boiler quote ~2M THB or more below the Thai package would bring Plan A back "
+             "under 180M", "")],
+        ["Medium", "Boiler registration and import rules (DIW)", "Every steam boiler is registered with the "
+         "Department of Industrial Works and run by a certified attendant; a boiler bought abroad must also "
+         "meet ASME, JIS, EN or equivalent and be verified by a DIW-registered certification body" + pick(
+             ", which applies if Plan A takes a Chinese biomass boiler", ""),
+         "A Thai-fabricated biomass package (Getabec class) as the base; for an import, ASME Section I design "
+         "with the S stamp and the full dossier, the certification body engaged before the order"],
         ["Medium", "Single press vendor (Newbilt)", "All three presses, the extruders and the hydraulic "
          "aggregates come from one small German manufacturer; build time and order book unknown",
          "Spares and service terms in the re-quote; the Pheenix automatic press stays the comparison if the "
@@ -368,7 +379,7 @@ def _risk_rows():
               "warranty move to the installer, but the plant still depends on the array", "Engineering checks "
               "of the installer's design in phase 0; large float"],
              ["Low", "Solar and battery integration", "Rack voltage vs inverter window; unpublished "
-              "certifications; mixed-vendor warranty; under PEA's zero export ~15 % of the ~640 kWp array's "
+              "certifications; mixed-vendor warranty; under PEA's zero export ~13 % of the ~520 kWp array's "
               "yield is curtailed (estimate)", "Engineering checks and certificate requests in phase 0; PEA "
               "interconnection approval (3 to 6 months) filed alongside procurement; large float"]),
         ["Low", "Cassette supply chain", pick("Blank tape and shells come from few suppliers, once the lines "
@@ -389,11 +400,13 @@ def blocks():
             "This chapter prices **Plan A (~180M THB)**: the launch plant decided in October 2026, one Newbilt "
             "Duplex system and one Classic with the whole chain from the cutting room to the shrink wrapper, "
             "in one capital round and commissioned in sequence, brought down with six cost levers that keep "
-            "every machine. ",
+            "every machine. At the midpoint that is ~182M THB, **~2M above 180M** (section 8.2). ",
             "This chapter prices **Plan B (~215M THB)**: the launch plant decided in October 2026, one Newbilt "
             "Duplex system and one Classic with the whole chain from the cutting room to the shrink wrapper, "
             "in one capital round and commissioned in sequence, with everything in: none of Plan A's six cost "
             "levers taken. ") +
+          "In both plans the steam comes from biomass and PV sits on the factory roof only (~520 kWp; the "
+          "office roof and the canopies are built PV-ready), as decided on 17 October 2026. "
           "The plan price carries the ramp-up reserve, because that is cash the investor puts in, and **no "
           "contingency**. Blocks marked 'estimate' have no vendor confirmation; the rest trace to quotes, "
           "published prices or researched ranges. Treat all figures as budgetary with a wide margin (plus or "
@@ -416,7 +429,7 @@ def blocks():
               "The second Duplex system and further Classics are growth options with room reserved (hall "
               "floor, utility module positions, ring-main tees), not part of this plan.")),
         P("**Not in the plan price:** a contingency (the blocks are budgetary, so the plan carries no buffer "
-          "for quotes landing high; at 15 % it would be " + pick("~24M", "~30M") + " THB at the midpoint); CD "
+          "for quotes landing high; at 15 % it would be " + pick("~25M", "~30M") + " THB at the midpoint); CD "
           "replication (section 4.10); financing costs; currency moves; the mobile shelving for the father and "
           "mother archive (to quote); and the central hydraulic plant around the Newbilt aggregates (standby "
           "pump set, accumulator station, ring main), not costed yet, for a Thai hydraulic power unit builder "
@@ -424,37 +437,41 @@ def blocks():
           "promotion: without it, ~5 % duty on ~2.3M USD of imported machinery (~0.11M USD, the launch "
           "plant's estimate) comes on top, plus ~0.17M USD of import VAT paid at the border and reclaimed "
           "later (estimates)" + pick(
-              ". Plan A imports its boiler modules and buys less metrology at launch; the estimate is not "
-              "re-sized for either.",
+              ". Plan A buys less metrology at launch; the estimate is not re-sized for it.",
               ". Plan B is the launch plant that estimate was made for.")),
 
         H2("8.2 Two versions of this plan"),
         P("The lead investor asked in October 2026 whether the plant can be built for **180M THB (~5.45M USD), "
           "possibly up to 20 % more**. The answer is two versions of this plan, built from the same documents, "
           "both priced without contingency and with the ramp-up reserve: **Plan A** keeps every machine of "
-          "the launch plant and brings it to ~180M THB with six cost levers; **Plan B** builds the same "
-          "launch plant with everything in, none of the levers taken, at ~215M THB, just within 180M plus "
-          "20 % (216M). "
+          "the launch plant and brings it to ~180M THB with six cost levers, ~182M at the midpoint, which is "
+          "**~2M above 180M** (the low end of the reserve, 177M, fits); **Plan B** builds the same launch plant "
+          "with everything in, none of the levers taken, at ~215M THB: ~217M at the midpoint, ~0.6M above "
+          "180M plus 20 % (216M) and inside 225M. Both burn biomass for steam and carry PV on the factory roof "
+          "only. "
           "This document is " + label() + ". How the two differ (estimates):"),
         T(["Midpoints, estimates", "Plan A" + pick(" (this plan)", ""), "Plan B" + pick("", " (this plan)")], [
-            ["Plan price: ramp-up reserve in, no contingency", "~177M THB (~5.35M USD): ~180M",
-             "~216M THB (~6.53M USD): ~215M"],
-            ["Low to high end of every block", "~127M to 226M THB", "~156M to 275M THB"],
+            ["Plan price: ramp-up reserve in, no contingency", "~182M THB (~5.52M USD): ~180M, ~2M above "
+                                                               "180M at the midpoint",
+             "~217M THB (~6.56M USD): ~215M"],
+            ["Low to high end of every block", "~132M to 233M THB", "~156M to 277M THB"],
             ["Presses", "3: Duplex system 1 (two HRP 12) and one Classic", "The same 3"],
+            ["Steam and solar", "Biomass steam (two 500 kg/h modules); ~520 kWp on the factory roof through a "
+                                "solar PPA", "Biomass steam, the same; the ~520 kWp array and the battery owned"],
             ["Records a year at 60 % specials", "~0.58 to 0.90M, central 0.74M (Duplex-limited)", "The same"],
             ["Revenue, central", "3.65M USD (~120M THB)", "The same (cassette and CD-R not modelled)"],
-            ["EBITDA, central", "1.73M USD", "1.73M USD (calculator: 2.12M against Plan A's 2.05M, no PPA "
+            ["EBITDA, central", "1.73M USD", "1.73M USD (calculator: 2.23M against Plan A's 2.17M, no PPA "
                                             "power bill)"],
-            ["Operating profit, adverse case", "-0.39M USD: loses money", "-0.54M USD: loses more (more "
+            ["Operating profit, adverse case", "-0.41M USD: loses money", "-0.55M USD: loses more (more "
                                                                           "depreciation on the same EBITDA)"],
-            ["Payback on the plan price, central (EBITDA, mature year)", "~3.1 yr (2.2 to 4.0)",
-             "~3.8 yr (2.7 to 4.8; calculator: 2.9 yr against Plan A's 2.4)"],
-            ["What it gives up or takes on", "Six levers: solar through a PPA (a power bill of ~0.07M USD a "
+            ["Payback on the plan price, central (EBITDA, mature year)", "~3.2 yr (2.3 to 4.1)",
+             "~3.8 yr (2.7 to 4.9; calculator: 2.7 yr against Plan A's 2.3)"],
+            ["What it gives up or takes on", "Six levers: solar through a PPA (a power bill of ~0.06M USD a "
              "year), confocal and profiler from revenue, no tours at first, cassette and CD-R later, a "
-             "rented crane, Chinese boilers and compressor; the second Duplex waits for revenue", "No levers: "
-             "buys at launch what Plan A leases or defers, ~39M THB more (owned solar and battery, ~640 kWp on "
-             "every roof and canopy with no PPA bill, the full metrology stack, the visitor corridor, cassette "
-             "and CD-R, a bought crane, Thai boilers and compressor); the second Duplex waits for revenue"],
+             "rented crane, a Chinese compressor; the second Duplex waits for revenue", "No levers: "
+             "buys at launch what Plan A leases or defers, ~35M THB (~19 %) more (owned solar and battery, "
+             "~520 kWp on the factory roof with no PPA bill, the full metrology stack, the visitor corridor, "
+             "cassette and CD-R, a bought crane, a Thai compressor); the second Duplex waits for revenue"],
         ], widths_mm=[46, 62, 62], font_pt=8.5,
             caption="Estimates: docs/finance/total-investment.md 'Two plans' and docs/finance/revenue-model.md "
                     "'Operating pictures of Plan A and Plan B'. Section 9 has this plan's operating picture."),
@@ -462,11 +479,11 @@ def blocks():
             [P("**Plan A: six levers, every machine kept.** From the launch plant with every block, no "
                "contingency, midpoint values:"),
              _levers_table(),
-             P("Plan B takes none of these levers: it buys at launch what they lease or defer, ~39M THB more "
-               "at the midpoint, so ~200.6M THB before the reserve and ~216M (~215M THB) with it.")]
+             P("Plan B takes none of these levers: it buys at launch what they lease or defer, ~34.5M THB more "
+               "at the midpoint, so ~201.6M THB before the reserve and ~217M (~215M THB) with it.")]
             if a else
             [P("**Plan B: the launch plant with everything in, no levers.** What Plan B keeps that Plan A's six "
-               "cost levers lease, defer or source abroad, midpoint values:"),
+               "cost levers lease, defer or buy through the Chinese route, midpoint values:"),
              _keeps_table(),
              P("The plant itself is Plan A's: the same three presses, the same output and the same operating "
                "picture (section 9). The second Duplex system is a growth step from revenue in both plans, on a "
@@ -475,18 +492,21 @@ def blocks():
         CALL("What decides between Plan A and Plan B", [
             "**No longer demand.** Both plans are the same three presses making the same ~0.58 to 0.90 million "
             "records a year (central 0.74 million); market validation (section 14.1, item 1) gates both alike.",
-            "**~39M THB more at launch, for what Plan A leases or buys from revenue.** Plan B owns its array "
+            "**~35M THB more at launch, for what Plan A leases or buys from revenue.** Plan B owns its array "
             "and keeps the whole bill saving (no PPA bill), measures every stamper fully from the first release "
             "(the traceability pitch), opens tours and the Payap programmes from day one, sells cassette and "
-            "CD-R from the start, owns its crane and buys utilities with local service.",
+            "CD-R from the start, owns its crane and buys its compressor with local service. Steam is biomass "
+            "in both.",
             "**On the modelled numbers the extra earns little.** The same EBITDA in the revenue model (the "
-            "calculator puts Plan B ~0.07M USD a year ahead, the PPA bill its owned array avoids), more "
-            "depreciation, a longer payback (~3.8 against ~3.1 years) and a deeper adverse corner: Plan A has the better modelled "
+            "calculator puts Plan B ~0.06M USD a year ahead, the PPA bill its owned array avoids), more "
+            "depreciation, a longer payback (~3.8 against ~3.2 years) and a deeper adverse corner: Plan A has the better modelled "
             "return, Plan B the more complete plant. Most of Plan B's items can be added to Plan A later from "
             "revenue; the corridor is cheaper to have from the start, and every year the array is leased "
             "costs the PPA bill.",
             "**The quotes.** The Newbilt re-quote for the Classic and the EX 35, the Pheenix quote against the "
-            "OMS reference, the building quote with the soil test, and, for Plan A, the solar PPA offer.",
+            "OMS reference, the building quote with the soil test, and, for Plan A, the solar PPA offer and a "
+            "Chinese biomass boiler quote: ~2M THB or more below the Thai package would put Plan A back under "
+            "180M.",
             "**Neither price carries a contingency.** Quotes landing high are funded outside the plan price or "
             "by scope steps (section 8.4).",
             "**The second Duplex stays a growth step.** Its floor, utility module positions and ring-main "
@@ -496,10 +516,11 @@ def blocks():
           " preset, contingency kept out of the total as in this plan."),
         IMG(pick("renders/calculator/plan-a-budget.png", "renders/calculator/plan-b-budget.png"), 160,
             "Figure 11. Budget card of the plant and business plan calculator, " + pick(
-                "Plan A preset: 161.7M THB at the midpoint without contingency, 171.7M to 181.7M with the "
-                "ramp-up reserve of 10M to 20M, inside 180M at the midpoint",
-                "Plan B preset: 200.6M THB at the midpoint without contingency, 210.6M to 220.6M with the "
-                "ramp-up reserve of 10M to 20M, 9.4M to spare under the 225M mark (180M plus 25 %)") +
+                "Plan A preset: 167.1M THB at the midpoint without contingency, 177.1M to 187.1M with the "
+                "ramp-up reserve of 10M to 20M; against 180M it is 2.1M over at the midpoint, and it fits 225M "
+                "with 42.9M to spare",
+                "Plan B preset: 201.6M THB at the midpoint without contingency, 211.6M to 221.6M with the "
+                "ramp-up reserve of 10M to 20M, 8.4M to spare under the 225M mark (180M plus 25 %)") +
             ". Bars: the investment at the low end, the midpoint and the high end of every block, the reserve "
             "hatched, against 180M and 225M THB. Calculator figures (docs/fleet-calculator.html), estimates."),
 
@@ -514,10 +535,11 @@ def blocks():
         H2("8.4 What moves the number"),
         B([
             "**No contingency in the price.** " + pick(
-                "Plan A's ~177M THB is the midpoint of every block with the ramp-up reserve and no buffer: at "
-                "15 % a contingency would add ~24M THB, and the high end of every block comes to ~226M. ",
-                "Plan B's ~216M THB is the midpoint of every block with the ramp-up reserve and no buffer: at "
-                "15 % a contingency would add ~30M THB, and the high end of every block comes to ~275M. ") +
+                "Plan A's ~182M THB is the midpoint of every block with the ramp-up reserve and no buffer, ~2M "
+                "above 180M: at 15 % a contingency would add ~25M THB, and the high end of every block comes to "
+                "~233M. ",
+                "Plan B's ~217M THB is the midpoint of every block with the ramp-up reserve and no buffer: at "
+                "15 % a contingency would add ~30M THB, and the high end of every block comes to ~277M. ") +
             "Quotes landing above the midpoint are funded outside the plan price or by scope steps; how they are "
             "funded is a decision for the investor before commitment (section 14.2).",
             "**The quotes that decide it.** The Classic has no Newbilt price (its band is a placeholder "
@@ -526,7 +548,8 @@ def blocks():
                 "the EX 35 is priced only as the expired 2024 quote's second-extruder option; the building "
                 "depends on the soil; and the solar PPA lever depends on an offer. The Newbilt re-quote, the "
                 "Pheenix quote, the building request with a soil test, the metrology distributor quotes and "
-                "the PPA offers settle most of the band.",
+                "the PPA offers settle most of the band; a Chinese biomass boiler quote decides whether Plan A "
+                "comes back under 180M.",
                 "the EX 35 is priced only as the expired 2024 quote's second-extruder option; and the building "
                 "depends on the soil. The Newbilt re-quote, the Pheenix quote, the building request with a soil "
                 "test, the metrology distributor quotes and the solar and battery purchase quotes settle most of "
@@ -549,32 +572,56 @@ def blocks():
             "**The ground.** Soft paddy soil under the building, paving and fill platform is the single largest "
             "cost variable in the building package, and the cheapest to resolve: a soil boring test costs "
             "THB 30k to 50k.",
-            pick("**Chinese suppliers: taken where they pay.** Plan A buys the boiler modules and the "
-                 "compressor through the Chinese route (~1.9M THB at the midpoint, about 1 % of the price); the "
-                 "Newbilt hydraulic aggregates stay Newbilt's. Chillers and HVAC, the larger blocks, are not "
-                 "checked yet; that is the next Chinese lever to test.",
-                 "**Chinese suppliers: ~1 %.** Plan B prices Thai-supplied utilities. The Chinese route for the "
-                 "boiler modules and the compressor would take ~1.9M THB off at the midpoint (Plan A takes "
-                 "it); chillers and HVAC, the larger blocks, are not checked yet."),
-            pick("**Solar PPA.** The largest single lever (~17.5M THB at the midpoint) moves the array, ~640 kWp "
-                 "on every roof and canopy, and the battery off the capital budget and adds a power price to the "
-                 "energy line instead: ~760 MWh a year used on site at 3.0 THB/kWh, ~2.3M THB or ~0.07M USD a "
+            "**Biomass steam in both plans.** Steam comes from two 500 kg/h biomass modules (Getabec class, "
+            "6M to 10M THB installed with fuel feed, grate and dust control) and a fuel store with handling "
+            "(1.0M to 2.0M THB); the electric bank (Thai 4.5M to 7.0M, Chinese route 2.8M to 5.5M) is the "
+            "alternative, not the plan. At ~850k records the boilers burn ~460 t of fresh chips (or ~300 t of "
+            "air-dry wood) a year, ~0.67M THB at ~0.7 THB/kWh of heat, where electric steam would cost ~4.9M "
+            "THB in power and demand charge: **biomass saves ~4.2M THB (~0.13M USD) a year** (estimates; "
+            "biomass.md planning price 1.35 to 2 THB/kg delivered). Without electric boilers the grid demand "
+            "falls from ~980 kW to ~264 kW, so the transformer and the PEA deposit can be smaller (not "
+            "re-priced, an upside). It brings fuel contracts and a monsoon stock, ash handling, the 14 m flue "
+            "stack and dust collector, more maintenance and a certified boiler attendant (section 13). The "
+            "revenue model does not split energy by fuel; the calculator does (section 9.4).",
+            pick("**Chinese suppliers: the compressor now, a biomass boiler quote next.** Plan A buys the "
+                 "compressor through a Chinese brand's Thai office (~0.25M THB at the midpoint). The Chinese "
+                 "route priced only electric boiler modules; Chinese makers build biomass boilers too (ZOZEN "
+                 "DZL, Sitong DZL/SZL, Taiguo, Yongxing), none priced yet. **A quote ~2M THB or more below the "
+                 "Thai biomass package would put Plan A back under 180M**, so it is the first utilities request "
+                 "(section 14.1, item 10). The Newbilt hydraulic aggregates stay Newbilt's. Chillers and HVAC, "
+                 "the larger blocks, are not checked yet; that is the next Chinese lever to test.",
+                 "**Chinese suppliers: small so far.** Plan B prices Thai-supplied utilities. The Chinese route "
+                 "for the compressor would take ~0.25M THB off at the midpoint (Plan A takes it); Chinese "
+                 "biomass boilers are not priced yet; chillers and HVAC, the larger blocks, are not checked "
+                 "yet."),
+            pick("**Solar PPA.** The largest single lever (~14.7M THB at the midpoint) moves the array, ~520 kWp "
+                 "on the factory roof, and the battery off the capital budget and adds a power price to the "
+                 "energy line instead: ~633 MWh a year used on site at 3.0 THB/kWh, ~1.9M THB or ~0.06M USD a "
                  "year in the calculator, an estimate to quote (~21 % off the tariff; MEAei names 10 to 15 % as "
-                 "usual, CapSolar 10 to 30 %). The plant's bill (~0.75M THB a month before solar, estimate) "
-                 "is well above the 100,000 THB a month CapSolar asks of a PPA site.",
-                 "**Solar bought, not leased.** Plan B owns the array, ~640 kWp on every roof and canopy, and "
-                 "the 271 kWh battery: 14.8M to 20.1M THB (PV at 20 to 26 THB/W installed, inverters included; "
-                 "battery 2.0M to 3.5M). Factories on PEA's grid run zero export, so ~85 % of the ~900 MWh a "
-                 "year is used on site and the rest curtailed; the array saves ~2.8M to 3.0M THB a year and "
-                 "pays back in ~4.2 to 5.9 years (estimates). A solar PPA would take ~17.5M THB off the price "
-                 "at the midpoint and add a power price to the energy line instead: owned, the ~760 MWh used on "
-                 "site save the full ~3.8 THB/kWh; through a PPA at ~3.0 THB/kWh (estimate, to quote) only ~0.8 "
-                 "THB/kWh, so the PPA bill is ~2.3M THB (~0.07M USD) a year."),
-            "**The array follows the site.** ~640 kWp is what every roof and canopy carries on the Payap "
-            "scenario plot the calculator draws (factory roof ~523 kWp, office roof ~65 kWp, car and scooter "
-            "canopies ~54 kWp); on the Mueang Chi hall of section 6.2 the roof and canopies take ~300 kWp, and "
-            "the rest would need ground mount behind the building (which the rooftop permit exemption does not "
-            "cover) or the phase 2 roof (estimates).",
+                 "usual, CapSolar 10 to 30 %). The plant's bill with biomass steam (~0.36M THB a month before "
+                 "solar: ~1,036 MWh a year and ~264 kW of demand at the PEA tariff, our arithmetic, estimate) is "
+                 "well above the 100,000 THB a month CapSolar asks of a PPA site.",
+                 "**Solar bought, not leased.** Plan B owns the array, ~520 kWp on the factory roof, and the "
+                 "271 kWh battery: 12.4M to 17.0M THB (PV at 20 to 26 THB/W installed, inverters included, 10.4M "
+                 "to 13.5M; battery 2.0M to 3.5M). Factories on PEA's grid run zero export, so ~87 % of the ~730 "
+                 "to 780 MWh a year is used on site (~633 MWh in the calculator) and the rest curtailed; that "
+                 "covers ~61 % of the "
+                 "launch plant's ~1,036 MWh a year of electricity, saves ~2.3M to 2.5M THB a year and pays back "
+                 "in ~4.1 to 5.8 years (estimates). A solar PPA would take ~14.7M THB off the price at the "
+                 "midpoint and add a power price to the energy line instead: owned, the ~633 MWh used on site "
+                 "save the full ~3.7 THB/kWh; through a PPA at ~3.0 THB/kWh (estimate, to quote) only ~0.7 "
+                 "THB/kWh, so the PPA bill is ~1.9M THB (~0.06M USD) a year."),
+            "**The array is sized to the load, not to the roof area.** With biomass steam the plant's running "
+            "load is ~230 kW; an hourly sketch (two shifts on 300 days, ~60 kW off-shift base, the 271 kWh battery, the "
+            "PEA time-of-use tariff with Ft, 23,000 THB/kWp, 25 years at 8 %) puts the best array at **~500 to "
+            "550 kWp**: above ~550 kWp more of the yield is curtailed under zero export and the extra panels "
+            "lose money. The factory roof on the Payap scenario plot the calculator draws carries ~520 kWp "
+            "(~523 kWp in the site model), so PV goes there only. The office roof (~65 kWp) and the car and "
+            "scooter canopies (~54 kWp) are built PV-ready (structure rated for the panels, conduit to the "
+            "main board, a spare way for a later inverter), and ~120 kWp go on them when the load rises with "
+            "the second Duplex system, for ~2.4M to 3.1M THB at 20 to 26 THB/W. On the Mueang Chi hall of "
+            "section 6.2 the factory roof takes ~247 kWp, its canopies PV-ready too. ~430 kVA of inverters "
+            "stays under the ERC's 1,000 kVA line (estimates).",
             "**Every band narrows only with quotes.** The supplier map in the planning repository lists who to "
             "ask, and the re-quotes are phase 0 work (section 14).",
         ]),
@@ -723,21 +770,21 @@ def blocks():
           "the opposite; central takes midpoints. Cash overheads (admin, sales, insurance, facility running, "
           "IT, professional fees, marketing, the land lease) are estimated at USD 0.20M to 0.45M a year and "
           "paired high-to-adverse. Depreciation is on this plan's blocks: " + pick(
-              "the high end (6.25M USD) over 10 years (adverse), the midpoint (4.90M USD) over 12.5 years "
-              "(central) and the low end (3.56M USD) over 15 years (favourable). Payback is counted on the "
-              "whole plan price including the ramp-up reserve (3.86M / 5.35M / 6.85M USD from the low to the "
+              "the high end (6.44M USD) over 10 years (adverse), the midpoint (5.06M USD) over 12.5 years "
+              "(central) and the low end (3.68M USD) over 15 years (favourable). Payback is counted on the "
+              "whole plan price including the ramp-up reserve (3.99M / 5.52M / 7.05M USD from the low to the "
               "high end).",
-              "the high end (7.73M USD) over 10 years (adverse), the midpoint (6.08M USD) over 12.5 years "
+              "the high end (7.79M USD) over 10 years (adverse), the midpoint (6.11M USD) over 12.5 years "
               "(central) and the low end (4.42M USD) over 15 years (favourable). Payback is counted on the "
-              "whole plan price including the ramp-up reserve (4.72M / 6.53M / 8.34M USD from the low to the "
+              "whole plan price including the ramp-up reserve (4.73M / 6.56M / 8.40M USD from the low to the "
               "high end).")),
         _operating_table(),
         CALL("Reading this table honestly", pick([
-            "**The central case works on ~177M THB.** EBITDA ~1.7M USD (~57M THB) and operating profit ~1.3M "
+            "**The central case works on ~182M THB.** EBITDA ~1.7M USD (~57M THB) and operating profit ~1.3M "
             "USD (~44M THB) a year once the plant runs at volume. It breaks even on operating profit at about "
             "**0.2 million records a year, about a quarter of its central output**. Against the earlier ~20 % "
             "specials share (0.84M records, EBITDA 1.63M) more specials earn a higher price on fewer records.",
-            "**The adverse case loses money.** It would need ~0.9 million records to cover depreciation, and "
+            "**The adverse case loses money.** It would need ~1.0 million records to cover depreciation, and "
             "the three presses make 0.58 million at that rate. It stacks the low price, the high cost, the high "
             "capital and the high overheads at once. At the central cost and volume the price that covers "
             "depreciation is ~2.7 USD (~88 THB) a record (arithmetic on the table), below the low price "
@@ -748,18 +795,18 @@ def blocks():
             "above the reject allowance, sales commissions and the extra cost of specials. **Treat the adverse "
             "column as the honest one until those lines exist.** The plan price carries no contingency either.",
             "**This is a sensitivity, not a forecast.** The plant and business plan calculator's Plan A preset, "
-            "with its own cost build-up (it adds electric steam heat, the cutting engineer and the PPA power "
-            "price, ~0.07M USD a year, which this table leaves out) and the team's faster Duplex planning rate, "
-            "at which the three presses are not Duplex-limited, gives at 850k records and 60 % specials: "
-            "revenue ~4.14M, EBITDA 2.05M USD, payback 2.4 years on the 161.7M THB investment in a mature "
-            "year; with a ramp of 35, 70 and 90 % in the first three years and the reserve in year 0, cash "
-            "payback in year ~3.9, ~25 % IRR and an NPV of ~4.9M USD over ten years, pre-tax and "
-            "pre-financing (estimates). Not modelled here: cassette and CD-R lines (later in Plan A), stamper "
+            "with its own cost build-up (it adds the biomass fuel for the steam, ~0.67M THB a year, the cutting "
+            "engineer, and the PPA power price of ~0.06M USD a year, which this table leaves out) and the "
+            "team's faster Duplex planning rate, at which the three presses are not Duplex-limited, gives at "
+            "850k records and 60 % specials: revenue ~4.14M, EBITDA 2.17M USD, payback 2.3 years on the "
+            "167.1M THB investment in a mature year; with a ramp of 35, 70 and 90 % in the first three years "
+            "and the reserve in year 0, cash payback in year ~3.8, ~26 % IRR and an NPV of ~5.4M USD over ten "
+            "years, pre-tax and pre-financing (estimates). Not modelled here: cassette and CD-R lines (later in Plan A), stamper "
             "supply to other plants, automation services and the open plant stack for other pressing plants "
             "(section 5.6), dropshipping fees, and the ramp year. BOI tax exemptions shield part of "
             "early-year profits where there are any.",
         ], [
-            "**The central case works on ~216M THB.** EBITDA ~1.73M USD (~57M THB) and operating profit ~1.24M "
+            "**The central case works on ~217M THB.** EBITDA ~1.73M USD (~57M THB) and operating profit ~1.24M "
             "USD (~41M THB) a year once the plant runs at volume. It breaks even on operating profit at about "
             "**0.24 million records a year, about a third of its central output**. Against the earlier ~20 % "
             "specials share (0.84M records, EBITDA 1.63M) more specials earn a higher price on fewer records.",
@@ -769,33 +816,33 @@ def blocks():
             "cost and volume the price that covers depreciation is ~2.8 USD (~92 THB) a record (arithmetic on "
             "the table), below the low price assumed: price realisation and utilisation decide solvency, not "
             "upside.",
-            "**What the extra ~39M THB buys is not in this table.** Plan B is Plan A's plant with the six levers "
+            "**What the extra ~35M THB buys is not in this table.** Plan B is Plan A's plant with the six levers "
             "not taken, so revenue, direct cost and EBITDA are Plan A's; only the depreciation (0.49M against "
-            "Plan A's 0.39M USD at the centre) and the payback (~3.8 against ~3.1 years) move. Not modelled: "
+            "Plan A's 0.40M USD at the centre) and the payback (~3.8 against ~3.2 years) move. Not modelled: "
             "cassette and CD-R revenue, tour and Payap revenue, stamper supply to other plants, automation "
             "services and the open plant stack for other pressing plants (section 5.6), and the PPA power bill "
-            "the owned array avoids (~0.07M USD a year in the calculator).",
+            "the owned array avoids (~0.06M USD a year in the calculator).",
             "**The central margin is too good to trust yet.** A central EBITDA margin of ~47 % is far above "
             "the 15 to 25 % pressing plants earn. The direct cost table counts only per-record consumables and "
             "direct payroll and leaves out indirect labour (supervision, planning, warehouse), freight, scrap "
             "above the reject allowance, sales commissions and the extra cost of specials. **Treat the adverse "
             "column as the honest one until those lines exist.** The plan price carries no contingency either.",
             "**This is a sensitivity, not a forecast.** The plant and business plan calculator's Plan B preset, "
-            "with its own cost build-up (it adds electric steam heat and the cutting engineer, which this "
-            "table leaves out) and the team's faster Duplex planning rate, at which the three presses are not "
-            "Duplex-limited, gives at 850k records and 60 % specials: revenue ~4.14M, EBITDA 2.12M USD, "
-            "payback 2.9 years on the 200.6M THB investment in a mature year; with a ramp of 35, 70 and 90 % in "
-            "the first three years and the reserve in year 0, cash payback in year ~4.4, ~21 % IRR and an NPV "
-            "of ~4.1M USD over ten years, pre-tax and pre-financing (estimates). Its EBITDA is 0.07M above "
-            "Plan A's 2.05M because the owned array carries no PPA power price. Not modelled here: cassette "
+            "with its own cost build-up (it adds the biomass fuel for the steam, ~0.67M THB a year, and the "
+            "cutting engineer, which this table leaves out) and the team's faster Duplex planning rate, at "
+            "which the three presses are not Duplex-limited, gives at 850k records and 60 % specials: revenue "
+            "~4.14M, EBITDA 2.23M USD, payback 2.7 years on the 201.6M THB investment in a mature year; with a "
+            "ramp of 35, 70 and 90 % in the first three years and the reserve in year 0, cash payback in year "
+            "~4.2, ~22 % IRR and an NPV of ~4.7M USD over ten years, pre-tax and pre-financing (estimates). Its "
+            "EBITDA is 0.06M above Plan A's 2.17M because the owned array carries no PPA power price. Not modelled here: cassette "
             "and CD-R lines, stamper supply to other plants, automation services and the open plant stack for "
             "other pressing plants (section 5.6), dropshipping fees, and the ramp year. BOI tax "
             "exemptions shield part of early-year profits where there are any.",
         ])),
         IMG(pick("renders/calculator/plan-a-cash.png", "renders/calculator/plan-b-cash.png"), 160,
             "Figure 12. Ten years of cash in the plant and business plan calculator, " + pick(
-                "Plan A preset: cash payback in year ~3.9, IRR ~25 %, NPV ~4.9M USD at 10 %",
-                "Plan B preset: cash payback in year ~4.4, IRR ~21 %, NPV ~4.1M USD at 10 %") +
+                "Plan A preset: cash payback in year ~3.8, IRR ~26 %, NPV ~5.4M USD at 10 %",
+                "Plan B preset: cash payback in year ~4.2, IRR ~22 %, NPV ~4.7M USD at 10 %") +
             ". Year 0 is the midpoint investment plus the ramp-up reserve; years 1 to 3 sell 35, 70 and 90 % of "
             "the mature year's output. Pre-tax, pre-financing, no BOI tax holiday, no terminal value. The "
             "calculator's own cost build-up and faster Duplex planning rate, not the table above "
@@ -892,7 +939,8 @@ def blocks():
             ["Factory licence (Ror.Ngor. 4) with galvanics in the first licence", "First production, Q4 2028",
              "~4 months", "Galvanics effluent and hazardous-substance registration are now in the first "
              "licence scope: the most likely regulatory friction point; ZLD design in the application from "
-             "the start"],
+             "the start; the biomass boiler's registration and its air-emission limits go into the same permit "
+             "work (to confirm)"],
             pick(["Solar through the PPA (the installer builds and owns the array)", "Fit-out, ~Q2 2028",
                   "Large", "Not a risk; the PPA offer is phase 0 work; PEA interconnection approval takes 3 to "
                   "6 months, filed alongside procurement; battery lead time is 50 to 60 days"],
@@ -913,9 +961,7 @@ def blocks():
         P("**BOI windows are comfortable** on the August calendar: machinery clears customs ~Q3 2028 against a "
           "30-month import window ending ~Q4 2029 (~15 months of margin), and first production ~Q4 2028 "
           "against a ~36-month full-operation deadline (~18 months). The launch plant puts four vendors' "
-          "machines, not one, inside the import window" + pick(
-              ", and Plan A adds the Chinese boiler modules. ",
-              ". ") +
+          "machines, not one, inside the import window. " +
           "The margin is consumed by exactly one scenario: filing early to start the clock and then discovering "
           "the site does not work. Verify zoning before filing."),
         P("**The one lever worth six to nine months** is the BOI sequencing question in section 7: the duty "
@@ -947,18 +993,16 @@ def blocks():
              "between the Mueang Chi lease, other Payap land and the industrial estate; resolve the 35 % vs "
              "45 % humidity floor", "BOI filed"],
             ["2. Commit", "Incorporate under the certificate; sign the lease; order every long-lead item: "
-             "Pheenix galvanics line, Sillitoe lathe, Sibert line, " + pick(
-                 "Newbilt Duplex and Classic, first two boiler and chiller modules (boilers through the Chinese "
-                 "route)",
-                 "Newbilt Duplex and Classic, first two boiler and chiller modules (boilers and compressor "
-                 "from Thai suppliers)"), "BOI certificate and validated pricing"],
+             "Pheenix galvanics line, Sillitoe lathe, Sibert line, Newbilt Duplex and Classic, the two "
+             "biomass boiler modules and the first two chiller modules", "BOI certificate and validated "
+                                                                         "pricing"],
             ["3. Build and commission (~6 to 12 months after commitment)", pick(
-                "Construction, water-treatment building, utilities, HVAC, clean zones, security, the "
-                "crane-ready frame (a mobile crane for the installations); the solar array built by the PPA "
-                "installer; machinery installation and vendor commissioning; traceability and ERPNext live "
+                "Construction, water-treatment building, utilities (the biomass boilers and fuel store), HVAC, "
+                "clean zones, security, the crane-ready frame (a mobile crane for the installations); the "
+                "factory-roof solar array built by the PPA installer; machinery installation and vendor commissioning; traceability and ERPNext live "
                 "before the machines; hire and train",
-                "Construction, water-treatment building, utilities, HVAC, clean zones, solar and battery, "
-                "security, crane, visitor corridor; machinery installation and vendor commissioning; "
+                "Construction, water-treatment building, utilities (the biomass boilers and fuel store), HVAC, "
+                "clean zones, factory-roof solar and battery, security, crane, visitor corridor; machinery installation and vendor commissioning; "
                 "traceability and ERPNext live before the machines; hire and train"),
              "Building permit, vendor build dates confirmed"],
             ["4. Launch (the whole chain in-house)", "Commission in sequence (table below); test pressings, QC "
@@ -966,11 +1010,12 @@ def blocks():
              "compound", "Commissioning complete"],
             ["5. Expand (revenue-gated)", pick(
                 "Second Duplex system; further Classics; the laser confocal and wide-area profiler; the visitor "
-                "corridor and public tours; cassette and CD-R duplication; an owned crane if needed; the "
-                "biomass boiler if steam starts electric; the phase 2 building; CD replication if chosen",
+                "corridor and public tours; cassette and CD-R duplication; an owned crane if needed; PV on "
+                "the PV-ready office roof and canopies when the load rises; the phase 2 building; CD "
+                "replication if chosen",
                 "Second Duplex system, then further Duplex systems and Classics (the hall is laid out for five "
-                "Duplex bays and four Classic positions); the biomass boiler if steam starts electric; the "
-                "phase 2 building; CD replication if chosen"),
+                "Duplex bays and four Classic positions); PV on the PV-ready office roof and canopies when the "
+                "load rises; the phase 2 building; CD replication if chosen"),
              "Revenue and, for CD replication, a separate decision"],
         ], widths_mm=[42, 96, 32], font_pt=8.5),
         H2("11.1 Commissioning sequence"),
@@ -980,7 +1025,7 @@ def blocks():
                                          "First lacquers, fathers, mothers and stampers, and the metal archive "
                                          "from the first title"],
             ["2", "Newbilt Duplex system (two HRP 12, EX 50 and EX 35), with the steam and cooling plant "
-                  "(boiler modules B-1, B-2; chiller modules CH-1, CH-2)",
+                  "(biomass boiler modules B-1, B-2 with the fuel store; chiller modules CH-1, CH-2)",
              "The semi-automatic presses suit the colour, splatter and boutique runs that carry the premiums, "
              "and they teach the crews the process"],
             ["3", "Newbilt Classic, fully automatic", "Volume runs once the metal path and the press process "
@@ -1017,24 +1062,25 @@ def blocks():
              "the start, and on Payap land the lessor's consent as well."],
             ["**The cutting room is a smaller decision than it was.** The Sillitoe SDMS lists at USD 125k with "
              "automation in the box, and the Payap programmes in mastering and lathe cutting need a working "
-             "room.", pick("**More capital up front.** ~127M to 226M THB in one round (~177M at the "
+             "room.", pick("**More capital up front.** ~132M to 233M THB in one round (~182M at the "
                            "midpoint), against ~57M to 95M THB for the superseded phased entry; more of it is "
                            "committed before the market has validated the price.",
-                           "**More capital up front.** ~156M to 275M THB in one round (~216M at the midpoint), "
+                           "**More capital up front.** ~156M to 277M THB in one round (~217M at the midpoint), "
                            "against ~57M to 95M THB for the superseded phased entry; more of it is committed "
                            "before the market has validated the price.")],
-            pick(["**Six levers, no machine dropped.** The levers bring the whole chain to ~180M THB, and the "
+            pick(["**Six levers, no machine dropped.** The levers bring the whole chain to ~180M THB (~182M at "
+                  "the midpoint, ~2M above 180M; a Chinese biomass boiler quote could close the gap), and the "
                   "second Duplex waits for demand and revenue on a reserved floor.",
-                  "**What the levers give up.** Owned solar (a PPA bill of ~0.07M USD a year instead), public tours "
-                  "at first, cassette and CD-R at launch, a bought crane; the boilers are imported from China "
-                  "under the Thai boiler rules. The adverse case still loses money."],
-                 ["**Everything in at launch.** Owned solar on every roof and canopy (~640 kWp) with no PPA "
+                  "**What the levers give up.** Owned solar (a PPA bill of ~0.06M USD a year instead), public tours "
+                  "at first, cassette and CD-R at launch, a bought crane, a Thai-serviced compressor. The adverse "
+                  "case still loses money."],
+                 ["**Everything in at launch.** Owned solar on the factory roof (~520 kWp) with no PPA "
                   "bill, the full metrology stack "
                   "from the first release, tours and the Payap programmes from day one, cassette and CD-R, its "
-                  "own crane and locally serviced utilities; the second Duplex waits for demand and revenue on a "
+                  "own crane and a locally serviced compressor; the second Duplex waits for demand and revenue on a "
                   "reserved floor.",
-                  "**~39M THB more that the model does not repay.** The same EBITDA as Plan A with more "
-                  "depreciation and a longer payback (~3.8 against ~3.1 years); the adverse case still loses "
+                  "**~35M THB more that the model does not repay.** The same EBITDA as Plan A with more "
+                  "depreciation and a longer payback (~3.8 against ~3.2 years); the adverse case still loses "
                   "money."]),
         ], widths_mm=[85, 85], font_pt=8.5),
         P("**How the plan answers the risks:** commission the metal path first and measure it before the "
@@ -1087,7 +1133,7 @@ def blocks():
             "whose incentives are aligned with the plant's schedule and quality, within the same province.",
             "**Debt-to-equity no higher than 3:1**, maintained for the life of the BOI privileges, which sets "
             "the floor on equity in the financing mix: at least a quarter of the funding, " + pick(
-                "~44M THB of Plan A's ~177M", "~54M THB of Plan B's ~216M") +
+                "~46M THB of Plan A's ~182M", "~54M THB of Plan B's ~217M") +
             " (arithmetic, before financing costs).",
             "**A shareholders' agreement** covering board composition, reserved matters (capital calls and "
             "tranche releases, the growth options such as a second Duplex, CD replication), pre-emption and transfer, information rights, and the founders' roles and "
@@ -1133,7 +1179,8 @@ def blocks():
              "Payap R&D", "Simona", "USD 5k to 15k",
              "Sequencing, scope"],
             ["3", "Thai counsel: lease heads of terms (term, renewal, building ownership, assignment) and zoning "
-             "of the chosen plot for pressing, a steam boiler and electroplating; company and shareholder "
+             "of the chosen plot for pressing, a biomass steam boiler (with its air-emission limits) and "
+             "electroplating; company and shareholder "
              "structure including Ploy Printing", "Simona, counsel", "USD 5k to 15k", "Zoning, lease, "
                                                                                        "ownership"],
             ["4", "Soil boring test on the chosen plot", "Alexander", "THB 30k to 50k", "Ground risk"],
@@ -1148,32 +1195,37 @@ def blocks():
             ["8", "Sibert itemised quotation and order terms against the USD 250k budget: lead time, "
              "installation time, spares, shipping, travel", "Alexander", "Free", "Stamper prep, schedule"],
             ["9", "Building request for quotation to two or three Thai pre-engineered building contractors, "
-             "with the soil result", "Alexander", "Free", "Building estimate"],
+             "with the soil result and the office roof and canopies PV-ready", "Alexander", "Free",
+             "Building estimate"],
             ["10", pick(
-                "Utility requests: Chinese boiler makers for the plan's boiler modules (ZOZEN, Sitong, Fangkuai, "
-                "Taiguo; 1.25 MPa, ASME S stamp, electric and fired variants) with a Thai installer; compressors "
-                "from Kaishan and Denair's Thai offices; Thai suppliers for the rest; chillers and HVAC, Chinese "
-                "makers included; the 35 % vs 45 % humidity floor; a Thai hydraulic builder for the central "
-                "plant",
-                "Utility requests: Thai suppliers; Chinese boiler makers (ZOZEN, Sitong, Fangkuai, Taiguo; "
-                "1.25 MPa, ASME S stamp, electric and fired variants) and compressors from Kaishan and Denair's "
-                "Thai offices for comparison; chillers and HVAC, Chinese makers included; the 35 % vs 45 % "
-                "humidity floor; a Thai hydraulic builder for the central plant"),
-             "Alexander", "Free", "Utilities band, fuel choice"],
+                "Utility requests: biomass boiler packages from Getabec and from Chinese makers (ZOZEN, Sitong, "
+                "Taiguo, Yongxing; ASME S stamp, with a Thai installer), the Chinese quote first, because ~2M "
+                "THB or more below the Thai package puts Plan A back under 180M; electric modules as the "
+                "fallback quote; fuel supply offers (chips and wood, delivered price, a monsoon stock); "
+                "compressors from Kaishan and Denair's Thai offices; Thai suppliers for the rest; chillers and "
+                "HVAC, Chinese makers included; the 35 % vs 45 % humidity floor; a Thai hydraulic builder for "
+                "the central plant",
+                "Utility requests: biomass boiler packages from Getabec and, for comparison, Chinese makers "
+                "(ZOZEN, Sitong, Taiguo, Yongxing); electric modules as the fallback quote; fuel supply offers "
+                "(chips and wood, delivered price, a monsoon stock); Thai suppliers for the rest, compressors "
+                "from Kaishan and Denair's Thai offices for comparison; chillers and HVAC, Chinese makers "
+                "included; the 35 % vs 45 % humidity floor; a Thai hydraulic builder for the central plant"),
+             "Alexander", "Free", "Utilities band, fuel supply"],
             ["11", pick("Metrology distributor quotes (XRF, inline vision, audio station; confocal and profiler "
                         "for later)", "Metrology distributor quotes (XRF, confocal, profiler, inline vision, "
                                       "audio station)"), "Alexander", "Free", "Metrology band"],
-            ["12", pick("Solar PPA offers (the plan's lever) next to a purchase quote; the installer's battery "
-                        "and inverter design checked", "Solar and battery purchase quotes, with a PPA offer for "
-                                                           "comparison; battery and inverter engineering "
-                                                           "checks"), "Alexander", "Free",
+            ["12", pick("Solar PPA offers for the ~520 kWp factory roof (the plan's lever) next to a purchase "
+                        "quote; the installer's battery and inverter design checked", "Solar and battery purchase "
+                        "quotes for the ~520 kWp factory roof, with a PPA offer for comparison; battery and "
+                        "inverter engineering checks"), "Alexander", "Free",
              pick("Solar lever, PPA price", "Solar block")],
             ["13", pick("Cassette and CD-R equipment quotes from two vendors each, for the growth step; tape and "
                         "shell supply", "Cassette and CD-R equipment quotes from two vendors each; tape and "
                                         "shell supply"), "Alexander", "Free", "New-scope estimates"],
             ["14", "Search for the galvanics process engineer and the cutting engineer; next meeting with Payap "
              "on the programmes", "Simona, Alexander", "None yet", "Skills risk"],
-            ["15", "60 rai title check for the coppice plan", "Simona", "Small", "Biomass path"],
+            ["15", "60 rai title check for own fuelwood (the coppice plan)", "Simona", "Small",
+             "Own fuel later, an upside"],
             ["16", "Optional: vinyl manufacturing consultancy for a layout and installation review",
              "Alexander", "GBP 10k to 20k", "Layout risk"],
             ["17", "Archive the Thai invoices and tour notes with this plan", "Simona", "None", "Evidence base"],
@@ -1183,44 +1235,46 @@ def blocks():
             ["Now", "Approval of Phase 0 spending of ~USD 40k to 80k (~1.3M to 2.6M THB, part of the plan "
                     "price), so the quotes, the soil test, the BOI consultant and counsel can start."],
             ["On the gates clearing", pick(
-                "A commitment in principle to **Plan A at ~180M THB** (~177M at the midpoint, the ramp-up "
+                "A commitment in principle to **Plan A at ~180M THB** (~182M at the midpoint, the ramp-up "
                 "reserve of 10M to 20M included, no contingency), released in the tranches of section 8.3, "
-                "with the financing mix set to hold debt-to-equity at or below 3:1 (equity of at least ~44M "
-                "THB). Told plainly: the price carries no contingency (at 15 % it would be ~24M THB more at "
-                "the midpoint), and from the low to the high end of every block the plan comes to ~127M to "
-                "226M THB. The Newbilt re-quote, the Pheenix quote, the building quote with the soil test, "
-                "the metrology quotes and the solar PPA offer decide where in that range it lands.",
-                "A commitment in principle to **Plan B at ~215M THB** (~216M at the midpoint, the ramp-up "
+                "with the financing mix set to hold debt-to-equity at or below 3:1 (equity of at least ~46M "
+                "THB). Told plainly: at the midpoint the plan is **~2M above 180M** (177M to 187M with the "
+                "reserve's 10M to 20M); the price carries no contingency (at 15 % it would be ~25M THB more at "
+                "the midpoint), and from the low to the high end of every block the plan comes to ~132M to "
+                "233M THB. The Newbilt re-quote, the Pheenix quote, the building quote with the soil test, "
+                "the metrology quotes, the solar PPA offer and a Chinese biomass boiler quote decide where in "
+                "that range it lands and whether it comes back under 180M.",
+                "A commitment in principle to **Plan B at ~215M THB** (~217M at the midpoint, the ramp-up "
                 "reserve of 10M to 20M included, no contingency), released in the tranches of section 8.3, "
                 "with the financing mix set to hold debt-to-equity at or below 3:1 (equity of at least ~54M "
                 "THB). Told plainly: the price carries no contingency (at 15 % it would be ~30M THB more at "
                 "the midpoint), and from the low to the high end of every block the plan comes to ~156M to "
-                "275M THB. The Newbilt re-quote, the Pheenix quote, the building quote with the soil test, "
+                "277M THB. The Newbilt re-quote, the Pheenix quote, the building quote with the soil test, "
                 "the metrology quotes and the solar and battery purchase quotes decide where in that range it "
                 "lands.")],
             ["Decisions", pick(
                 "The equity and debt mix, and how quotes landing above the plan price are funded; the six "
-                "levers, the solar PPA first (~17.5M THB off the price for a power bill of ~0.07M USD a year); "
-                "CD replication, "
-                "yes or no, before the BOI application is finalised; the steam fuel (electric or biomass); "
+                "levers, the solar PPA first (~14.7M THB off the price for a power bill of ~0.06M USD a year); "
+                "whether to buy a Chinese biomass boiler if its quote brings the plan under 180M; CD "
+                "replication, yes or no, before the BOI application is finalised; the biomass fuel contracts; "
                 "the shareholder structure with Ploy Printing and the founders; hedging of the EUR orders.",
-                "The equity and debt mix, and how quotes landing above the plan price are funded; the ~39M "
-                "THB of items Plan A leases or defers (owned solar on every roof and canopy with no PPA bill, "
-                "the full "
-                "metrology stack, the visitor corridor, cassette and CD-R, the bought crane, Thai boilers and "
+                "The equity and debt mix, and how quotes landing above the plan price are funded; the ~35M "
+                "THB of items Plan A leases or defers (owned solar on the factory roof with no PPA bill, the "
+                "full metrology stack, the visitor corridor, cassette and CD-R, the bought crane, the Thai "
                 "compressor), each weighed against its lever; CD replication, yes or no, before the BOI "
-                "application is finalised; the steam fuel (electric or biomass); the shareholder structure "
+                "application is finalised; the biomass fuel contracts; the shareholder structure "
                 "with Ploy Printing and the founders; hedging of the EUR orders.")],
             ["Later", pick(
                 "Revenue-funded growth: the second Duplex system (~USD 230k to 300k for the press system; "
                 "~15.4M THB at the midpoint with its chiller module, freight and working capital, estimate), "
                 "the laser confocal and wide-area profiler (USD 180k to 350k), the visitor "
-                "corridor, cassette and CD-R, an owned crane if needed, further Classics, the biomass boiler "
-                "if steam starts electric, and the phase 2 building.",
+                "corridor, cassette and CD-R, an owned crane if needed, further Classics, PV on the PV-ready "
+                "office roof and canopies (~120 kWp, ~2.4M to 3.1M THB, estimate), and the phase 2 building.",
                 "Revenue-funded growth: the second Duplex system (~USD 230k to 300k for the press system; "
                 "~15.4M THB at the midpoint with its chiller module, freight and working capital, estimate), "
                 "then further Duplex systems and Classics in the hall laid out for five Duplex bays and four "
-                "Classic positions; the biomass boiler if steam starts electric; and the phase 2 building.")],
+                "Classic positions; PV on the PV-ready office roof and canopies (~120 kWp, ~2.4M to 3.1M THB, "
+                "estimate); and the phase 2 building.")],
         ], widths_mm=[38, 132]),
         P("The next version of this plan should carry: the Newbilt, Pheenix, Sillitoe and Sibert quotes with "
           "their build times in place of the placeholder and estimated blocks; the building quote with the "
@@ -1228,7 +1282,8 @@ def blocks():
                                  "its price; ",
                                  "the BOI consultant's reading on the battery (battery storage, capped at 12M THB "
                                  "per MW); ") +
-          "the negotiated lease; a buyer-side price data point; the investor's CD and fuel decisions; how "
+          "the negotiated lease; a buyer-side price data point; the investor's CD decision; the biomass boiler "
+          "quotes (Getabec and a Chinese maker) and fuel supply offers; how "
           "overruns are funded, since the price carries no contingency; a calendar re-drawn for the launch "
           "plant with the metal-path commissioning in it; a year-by-year cash model for the ramp; and the "
           "shareholder terms. Each of those is a phase 0 output."),
@@ -1252,8 +1307,10 @@ def blocks():
             ["finance/revenue-model.md", "Pricing, the Thai market data and factory tour, the Record Industry "
                                          "benchmark, direct cost, the launch-plant operating picture and the "
                                          "operating pictures of Plan A and Plan B"],
-            ["finance/utilities-investment.csv", "Thai supplier candidates and budgetary ranges for steam, "
-                                                 "cooling, air, water, HVAC, solar and battery"],
+            ["finance/utilities-investment.csv", "Thai supplier candidates and budgetary ranges for steam "
+                                                 "(the biomass package and the fuel store; the electric bank "
+                                                 "as the alternative), cooling, air, water, HVAC, solar and "
+                                                 "battery"],
             ["finance/phase1-construction-rfq.md", "Contractor price request with quantities from the "
                                                    "parametric model"],
             ["fleet-calculator.html", "Plant and business plan calculator: target output and specials share to "
@@ -1272,8 +1329,9 @@ def blocks():
                                                                       "contacts"],
             ["suppliers/making-vinyl-europe-2026-exhibitors.md", "Making Vinyl Europe 2026 briefing and what "
                                                                  "came after the show"],
-            ["suppliers/china-utilities.md", "Chinese boilers, compressed air and hydraulics; Thai rules for "
-                                             "imported boilers; what the Chinese route saves"],
+            ["suppliers/china-utilities.md", "Chinese boilers (electric priced; biomass makers named, not "
+                                             "priced), compressed air and hydraulics; Thai rules for imported "
+                                             "boilers; what the Chinese route saves"],
             ["digital-factory.md (demos plant-operation.html, factory-console.html)", "Data platform: ERPNext "
                                    "as the only system of record, machine data, the factory application, the "
                                    "NixOS fleet; the plant overview and factory console demos (Figures 2 to 4)"],
@@ -1291,11 +1349,18 @@ def blocks():
                                                         "stage, lead times and the repress path"],
             ["traceability.md, quality-automation.md", "The traceability specification; metrology, layered "
                                                        "record QC, the materials lab"],
-            ["sustainability.md, biomass.md, steam-cooling.html", "Solar, heat recovery, water, zero discharge, "
-                                                                  "the grid tariff; the biomass fuel strategy; "
-                                                                  "the steam and cooling plant"],
-            ["sustainability.md ('What ~640 kWp means on the grid'), finance/utilities-investment.csv (solar "
-             "rows), boi.md", "Solar on every roof and canopy (~640 kWp) and its sources: the installed price of "
+            ["sustainability.md, steam-cooling.html", "Solar, heat recovery, water, zero discharge, the grid "
+                                                      "tariff; the steam and cooling plant"],
+            ["biomass.md", "Biomass steam for both plans: what the boilers burn (~300 t of air-dry wood or ~460 t "
+                           "of fresh chips a year at ~850k records), the fuel prices (1.35 to 2 THB/kg delivered, "
+                           "0.5 to 0.9 THB/kWh of heat; sources in finance/biomass/), the northern fuel market, "
+                           "the 60 rai of own fuelwood and its title check, logistics on site (fuel store, ash)"],
+            ["sustainability.md ('PV size with biomass steam', the hourly PV sizing sketch), "
+             "finance/utilities-investment.csv "
+             "(solar rows), boi.md", "PV on the factory roof (~520 kWp; the office roof and the canopies "
+             "PV-ready) and its sources: the hourly sizing sketch (two shifts, 300 days, the 271 kWh battery, "
+             "PEA time-of-use with Ft, 23,000 THB/kWp over 25 years at 8 %: best array ~500 to 550 kWp, "
+             "estimate); the installed price of "
              "20 to 26 THB/W (DEDE's Thailand PV Status survey, CapSolar 2026, Saimai Solar's 2026 list); zero "
              "export for factories on PEA's grid (CapSolar, rooftop solar regulations, 2026; Sahawatthanakit, "
              "2026); the permits (Ministerial Regulation No. 3 B.E. 2567, in force 28 December 2024; ERC's "

docs/finance/phase1-construction-rfq.md

@@ -161,7 +161,7 @@ PIR.
 | Paving — heavy duty | **1,608 m²** rigid reinforced concrete for laden trucks: truck apron, dock face, internal circulation road, Phase 2 link |
 | Paving — general | **2,779 m²** lighter hardstanding: car park, yard and margins |
 | **Paving total** | **4,387 m²** — see note below |
-| Car/scooter parking | Roofed canopies: **27.7 × 7.0 m (195 m², 10 cars)** + **13.7 × 5.5 m (76 m², 30 scooters)**, steel canopy carrying **~40 kWp** PV |
+| Car/scooter parking | Roofed canopies: **27.7 × 7.0 m (195 m², 10 cars)** + **13.7 × 5.5 m (76 m², 30 scooters)**, steel canopy built **PV-ready** for ~40 kWp (structure for the panels' dead load and uplift, conduit to the main board); panels later, not in this contract |
 | Guard house | **12 m² (4 × 3 m)**, insulated/AC'd, with toilet; sited at the gate, north-west side |
 | Tank foundations | Ring foundation for a **9 m dia × 4 m** fire water tank (**~250 m³, ~250 t full** — the geometry gives 254 m³ gross; if 200 m³ usable with freeboard is intended, the foundation still carries the full 250 t) sited in the **north-west corner of the plot**, with the **fire pump house adjacent to it**; plus a **5 m dia × 3 m** raw water tank. Tanks themselves are vendor-supplied bolted panels — foundations only |
 | Fire main | Ring main runs from the north-west corner to the buildings — quote the **length**, not just "a ring main" |

docs/finance/revenue-model.md

@@ -670,23 +670,24 @@ What it says:
 
 The business plan comes in two versions
 ([total investment](total-investment.md#two-plans-a-at-180m-thb-and-b-at-215m-thb-october-2026)):
-**Plan A** (~177M THB, the launch plant with six cost levers) and
-**Plan B** (~216M THB, the same launch plant with everything in), both
-priced without contingency and with the ramp-up reserve. Both run the
+**Plan A** (~182M THB, the launch plant with six cost levers) and
+**Plan B** (~217M THB, the same launch plant with everything in), both
+priced without contingency and with the ramp-up reserve, both on biomass
+steam with PV on the factory roof (October 2026). Both run the
 same three presses, so volume, price, direct cost, title services and
 overheads are those of the launch-plant table above; only the
 depreciation follows each plan's capital (estimates):
 
-- **Plan A**: the high end of its blocks (6.25M USD) over 10 years, the
-  midpoint (4.90M USD) over 12.5, the low end (3.56M USD) over 15. The
-  solar PPA adds its power price to the energy line (~0.07M USD a year in
-  the calculator for the ~640 kWp array), not shown here.
-- **Plan B**: 7.73M USD over 10 years, 6.08M over 12.5, 4.42M over 15.
-  Its owned solar (~640 kWp, every roof and canopy) saves the PPA power bill; cassette and CD-R sales, tours
+- **Plan A**: the high end of its blocks (6.44M USD) over 10 years, the
+  midpoint (5.06M USD) over 12.5, the low end (3.68M USD) over 15. The
+  solar PPA adds its power price to the energy line (~0.06M USD a year in
+  the calculator for the ~520 kWp factory roof), not shown here.
+- **Plan B**: 7.79M USD over 10 years, 6.11M over 12.5, 4.42M over 15.
+  Its owned solar (~520 kWp on the factory roof) saves the PPA power bill; cassette and CD-R sales, tours
   and the Payap programmes it opens from the start are not modelled.
 - **Payback** is counted on the whole plan price including the ramp-up
-  reserve (Plan A 3.86M / 5.35M / 6.85M USD, Plan B 4.72M / 6.53M /
-  8.34M USD from the low to the high end).
+  reserve (Plan A 3.99M / 5.52M / 7.05M USD, Plan B 4.73M / 6.56M /
+  8.40M USD from the low to the high end).
 
 | USD/yr | A adverse | A central | A favourable | B adverse | B central | B favourable |
 |---|---|---|---|---|---|---|
@@ -697,23 +698,23 @@ depreciation follows each plan's capital (estimates):
 | Title-services contribution | 0.07M | 0.23M | 0.48M | 0.07M | 0.23M | 0.48M |
 | Cash overheads | 0.45M | 0.33M | 0.20M | 0.45M | 0.33M | 0.20M |
 | **EBITDA** | **0.23M** | **1.73M** | **3.79M** | **0.23M** | **1.73M** | **3.79M** |
-| Depreciation | 0.62M | 0.39M | 0.24M | 0.77M | 0.49M | 0.29M |
-| **Operating profit** | **-0.39M** | **1.34M** | **3.55M** | **-0.54M** | **1.24M** | **3.50M** |
+| Depreciation | 0.64M | 0.40M | 0.25M | 0.78M | 0.49M | 0.29M |
+| **Operating profit** | **-0.41M** | **1.33M** | **3.54M** | **-0.55M** | **1.24M** | **3.50M** |
 | Revenue | 2.28M (~75M THB) | 3.65M (~120M THB) | 5.41M (~179M THB) | 2.28M (~75M THB) | 3.65M (~120M THB) | 5.41M (~179M THB) |
-| Payback on the plan price (EBITDA, mature year) | ~30 yr | ~3.1 yr (2.2 to 4.0) | ~1.0 yr | ~36 yr | ~3.8 yr (2.7 to 4.8) | ~1.2 yr |
+| Payback on the plan price (EBITDA, mature year) | ~31 yr | ~3.2 yr (2.3 to 4.1) | ~1.1 yr | ~37 yr | ~3.8 yr (2.7 to 4.9) | ~1.2 yr |
 
 What it says:
 
 - **Plan A** breaks even on operating profit at **~0.2 million records a
   year**; its adverse corner still loses money, because it would need
-  ~0.9 million records to cover depreciation and the three presses make
+  ~1.0 million records to cover depreciation and the three presses make
   0.58 million at that rate.
 - **Plan B** breaks even at **~0.24 million records**, and its adverse
   corner loses more (~1.1 million records needed to cover depreciation).
   At the central cost and volume the price that covers its depreciation
   is ~2.8 USD (~92 THB) a record.
-- **On these numbers Plan B's extra ~39M THB earns little**: the same
-  EBITDA here (the calculator, which splits energy by plan, puts it ~0.07M
+- **On these numbers Plan B's extra ~35M THB earns little**: the same
+  EBITDA here (the calculator, which splits energy by plan, puts it ~0.06M
   USD a year ahead for the PPA bill the owned array avoids), more
   depreciation and a longer payback. Its case rests on what
   the table leaves out: the PPA power bill it avoids (the BOI no longer
@@ -726,11 +727,13 @@ What it says:
 
 The [calculator](../fleet-calculator.html) presets, at the team's
 planning rates (3 records a minute per Duplex system) and its own cost
-build-up, give at 850k records: **Plan A** EBITDA 2.05M USD, payback 2.4
-years on the investment, cash payback in year ~3.9 and ~25 % IRR over ten
-years with the reserve in year 0; **Plan B** EBITDA 2.12M USD, payback 2.9
-years, cash payback in year ~4.4 and ~21 % IRR (pre-tax, pre-financing,
-estimates).
+build-up, give at 850k records: **Plan A** EBITDA 2.17M USD, payback 2.3
+years on the investment, cash payback in year ~3.8 and ~26 % IRR over ten
+years with the reserve in year 0; **Plan B** EBITDA 2.23M USD, payback 2.7
+years, cash payback in year ~4.2 and ~22 % IRR (pre-tax, pre-financing,
+estimates). Both rose ~0.11M to 0.12M USD a year when steam moved from electric to
+biomass (~4.2M THB a year less energy); the table above does not split
+energy by fuel, so it does not show that saving.
 
 ## Operating picture at full capacity (five-press fleet)
 

docs/finance/total-investment.md

@@ -51,7 +51,7 @@ on two shifts (estimate: the [scale](../scale.md) basis gives ~0.71 to
 | Cutting room: Sillitoe SDMS, spare cutterhead and support, mastering console and chain, monitoring, room build-out | 200k – 350k | 6.6M – 11.6M | SDMS list price USD 125k (ex tax and shipping); the rest estimate |
 | Metrology and QC stack (XRF, laser confocal, wide-area profiler, inline vision on three presses, audio station) | 350k – 810k | 11.6M – 26.7M | estimate, phaseable ([quality automation](../quality-automation.md)) |
 | PVC lab, day-one tier | 55k – 150k | 1.8M – 5.0M | estimate, [quality automation](../quality-automation.md) |
-| Utilities, solar, battery, HVAC, clean zones, racking | 1,042k – 1,707k | 34.4M – 56.3M | [utilities CSV](utilities-investment.csv) baseline re-sized for three presses: chiller bank two modules instead of three; PV on every roof and canopy (~640 kWp, user decision 17 October 2026) at 20 to 26 THB/W installed and the battery installed (Thai market prices checked October 2026, sources in the CSV) |
+| Utilities, steam, solar, battery, HVAC, clean zones, racking | 1,045k – 1,764k | 34.5M – 58.2M | [utilities CSV](utilities-investment.csv) baseline re-sized for three presses: chiller bank two modules instead of three; **biomass steam** (two 500 kg/h modules, 6M to 10M THB, plus the fuel store and handling, 1M to 2M) and **PV on the factory roof** (~520 kWp at 20 to 26 THB/W installed; office roof and parking canopies PV-ready), both user decisions of 17 October 2026; the battery installed (Thai market prices checked October 2026, sources in the CSV) |
 | Building ~1,500 m² plus civil and site works | 650k – 1,100k | 21.4M – 36.3M | estimate at 12,000 – 20,000 THB/m² plus ~20 % site works; soil is the main variable |
 | Overhead crane, runway, frame premium, machine door | 97k – 227k | 3.2M – 7.5M | estimate, [crane, workshop and tours](../crane-workshop-tours.md) |
 | Maintenance workshop and machine bay fit-out | 30k – 76k | 1.0M – 2.5M | estimate, same |
@@ -61,9 +61,9 @@ on two shifts (estimate: the [scale](../scale.md) basis gives ~0.71 to
 | Cassette duplication and CD-R duplication | 55k – 190k | 1.8M – 6.3M | estimate, business plan sections 4.8 and 4.9 |
 | Freight, installation, commissioning, training (Pheenix, Sibert, Sillitoe, Newbilt beyond its quoted 5 days) | 150k – 300k | 5.0M – 9.9M | estimate |
 | Working capital, PVC stock, spares, lease deposit, first-year rent | 135k – 290k | 4.5M – 9.6M | estimate; land is leased, so no land purchase |
-| Subtotal | ~4.42M – 7.73M | ~146M – 255M | midpoint ~6.08M USD, ~201M THB |
-| Contingency 15 % | ~0.66M – 1.16M | ~22M – 38M | |
-| **Total, launch plant** | **~5.1M – 8.9M USD** | **~168M – 294M THB** | midpoint ~6.99M USD, ~231M THB |
+| Subtotal | ~4.42M – 7.79M | ~146M – 257M | midpoint ~6.11M USD, ~202M THB |
+| Contingency 15 % | ~0.66M – 1.17M | ~22M – 39M | |
+| **Total, launch plant** | **~5.1M – 9.0M USD** | **~168M – 296M THB** | midpoint ~7.02M USD, ~232M THB |
 
 Not in the total: a **reserve for the ramp-up** (staff hired before first
 revenue, overheads until volume covers them; ~10M to 20M THB, estimate),
@@ -144,11 +144,20 @@ versions** for the investor, built from the same documents:
   First drawn as five presses at ~225M THB (Plan A plus 25 %); re-defined
   by the user on 17 October 2026 ("plan b should also only start with 1
   duplex and 1 classic, but with all levers"). In both plans the second
-  Duplex system is a growth step from revenue. On 17 October 2026 the
-  solar array was sized to every roof and canopy (~640 kWp, "use as much
-  roof space as possible"); that raised Plan B from ~208M to ~216M and
-  Plan A's solar lever from ~9.7M to ~17.5M, and left Plan A's price as
-  it was, because Plan A leases the array.
+  Duplex system is a growth step from revenue.
+- **Both run on biomass steam, with PV on the factory roof only**
+  (user, 17 October 2026: "only put solar on the factory, prepare the
+  other buildings for solar, option a and b should operate on biomass").
+  The office roof and the parking canopies are built PV-ready. With
+  biomass the plant's running load falls to ~230 kW, so the best array
+  is ~500 to 550 kWp ([sustainability](../sustainability.md#pv-size-with-biomass-steam)),
+  about the ~520 kWp factory roof. Against the earlier electric steam
+  and ~640 kWp, in Plan B the biomass boilers and fuel store add ~3.8M
+  at the midpoint over the Thai electric bank and the smaller array saves
+  ~2.8M, so it rises from ~216M to **~217M**; Plan A leases the array and
+  had the cheaper Chinese electric boilers, so it takes the full ~5.4M,
+  from ~177M to **~182M**. Biomass saves ~4.2M THB a year of steam energy
+  (calculator).
 
 Both are priced **without contingency** (user decision) and **with the
 ramp-up reserve**, because the reserve is cash the investor puts in
@@ -157,26 +166,26 @@ reference plus 20 % in both. Midpoints, estimates:
 
 | Plan A: launch plant with six levers | Saves | Subtotal after it |
 |---|---|---|
-| Launch plant, every block, no contingency | | ~200.6M THB (~6.08M USD) |
-| Solar (~640 kWp on every roof and canopy) and battery through a solar PPA (the installer owns and finances the array, the plant buys the power) | ~17.5M | ~183.1M |
-| Metrology launch tier: XRF, inline vision and audio station at launch; laser confocal and wide-area profiler (USD 180k to 350k) bought from revenue | ~8.8M | ~174.4M |
-| Visitor corridor built later; no public tours at first | ~3.6M | ~170.8M |
-| Cassette and CD-R duplication later | ~4.0M | ~166.8M |
-| Crane rented for the installations; frame, runway and machine door stay crane-ready | ~3.2M | ~163.6M |
-| Boilers and compressor through the Chinese route ([Chinese suppliers](../suppliers/china-utilities.md)) | ~1.9M | **~161.7M (~4.90M USD)** |
+| Launch plant, every block, no contingency | | ~201.6M THB (~6.11M USD) |
+| Solar (~520 kWp on the factory roof) and battery through a solar PPA (the installer owns and finances the array, the plant buys the power) | ~14.7M | ~186.9M |
+| Metrology launch tier: XRF, inline vision and audio station at launch; laser confocal and wide-area profiler (USD 180k to 350k) bought from revenue | ~8.8M | ~178.1M |
+| Visitor corridor built later; no public tours at first | ~3.6M | ~174.5M |
+| Cassette and CD-R duplication later | ~4.0M | ~170.5M |
+| Crane rented for the installations; frame, runway and machine door stay crane-ready | ~3.2M | ~167.3M |
+| Compressor through the Chinese route ([Chinese suppliers](../suppliers/china-utilities.md)); the route priced only electric boilers, so with biomass it saves only the compressor | ~0.25M | **~167.1M (~5.06M USD)** |
 | Ramp-up reserve | | +10M to 20M |
-| **Plan A** | | **~177M THB (~5.35M USD)**, ~127M to 226M from the low to the high end of every block |
+| **Plan A** | | **~182M THB (~5.52M USD)**, ~2M above 180M at the midpoint (177M with the reserve's low end); ~132M to 233M from the low to the high end of every block |
 
 | Plan B: the launch plant, everything in | USD | THB |
 |---|---|---|
-| Launch plant, every block, no contingency (the six lever items included: owned solar (~640 kWp) and battery ~17.5M, full metrology ~8.8M, visitor corridor ~3.6M, cassette and CD-R ~4.0M, bought crane ~3.2M, Thai boilers and compressor ~1.9M, together ~39M THB at the midpoint) | 4.42M – 7.73M | ~146M – 255M, **~200.6M (~6.08M USD)** at the midpoint |
+| Launch plant, every block, no contingency (the six lever items included: owned solar (~520 kWp) and battery ~14.7M, full metrology ~8.8M, visitor corridor ~3.6M, cassette and CD-R ~4.0M, bought crane ~3.2M, Thai compressor ~0.25M, together ~34.5M THB at the midpoint) | 4.42M – 7.79M | ~146M – 257M, **~201.6M (~6.11M USD)** at the midpoint |
 | Ramp-up reserve | | +10M to 20M |
-| **Plan B** | | **~216M THB (~6.53M USD): ~215M**, ~156M to 275M from the low to the high end of every block |
+| **Plan B** | | **~217M THB (~6.56M USD): ~215M**, ~156M to 277M from the low to the high end of every block |
 
-Plan B costs ~39M THB (~22 %) more than Plan A and, at the midpoint,
-stays just within the investor's 180M THB plus 20 % (216M; its high end,
-~275M, does not). It keeps what Plan A leases or defers:
-owned solar on every roof and canopy and the battery, the full
+Plan B costs ~35M THB (~19 %) more than Plan A and, at the midpoint,
+sits ~0.6M above the investor's 180M THB plus 20 % (216M) and 8.4M under
+the 225M mark (its high end, ~277M, is above both). It keeps what Plan A leases or defers:
+owned solar on the factory roof and the battery, the full
 metrology stack from the first release, the visitor corridor and tours
 from the start, cassette and CD-R, the bought crane, Thai-supplied
 utilities with local service. Both plans have the same three presses and
@@ -189,17 +198,17 @@ both as presets.
 **Not in either plan price:**
 - **Contingency.** The blocks are budgetary (plus or minus 30 to 50 % on
   the estimates, top of this page), so the plans carry no buffer for
-  quotes landing high. At this page's 15 % that would be ~24M THB on
+  quotes landing high. At this page's 15 % that would be ~25M THB on
   Plan A and ~30M on Plan B at the midpoint.
 - The central hydraulic plant (not costed yet), the archive's mobile
   shelving (to quote), CD replication, financing costs, currency moves,
   and Thai duty and import VAT (the blocks assume BOI promotion).
 
 **What decides between them:** not demand, since both make the same
-records, but whether the investor funds ~39M THB more at launch for what
+records, but whether the investor funds ~35M THB more at launch for what
 Plan A leases or buys from revenue. On the modelled numbers Plan B's
 extra earns little: the same EBITDA in the revenue model (the calculator
-puts Plan B ~0.07M USD a year ahead, the PPA power bill its owned array
+puts Plan B ~0.06M USD a year ahead, the PPA power bill its owned array
 avoids), more depreciation and a longer payback;
 its case rests on that bill and on what the operating table leaves out:
 full stamper metrology for the traceability pitch from the first release,
@@ -209,7 +218,10 @@ installations (Announcement 3/2568, in force 1 July 2025; only the
 battery may still qualify, see [BOI](../boi.md)), so owning the array
 earns no tax benefit, only the bill. Most of Plan B's items can be added
 to Plan A later from revenue; the corridor is cheaper to have from the
-start. Both plans keep the second Duplex as a growth step, with its
+start. **Plan A over 180M:** the way back is a quote for a Chinese
+biomass boiler (ZOZEN, Sitong, Taiguo and Yongxing build them; none
+priced yet): ~2M or more below the Getabec-class package brings Plan A
+to 180M at the midpoint. Both plans keep the second Duplex as a growth step, with its
 floor, utility positions and ring-main tees reserved: ~15.4M THB at the
 midpoint for the system (~8.7M), a third chiller module CH-3 (~2.1M),
 their freight and installation (~1.2M) and the working capital for the

docs/finance/utilities-investment.csv

@@ -1,6 +1,7 @@
 category,item,spec_summary,candidate_thai_suppliers,cost_low_thb,cost_high_thb,cost_basis,notes
-steam,Electric/gas once-through boiler bank,"2 x 500 kg/h modules at 10.5 bar / 180 C, lead/lag, shared feed tank, feed pumps, economizer, installed","Miura Thailand (Chachoengsao); Bangkok Industrial Boilers; STE Thailand; Chinese route (October 2026): ZOZEN, Sitong, Fangkuai, Taiguo (ASME claimed, Thai references, no Thai service partner), see suppliers/china-utilities.md",4500000,7000000,engineering estimate,"Launch plant (October 2026): one Duplex system and one Classic, 450-540 kg/h at Newbilt's 150-180 kg/h per press, so B-1 and B-2 both at launch; the boiler hall is built for four modules (scale.md utility phasing); a third module for N+1 is an RFQ option; Miura-class modular once-through; service is Bangkok-centric, confirm northern dispatch SLA; Chinese route estimate 2.8M-5.5M THB installed (two ASME-stamped 1.25 MPa bodies USD 15k-35k each, inspection and certification, freight, Thai contractor balance of plant), about 1.6M THB less at the midpoint; imported boilers need DIW certification-body verification either way"
-steam,Biomass/wood-fired boiler package (option),"~1 t/h solid fuel (wood chips/pellets/rice husk) incl. fuel feed, grate, dust control, softener, installed",Getabec PCL (Thai fabrication and service),6000000,10000000,engineering estimate,"Sized for the five-press fleet (was ~0.5 t/h for one Duplex); sustainability path matching Deepgrooves NL precedent; higher capex, lower fuel opex in the North; NOT included in baseline total"
+steam,Electric/gas once-through boiler bank (alternative),"2 x 500 kg/h modules at 10.5 bar / 180 C, lead/lag, shared feed tank, feed pumps, economizer, installed","Miura Thailand (Chachoengsao); Bangkok Industrial Boilers; STE Thailand; Chinese route (October 2026): ZOZEN, Sitong, Fangkuai, Taiguo (ASME claimed, Thai references, no Thai service partner), see suppliers/china-utilities.md",4500000,7000000,engineering estimate,"NOT included in baseline total since 17 Oct 2026 (user: both plans run on biomass); kept as the alternative. Launch plant (October 2026): one Duplex system and one Classic, 450-540 kg/h at Newbilt's 150-180 kg/h per press, so B-1 and B-2 both at launch; the boiler hall is built for four modules (scale.md utility phasing); a third module for N+1 is an RFQ option; Miura-class modular once-through; service is Bangkok-centric, confirm northern dispatch SLA; Chinese route estimate 2.8M-5.5M THB installed (two ASME-stamped 1.25 MPa bodies USD 15k-35k each, inspection and certification, freight, Thai contractor balance of plant), about 1.6M THB less at the midpoint; imported boilers need DIW certification-body verification either way"
+steam,"Biomass/wood-fired boiler package, 2 x 500 kg/h or one ~1 t/h","~1 t/h solid fuel (wood chips/pellets/rice husk) incl. fuel feed, grate, dust control, softener, installed",Getabec PCL (Thai fabrication and service),6000000,10000000,engineering estimate,"Baseline since 17 Oct 2026 (user: ""option a and b should operate on biomass""); the launch plant draws 450-540 kg/h, so the two 500 kg/h modules of the boiler hall (B-1, B-2) or one ~1 t/h package; Chinese makers build biomass boilers too (ZOZEN DZL, Sitong DZL/SZL, Taiguo, Yongxing; china-utilities.md), not priced yet; fuel ~300 t air-dry wood or ~460 t fresh chips a year at ~850k records, ~0.67M THB at 0.7 THB/kWh of heat (biomass.md); sustainability path matching Deepgrooves NL precedent"
+steam,Biomass fuel store and handling,"Covered fuel store (42 m2 in the site model, ~6-7 weeks of fresh chips; ~80 m2 for a 3-month monsoon stock), chip bay, ash bins, compact loader",Local steel-shed contractors; loader dealers (used compact loaders),1000000,2000000,engineering estimate,"biomass.md: fuel handling and storage come on top of the boiler package; shed at roughly half the main building's 12,000-20,000 THB/m2 plus a used loader (estimate)"
 steam,Steam balance of plant,"Traps, accumulator, condensate return",Forbes Marshall Thailand,0,0,included,Largely included in boiler package rows; line kept for RFQ completeness
 compressed_air,Screw compressor skid (oil-injected),"~7.5 kW VSD screw + refrigerated dryer (3 C PDP) + coalescing filters + ~500 L receiver, installed","Atlas Copco Thailand; Kaeser Thailand (SM-T/Aircenter); Ingersoll Rand Thailand; Chinese brands with Thai offices (October 2026): Kaishan Compressor (Thailand), Denair Thailand, see suppliers/china-utilities.md",350000,600000,engineering estimate,"14-30 m3/h demand is small (5-10 hp class); oil-injected + filter train meets 5 micron / 3 C spec; Chinese route estimate 0.15M-0.3M THB installed (PM VSD 11 kW class USD 2k-5k, dryer, receiver, filters, installation)"
 compressed_air,True oil-free class-0 (option),Same duty in oil-free class-0,Atlas Copco (ZR/ZT); Kaeser,1200000,1800000,engineering estimate,Only if air contacts product stream; NOT included in baseline total
@@ -13,6 +14,6 @@ water,Galvanics ZLD evaporator,"Small MVR or low-temp vacuum evaporator for plat
 storage,Pallet racking and shelving,"100-200 pallet positions selective/heavy-duty (beams sized 1000-1500 kg/pallet, records are dense) + archive and finished-goods shelving, installed","Jenbunjerd; LPI Rack Range (Thailand), Bangkok/Samut Prakan, racking and office mobile shelving; local fabricators (Sahawatthanakit, UPR, SD Shelf); SSI Schaefer (premium)",800000,1500000,published list prices + engineering estimate,SSI Schaefer premium tier ~1.5-3M for same scope; ~1000-2000 THB per pallet position at local tier
 hvac,Whole-factory HVAC,"~1500 m2 at 20-26 C, 35-60% RH, ePM1/F7-F9 filtration sized for burning-season PM2.5, ducting and controls","Daikin Thailand; Trane; Mitsubishi Electric; Carrier; filtration: Camfil Thailand, AAF",7500000,15000000,engineering estimate at 5000-10000 THB/m2,"RH low end of 35% is aggressive for tropics and drives desiccant cost; if 45-60% RH acceptable, cost drops materially"
 hvac,Clean-room-grade zone adder,"Cutting room + galvanics clean room, ~2 x 60 m2, ISO 7/8 with HEPA terminals, positive pressure, airlocks",Same HVAC vendors + clean-room contractors; Camfil HEPA,1200000,3400000,engineering estimate at 10000-28000 THB/m2 adder,Applied only to the two tight zones
-solar,"PV EPC, every roof and canopy covered (~640 kWp on the Payap scenario plot)","Turnkey C&I EPC on the factory roof (~523 kWp), the office roof (~65 kWp) and the car and scooter canopies (~54 kWp), incl. inverters (Deye hybrids where the battery connects), at 20000-26000 THB/kWp",Solar Nicolo (Deye tier-1 distributor); Banpu NEXT; SCG Cleanergy; Sermsang; CapSolar; local Chiang Mai installers,12800000,16640000,"market rate per kWp (October 2026 check): DEDE Thailand PV Status (Mahidol survey) 22-25 THB/W for 10 kW-1 MW C&I systems in 2023; CapSolar 2026 20-25 THB/W under 1 MWp (20-23 at 500 kWp); Saimai Solar 2026 list 5.4M THB for 300 kW (18 THB/W); top of range covers Deye SUN-50K-SG01HP3 hybrid inverters (160,500 THB each at Supsaringkan, about ten 50 kW units for ~500 kVA); size: the roofs full, user decision 17 Oct 2026 (was an illustrative 300 kWp)","Size follows the site: on the Mueang Chi hall the roof and canopies take ~300 kWp (scale.md), the rest would be ground mount; canopy steel is in the construction RFQ site works; ~85% of the yield used on site under PEA zero export (hourly sketch, estimate); self-consumed PV worth ~3.7 THB/kWh, ~4.2-5.9 yr payback (sustainability.md, grid tariff)"
+solar,"PV EPC, factory roof (~520 kWp on the Payap scenario plot)","Turnkey C&I EPC on the factory roof (~523 kWp in the parts model), incl. inverters (Deye hybrids where the battery connects), at 20000-26000 THB/kWp; office roof (~65 kWp) and car and scooter canopies (~54 kWp) PV-ready, panels later",Solar Nicolo (Deye tier-1 distributor); Banpu NEXT; SCG Cleanergy; Sermsang; CapSolar; local Chiang Mai installers,10400000,13520000,"market rate per kWp (October 2026 check): DEDE Thailand PV Status (Mahidol survey) 22-25 THB/W for 10 kW-1 MW C&I systems in 2023; CapSolar 2026 20-25 THB/W under 1 MWp (20-23 at 500 kWp); Saimai Solar 2026 list 5.4M THB for 300 kW (18 THB/W); top of range covers Deye SUN-50K-SG01HP3 hybrid inverters (160,500 THB each at Supsaringkan, about nine 50 kW units for ~430 kVA); size: the factory roof, user decision 17 Oct 2026 (was every roof and canopy, ~640 kWp, and before that an illustrative 300 kWp)","Size: with biomass steam the best array is ~500-550 kWp (hourly sketch, sustainability.md), so the factory roof's ~520 kWp; on the Mueang Chi hall the factory roof takes ~247 kWp (scale.md); PV-ready means structure for the panels, conduit and a spare way at the main board (in the building and site works); ~87% of the yield used on site under PEA zero export (estimate); self-consumed PV worth ~3.7 THB/kWh, ~4.1-5.8 yr payback (sustainability.md, grid tariff)"
 solar,Battery stack 271 kWh (Gobel) installed,"GP-SRA-HV314 HV LiFePO4 rack, 15 x 18 kWh packs, direct from Shenzhen, 50-60 day lead; plus enclosure, fire detection and suppression, controls and installation",Gobel Power (no Thai distributor; integration by solar EPC),2000000,3500000,"battery: vendor listed price USD 39900-58000 at ~35 THB/USD = 1.40-2.03M THB, in line with DEDE's 5000-7000 THB/kWh for LiFePO4 (Mahidol survey); installed: estimate below CapSolar's 12000-15000 THB/kWh for a fully installed factory BESS (2026), because the Deye hybrid inverters in the PV row do the power conversion",Confirm Deye BMS protocol compatibility and that the EPC warrants a mixed-vendor DC bus; certs (UN38.3/IEC 62619/CE) to be requested
-total,BASELINE TOTAL,Electric steam bank (2 modules) + oil-injected air + chiller bank (2 modules) + softener + loop treatment + local racking + HVAC + clean zones + ~640 kWp solar + 271 kWh BESS,,34370000,56340000,sum of baseline rows,"Launch plant, one Duplex system and one Classic (October 2026; solar and battery re-priced from Thai market data and the array sized to every roof and canopy 17 Oct 2026, was 27.57M-47.50M at 300 kWp and 28.47M-48.73M before the re-price; was 30.07M-51.33M THB for five presses, 23.98M-41.63M for one Duplex); ~750k-1280k EUR at 38 THB/EUR; excludes options rows and the galvanics water rows (ZLD, DI), which total-investment.md carries with galvanics; all figures budgetary +/- 30%, get RFQs before BOI"
+total,BASELINE TOTAL,Biomass boiler package (2 modules) + fuel store + oil-injected air + chiller bank (2 modules) + softener + loop treatment + local racking + HVAC + clean zones + ~520 kWp factory-roof solar + 271 kWh BESS,,34470000,58220000,sum of baseline rows,"Launch plant, one Duplex system and one Classic (October 2026; biomass steam and PV on the factory roof only 17 Oct 2026, was 34.37M-56.34M with electric steam and ~640 kWp; solar and battery re-priced from Thai market data and the array sized to every roof and canopy 17 Oct 2026, was 27.57M-47.50M at 300 kWp and 28.47M-48.73M before the re-price; was 30.07M-51.33M THB for five presses, 23.98M-41.63M for one Duplex); ~750k-1280k EUR at 38 THB/EUR; excludes options rows and the galvanics water rows (ZLD, DI), which total-investment.md carries with galvanics; all figures budgetary +/- 30%, get RFQs before BOI"

docs/fleet-calculator.html

@@ -931,8 +931,8 @@ html[data-theme=light] .iso-svg .iso-glint { display: inline; }
   var VERSION = "1.1";
   var DEF = {
     duplex: 1, classic: 1, galvanics: true, cutting: true, metrology: "full",
-    cassette: true, cdr: true, solar: "buy", pvKwp: 640, batteryKwh: 271,
-    fuel: "electric", boilerModules: 2, chillerModules: 2, crane: "buy",
+    cassette: true, cdr: true, solar: "buy", pvKwp: 520, batteryKwh: 271,
+    fuel: "biomass", boilerModules: 2, chillerModules: 2, crane: "buy",
     corridor: true, phase2: false, running: true, labels: true
   };
   var OFFW = { off: 1, out: 1, bought: 1, no: 1, none: 1, later: 1, "false": 1, "0": 1, "": 1 };
@@ -1314,16 +1314,17 @@ html[data-theme=light] .iso-svg .iso-glint { display: inline; }
 
   // ------------------------------------------------------------ PV placement
   var PV_ROWS = [1, 3, 5, 7, 10, 12, 14, 16, 19, 21];
-  // kWp per drawn module place (~2 m2): every place on the factory roof, the office roof and the two canopies
-  // together (1,467) is the ~640 kWp design (site-candidates.md parts model plus the office roof)
-  var PV_MOD = 0.4363;
+  // kWp per drawn module place (~2 m2): the 1,220 places on the factory roof are the ~520 kWp array of the
+  // plans (decided October 2026: PV on the factory only; the office roof and the canopies are PV-ready and
+  // take panels only above that size)
+  var PV_MOD = 0.4262;
   function pvFields(cfg, al) {
     var f = [];
-    // the parking canopies carry PV first (construction RFQ: canopy PV), the factory roof takes the rest
-    f.push({ key: "cars", x0: 18.35, cols: 27, y0: 6, rows: [0.15, 2.45, 4.75], z: function (y) { return 2.9 + (y - 6) / 7 * 1.2 + 0.08; } });
-    f.push({ key: "scoot", x0: 20.35, cols: 13, y0: 26, rows: [0.4, 2.85], z: function (y) { return 2.45 + (y - 26) / 5.5 * 1.05 + 0.08; } });
+    // the factory roof fills first; the PV-ready office roof and parking canopies take any kWp above it
     f.push({ key: "roofW", x0: X(1), cols: 103, y0: FY, rows: PV_ROWS, z: function (y) { return roofZ(y - FY) + 0.12; } });
     f.push({ key: "roofE", x0: X(107.25), cols: 19, y0: FY, rows: PV_ROWS, z: function (y) { return roofZ(y - FY) + 0.12; } });
+    f.push({ key: "cars", x0: 18.35, cols: 27, y0: 6, rows: [0.15, 2.45, 4.75], z: function (y) { return 2.9 + (y - 6) / 7 * 1.2 + 0.08; } });
+    f.push({ key: "scoot", x0: 20.35, cols: 13, y0: 26, rows: [0.4, 2.85], z: function (y) { return 2.45 + (y - 26) / 5.5 * 1.05 + 0.08; } });
     // office roof: flat, the three AC units in the middle keep a clear strip around them
     var oz = function () { return OFC.z1 + 0.14; };
     f.push({ key: "offW", x0: OFC.x0 + 1, cols: 18, y0: OFC.y0, rows: [0.8, 3.1, 5.4, 7.7, 10.0, 12.3], z: oz });
@@ -1543,8 +1544,8 @@ html[data-theme=light] .iso-svg .iso-glint { display: inline; }
     sp.prism(rect(20, 26, 33.7, 31.5), [2.3, 2.3, 3.35, 3.35], [2.45, 2.45, 3.5, 3.5], "iso-canopy");
     pvDraw(sp, pv.by.scoot.F, pv.by.scoot.panels);
     var nc = pv.by.cars.panels.length, ns = pv.by.scoot.panels.length;
-    sc.inf("canopy-cars", "Car canopy, 10 bays", "27.7 x 7.0 m at 4.1 m (construction RFQ)" + (nc ? "; " + nc + " PV modules (~" + fmt(nc * PV_MOD) + " kWp)" : ""));
-    sc.inf("canopy-scooters", "Scooter canopy, ~30 spaces", "13.7 x 5.5 m at 3.5 m (construction RFQ)" + (ns ? "; " + ns + " PV modules (~" + fmt(ns * PV_MOD) + " kWp)" : ""));
+    sc.inf("canopy-cars", "Car canopy, 10 bays", "27.7 x 7.0 m at 4.1 m (construction RFQ)" + (nc ? "; " + nc + " PV modules (~" + fmt(nc * PV_MOD) + " kWp)" : "; PV-ready: steel sized for ~42 kWp of panels, conduit to the main board; panels later"));
+    sc.inf("canopy-scooters", "Scooter canopy, ~30 spaces", "13.7 x 5.5 m at 3.5 m (construction RFQ)" + (ns ? "; " + ns + " PV modules (~" + fmt(ns * PV_MOD) + " kWp)" : "; PV-ready: steel sized for ~13 kWp of panels, conduit to the main board; panels later"));
   }
 
   // ------------------------------------------------------------ factory
@@ -2224,7 +2225,7 @@ html[data-theme=light] .iso-svg .iso-glint { display: inline; }
   var OFC_UP = 4.0; // storey height: first floor at z0 + 4.0 (8 m to the roof for two storeys)
   function officeInfo(sc, cfg) {
     sc.inf("office", "Office building, 32 x 15 m",
-      "Two storeys (~960 m2) with a stair and a lift. Ground floor: reception and lobby, canteen, changing rooms, toilets, mastering and cutting, listening room, archive. " +
+      "PV-ready flat roof (structure for ~65 kWp of panels, conduit to the main board; panels later). Two storeys (~960 m2) with a stair and a lift. Ground floor: reception and lobby, canteen, changing rooms, toilets, mastering and cutting, listening room, archive. " +
       "First floor: offices, meeting and training, a meeting room, IT and server room, toilets, pantry, a flexible room. Isolated from the factory floor, joined by a covered link (site-candidates.md).");
     sc.inf("cutting", cfg.cutting ? "Mastering and cutting room" : "Cutting room: cut abroad",
       cfg.cutting ? "Sillitoe SDMS lathe (USD 125k list) on the ground slab, away from press vibration and outside the crane zone; inner acoustic lining" :
@@ -2514,7 +2515,7 @@ html[data-theme=light] .iso-svg .iso-glint { display: inline; }
       if (onP2) parts.push(onP2 + " on the phase 2 roof");
       sc.inf("pv", "PV " + fmt(kwp) + " kWp, " + fmt(cfg.batteryKwh) + " kWh battery" + (ppa ? " (PPA)" : ""),
         fmt(pv.want) + " modules of ~" + PV_MOD.toFixed(2) + " kWp (~2 m2 each): " + parts.join(", ") + (pv.left ? "; " + fmt(pv.left) + " do not fit the roofs (ground mount)" : "") +
-        ". About " + fmt(kwp * 1.4) + " to " + fmt(kwp * 1.5) + " MWh a year at 1,400 to 1,500 kWh/kWp (scale.md), ~85 % of it used on site (zero export)" + (ppa ? ". PPA: the EPC owns the panels, the plant buys the power." : "."));
+        ". About " + fmt(kwp * 1.4) + " to " + fmt(kwp * 1.5) + " MWh a year at 1,400 to 1,500 kWh/kWp (scale.md), ~87 % of it used on site (zero export)" + (ppa ? ". PPA: the EPC owns the panels, the plant buys the power." : "."));
       if (!inside && onRoof) {
         sc.tag(X(52), Y(10), roofZ(10) + 1.5, "PV " + fmt(kwp) + " kWp", 10, "pv");
         if (ppa) sc.tag(X(80), Y(6), roofZ(6) + 1.0, "PPA panels", 100, "pv", "iso-signtag");
@@ -2856,7 +2857,7 @@ const S0 = {
   priceStd: 3.8, premSpec: 1.15, titleFee: 1155, cur: "USD", boi: "on", exportShare: 70, capexEnd: "mid",
   // plant configuration (defaults = the launch plant, total-investment.md October 2026)
   galv: "in", galvPrice: "pheenix", cut: "in", metro: "full", cass: "on", cdr: "on", countCD: "off",
-  solar: "buy", steamFuel: "electric", sourcing: "thai", crane: "buy", corridor: "now", reserve: "in", cont: "in", stSupply: 0,
+  solar: "buy", steamFuel: "biomass", sourcing: "thai", crane: "buy", corridor: "now", reserve: "in", cont: "in", stSupply: 0,
 };
 // allowed values of every switch, default first where it matters for readHash
 const ENUM = {
@@ -2966,9 +2967,9 @@ grp("Energy", [
   ["kwhPrice", "Electricity, blended", 3.81, "THB/kWh", "doc", "scale.md: PEA TOU 3.2.2 at two shifts, before the demand charge (Ft September to December 2026)"],
   ["demandPrice", "Demand charge", 132.93, "THB/kW a month", "doc", "PEA 3.2.2 (scale.md)"],
   ["restKW", "Rest of the plant while running", 120, "kW", "est", "Estimate: HVAC, lighting, galvanics, finishing, offices; puts the start fleet in scale.md's 4.5 to 6.8M THB a year before PV"],
-  ["pvKWp", "PV array: factory roof, office roof and parking canopies, all full", 640, "kWp", "est", "Payap scenario: factory roof ~523 kWp and canopies ~54 kWp (site-candidates.md parts model, 580 W placeholder module) plus the office roof ~65 kWp (estimate from this drawing); on the Mueang Chi hall the roof and canopies take ~300 kWp (scale.md)"],
+  ["pvKWp", "PV array on the factory roof", 520, "kWp", "est", "Decided October 2026: PV on the factory only, the office roof (~65 kWp) and the parking canopies (~54 kWp) PV-ready for later. Payap scenario factory roof ~523 kWp (site-candidates.md parts model, 580 W placeholder module), near the biomass-case optimum of ~500 kWp (sustainability.md); the Mueang Chi roof takes ~247 kWp (scale.md)"],
   ["pvYield", "PV yield", 1400, "kWh/kWp", "doc", "scale.md: 1,400 to 1,500 kWh/kWp a year in northern Thailand"],
-  ["pvSelf", "Share of the PV yield used on site", 85, "%", "est", "Hourly sketch (October 2026): two shifts on 300 days, ~60 kW off-shift base load, the 271 kWh battery; the rest is curtailed, because a factory on PEA's grid runs zero export (sustainability.md)"],
+  ["pvSelf", "Share of the PV yield used on site", 87, "%", "est", "Hourly sketch (October 2026), biomass steam: ~230 kW running load on two shifts and 300 days, ~60 kW off-shift base load, the 271 kWh battery; the rest is curtailed, because a factory on PEA's grid runs zero export (sustainability.md)"],
   ["heatPrice", "Steam heat from biomass", 0.7, "THB/kWh", "doc", "biomass.md: 0.5 to 0.9 at 1.35 to 2 THB/kg delivered"],
   ["steamKWh", "Heat per kg of steam", 0.68, "kWh/kg", "est", "Estimate: 10 bar saturated steam from ~80 °C feed water"],
   ["eBoilEff", "Electric boiler efficiency", 98, "%", "est", "Estimate for an electric steam boiler (~98 %)"],
@@ -3034,14 +3035,15 @@ rng("Investment blocks (USD unless THB)", [
   ["pvcL", "PVC lab, day-one tier", 55000, 150000, "USD", "est", "quality-automation.md"],
   ["bTh", "Electric boiler module, 500 kg/h, Thai supplier, installed", 2250000, 3500000, "THB", "est", "Utilities CSV: bank of two 4.5 to 7.0M THB, engineering estimate"],
   ["bCn", "Electric boiler module, 500 kg/h, Chinese route, installed", 1400000, 2750000, "THB", "est", "china-utilities.md: two ASME-stamped modules 2.8 to 5.5M THB installed"],
-  ["bBio", "Biomass boiler module, 500 kg/h, installed", 3000000, 5000000, "THB", "est", "Utilities CSV: biomass package 6 to 10M THB for ~1 t/h (Getabec class), estimate"],
+  ["bBio", "Biomass boiler module, 500 kg/h, installed", 3000000, 5000000, "THB", "est", "Utilities CSV: biomass package 6 to 10M THB for ~1 t/h incl. fuel feed, grate and dust control (Getabec class), estimate"],
+  ["bFuel", "Biomass fuel store and handling", 1000000, 2000000, "THB", "est", "Utilities CSV: covered fuel store (42 m2 drawn, ~6 to 7 weeks of fresh chips; ~80 m2 for a 3-month monsoon stock), chip bay, ash bins, a compact loader; estimate (biomass.md: fuel handling and storage come on top of the boiler package)"],
   ["cBk", "Cooling backbone: plate HX, tanks, pumps, mains for four modules", 1700000, 2700000, "THB", "est", "Utilities CSV: chiller bank of two 4.9 to 7.9M THB less two modules"],
   ["chM", "Chiller module, 250 kW air-cooled, installed", 1600000, 2600000, "THB", "est", "Utilities CSV: one module ~1.6 to 2.6M THB, estimate"],
   ["airT", "Compressed air, Thai supplier", 350000, 600000, "THB", "est", "Utilities CSV: screw compressor skid, dryer, receiver"],
   ["airC", "Compressed air, Chinese brand through its Thai office", 150000, 300000, "THB", "est", "china-utilities.md: PM VSD screw set 0.15 to 0.3M THB installed"],
   ["clR", "Clean-room adder (galvanics and cutting room)", 1200000, 3400000, "THB", "est", "Utilities CSV, ~2 × 60 m² ISO 7/8; half with only one of the two rooms (estimate)"],
-  ["uRest", "Rest of the utilities baseline: softener, loop treatment, racking, whole-factory HVAC", 8620000, 17300000, "THB", "est", "Utilities CSV baseline 34.37 to 56.34M THB less boilers, chillers, air, clean room, PV and battery"],
-  ["pv", "PV EPC per kWp, roofs and canopies", 20000, 26000, "THB", "est", "Utilities CSV: 20 to 26 THB/W installed (DEDE Thailand PV status: factories 10 kW to 1 MW 22 to 25 THB/W, 2023; installers 18 to 25 in 2026) incl. the inverters; times the array size above; canopy steel is in the building and site works (construction RFQ)"],
+  ["uRest", "Rest of the utilities baseline: softener, loop treatment, racking, whole-factory HVAC", 8620000, 17300000, "THB", "est", "Utilities CSV baseline 34.47 to 58.22M THB less boilers, fuel store, chillers, air, clean room, PV and battery"],
+  ["pv", "PV EPC per kWp, factory roof", 20000, 26000, "THB", "est", "Utilities CSV: 20 to 26 THB/W installed (DEDE Thailand PV status: factories 10 kW to 1 MW 22 to 25 THB/W, 2023; installers 18 to 25 in 2026) incl. the inverters; times the array size above; canopy steel is in the building and site works (construction RFQ)"],
   ["bat", "Battery 271 kWh (Gobel), installed", 2000000, 3500000, "THB", "est", "Utilities CSV: Gobel list price USD 39,900 to 58,000 (battery only, matches DEDE's 5,000 to 7,000 THB/kWh for LiFePO4) plus enclosure, fire protection, controls and installation, below the 12,000 to 15,000 THB/kWh of a fully installed factory BESS because the hybrid inverters do the power conversion (estimate)"],
   ["bld", "Building ~1,500 m² plus civil and site works", 650000, 1100000, "USD", "est", "total-investment.md: 12,000 to 20,000 THB/m² plus ~20 % site works; soil is the main variable"],
   ["ph2", "Phase 2 building, when the press floor outgrows the press hall", 750000, 1250000, "USD", "est", "Business plan draft 0.1: ~750k to 1,250k on 1,710 m², estimate"],
@@ -3242,6 +3244,7 @@ function capexOf(r, c = S, boiOn = c.boi !== "off") {
   else blk("Quality", "metF", "Metrology, full stack: XRF, laser confocal, wide-area profiler, inline vision, audio station", 1, false, { imp: 1 });
   blk("Quality", "pvcL", "PVC lab, day-one tier");
   const bio = c.steamFuel === "biomass", cn = c.sourcing === "china";
+  if (r.nb > 0 && bio) blk("Utilities", "bFuel", "Biomass fuel store, chip bay, ash bins and a compact loader", 1, true);
   if (r.nb > 0) blk("Utilities", bio ? "bBio" : cn ? "bCn" : "bTh",
     `Steam: ${pl(r.nb, `${f0(A.boilerMod)} kg/h ${bio ? "biomass" : "electric"} boiler module`)}${bio ? "" : cn ? ", Chinese route" : ", Thai supplier"}`, r.nb, true);
   blk("Utilities", "cBk", "Cooling backbone: plate HX, tanks, pumps and mains for four modules", 1, true);
@@ -3251,7 +3254,7 @@ function capexOf(r, c = S, boiOn = c.boi !== "off") {
   if (cr > 0) blk("Utilities", "clR", cr === 1 ? "Clean-room adder: galvanics and cutting room" : `Clean-room adder, half: ${galvIn ? "galvanics" : "cutting room"} only`, cr, true);
   blk("Utilities", "uRest", "Rest of the utilities baseline: softener, loop treatment, racking, whole-factory HVAC", 1, true);
   if (c.solar === "buy") {
-    blk("Utilities", "pv", `PV on the roofs and canopies, ${f0(A.pvKWp)} kWp, EPC`, A.pvKWp, true);
+    blk("Utilities", "pv", `PV on the factory roof, ${f0(A.pvKWp)} kWp, EPC (office roof and canopies PV-ready)`, A.pvKWp, true);
     blk("Utilities", "bat", "Battery 271 kWh (Gobel)", 1, true);
   }
   blk("Building and site", "bld", "Building ~1,500 m² plus civil and site works");
@@ -3646,7 +3649,7 @@ const CFG = [
     h: { off: "Illustrative volumes and prices with no market data; left out of the money.",
       on: "Counted at the illustrative volumes and prices, with no running costs on file: it flatters the result." },
     dis: () => S.cass === "off" && S.cdr === "off" ? "Not applicable: neither line is in the plant." : "" },
-  { k: "solar", t: "Solar PV and 271 kWh battery", sub: "every roof and canopy covered (~640 kWp) plus the Gobel battery",
+  { k: "solar", t: "Solar PV and 271 kWh battery", sub: "the factory roof (~520 kWp; office and canopies PV-ready) plus the Gobel battery",
     o: [["buy", "Buy"], ["ppa", "Solar PPA"], ["none", "None"]],
     h: { buy: () => `${nf(1).format(A.pvLo * A.pvKWp / 1e6)}M to ${nf(1).format(A.pvHi * A.pvKWp / 1e6)}M THB for ${f0(A.pvKWp)} kWp plus ${mT("bat")} battery; the yield offsets the bill.`,
       ppa: "No capex: the EPC owns the array, the plant pays the PPA price on the yield.",
@@ -3655,8 +3658,8 @@ const CFG = [
   { k: "steamFuel", t: "Steam fuel", sub: "the boiler modules follow the fleet's peak steam",
     o: [["electric", "Electric"], ["biomass", "Biomass"]],
     h: { electric: "Electric modules on PEA power: energy charge plus demand charge per installed module.",
-      biomass: "Biomass modules (utilities CSV package); heat at the biomass price." } },
-  { k: "sourcing", t: "Utilities sourcing", sub: "electric boiler modules and the compressor",
+      biomass: "Biomass modules (utilities CSV package) plus the fuel store; heat at the biomass price. Both plans run on biomass (October 2026)." } },
+  { k: "sourcing", t: "Utilities sourcing", sub: "the compressor, and the boiler modules when steam is electric",
     o: [["thai", "Thai suppliers"], ["china", "Chinese route"]],
     h: { thai: "Thai suppliers, installed (utilities CSV).",
       china: "ASME-stamped bodies installed by a Thai contractor, compressor through a Chinese brand's Thai office (china-utilities.md)." } },
@@ -3722,7 +3725,7 @@ function renderInvest(e, r) {
   H.push(`<tr class="grp"><td colspan="5">Totals</td></tr>`);
   TR("Subtotal", cx.sub, "", true);
   TR(cx.ctgIn ? `Contingency ${f1(A.contPct)} %` : `Contingency ${f1(A.contPct)} % (not in the total)`, cx.ctg, cx.ctgIn ? "total-investment.md" : "shown separately, as in Plan A and Plan B");
-  TR("Total investment", cx.tot, "for reference, total-investment.md: the launch plant ~168M to 294M THB with contingency (midpoint ~231M); Plan A ~162M and Plan B ~201M at the midpoint without it, plus the ramp-up reserve", true);
+  TR("Total investment", cx.tot, "for reference, total-investment.md: the launch plant ~168M to 296M THB with contingency (midpoint ~232M); Plan A ~167M and Plan B ~202M at the midpoint without it, plus the ramp-up reserve", true);
   if (!cx.boiOn) {
     TR(`Import duty without BOI, ${f1(A.dutyMach)} %`, cx.duty, `on ${money(cx.imp.lo)} to ${money(cx.imp.hi)} of imported machinery; import VAT ${money(cx.vat.mid)} at the midpoint, reclaimable`);
     TR("Total with import duty", cx.all, "", true);

docs/roadmap.md

@@ -173,7 +173,7 @@ Nothing in Phases 2 to 5 starts before its gate clears: no machinery order
 before the BOI certificate, no big-block spending before the market
 validates the price, no coppice fuel planning before the land title check.
 Since October 2026 the plant launches with everything in one capital
-round (~168M to 294M THB with contingency; for the investor Plan A at
+round (~168M to 296M THB with contingency; for the investor Plan A at
 ~180M and Plan B at ~215M THB without it, in
 [total investment](finance/total-investment.md#two-plans-a-at-180m-thb-and-b-at-215m-thb-october-2026));
 the gates still come before the round is spent, and the growth options

docs/scale.md

@@ -298,19 +298,20 @@ small against the connection, but its own feeder and meter.
   roof plane, per the [construction RFQ](finance/phase1-construction-rfq.md)).
   This supersedes the older rule of thumb of 150 to 200 kWp on a
   ~1,500 m² building, which the massing model has overtaken
-- **Decided 17 October 2026: every roof and canopy carries PV.** On this
-  hall that is the 247 kWp roof plus the canopies' ~40 to 54 kWp, ~300
-  kWp; on the Payap scenario plot ~640 kWp, the size the investment and
-  the business plan carry
+- **Decided 17 October 2026: PV on the factory roof only, the other
+  buildings PV-ready, biomass steam.** On this hall that is the 247 kWp
+  roof (canopies PV-ready); on the Payap scenario plot ~520 kWp, the size
+  the investment and the business plan carry, about the ~500 to 550 kWp
+  optimum for a biomass-steam load
   ([sustainability](sustainability.md#roof-design-for-pv-candidate-mueang-chi-site))
 - Northern Thailand yield ~1,400 to 1,500 kWh/kWp/yr, so 300 kWp produces
-  roughly **420 to 450 MWh/yr** and ~640 kWp ~900 to 960 MWh/yr
+  roughly **420 to 450 MWh/yr** and ~520 kWp ~730 to 780 MWh/yr
 - Plant consumption at mature two-shift operation: roughly **1,000 to
   1,500 MWh/yr** without electric steam, up to **~2,500 MWh/yr** with it
   (estimate), so 300 kWp covers roughly **28 to 45%** of consumption
-  without electric steam, falling to **~17%** with it; ~640 kWp, at
-  ~85 % used on site under zero export, covers ~38 % of the launch
-  plant's ~2,000 MWh with electric steam (calculator, estimate)
+  without electric steam, falling to **~17%** with it; ~520 kWp, at
+  ~87 % used on site under zero export, covers ~61 % of the launch
+  plant's ~1,036 MWh with biomass steam (calculator, estimate)
 - Battery: **271 kWh** Gobel stack (ride-through, roughly
   an hour of the chiller bank's peak electrical draw; peak shaving earns
   little under PEA's time-of-use tariff, see

docs/site-candidates.md

@@ -352,13 +352,14 @@ parameter does.
   - the BOI no longer promotes solar installations (since 1 July 2025;
     only the battery may qualify, [BOI](boi.md)).
 
-  Decided 17 October 2026: every roof and canopy carries PV. With the
+  Decided 17 October 2026: PV on the factory roof only (~520 kWp), the
   flat office roof (~65 kWp around its AC units, estimate from the
-  [calculator](fleet-calculator.html) drawing) that is **~640 kWp**, the
-  size in the investment and the business plan. PEA's zero-export rule
-  answers the first point (surplus curtailed, ~85 % used on site in an
-  hourly sketch); the permits and the BOI position are in
-  [sustainability](sustainability.md#roof-design-for-pv-candidate-mueang-chi-site).
+  [calculator](fleet-calculator.html) drawing) and the canopies (~54 kWp)
+  built PV-ready for later; steam is biomass, and with that load the best
+  array is ~500 to 550 kWp. PEA's zero-export rule answers the first point
+  (surplus curtailed, ~87 % used on site in an hourly sketch); the
+  permits, the BOI position and the sizing are in
+  [sustainability](sustainability.md#pv-size-with-biomass-steam).
 
 FreeCAD 26.3.0 RC1 does not pass a cell edit on to the parts that read
 the cell (a normal recompute updates only the sheet). After editing

docs/steam-cooling.html

@@ -179,7 +179,7 @@ td.low{color:var(--warn);font-weight:600}
     <h3>Boilers (Miura, Bangkok Industrial Boilers, STE)</h3>
     <ul>
       <li>2 × 500 kg/h against 3 × 500 kg/h and 1 × 1 t/h: price, footprint, lead/lag control, service from Chiang Mai.</li>
-      <li>Fuel: electric, biomass or LPG (sustainability.md, biomass.md); an electric bank draws ~312 to 375 kW for the launch plant, ~520 to 625 kW with five presses.</li>
+      <li>Fuel: biomass for B-1 and B-2 in both business plan versions (decided October 2026, biomass.md); an electric bank, the alternative, would draw ~312 to 375 kW for the launch plant, ~520 to 625 kW with five presses.</li>
       <li>Economizer on a fired bank: outlet feed and stack temperature, corrosion limit, pressure drop; rice husk ash is high in silica and abrasive, so fouling, cleaning, wear protection and a bypass.</li>
       <li>Blowdown cooling to the effluent limit; boiler registration and licensed operator (facility-security.md).</li>
       <li>Footprint per module with fuel feed, dust collector and fan, against the ~18 × 9 m hall laid out for four modules.</li>

docs/sustainability.md

@@ -34,23 +34,25 @@ process cooling (up to ~650 kW), drawn in [steam and cooling](steam-cooling.html
   PEA's time-of-use tariff it earns little from peak shaving
   ([grid tariff](#grid-tariff-pea-and-what-it-decides)).
 - The machine load and cooling system are straightforward PV targets.
-- Steam is the open engineering question. Options under evaluation are an
-  electric boiler (maximizes the solar share) and a biomass boiler (locally
-  abundant fuel); solar-thermal pre-heating of boiler feedwater was
-  considered and is not recommended. No technology choice has been made
-  yet; it will be driven by honest numbers on load profiles, storage, and
-  grid backup, not by what sounds greenest. At PEA's tariff and current
-  northern fuel prices, biomass heat costs a quarter to a tenth of electric
-  steam
-  ([grid tariff](#grid-tariff-pea-and-what-it-decides)).
+- **Steam: biomass, decided 17 October 2026 for both business plan
+  versions** (user: "option a and b should operate on biomass"). At PEA's
+  tariff and current northern fuel prices biomass heat costs a quarter to
+  a tenth of electric steam
+  ([grid tariff](#grid-tariff-pea-and-what-it-decides)): for the launch
+  plant ~0.67M THB of fuel a year against ~4.9M THB for electric steam with
+  its demand charge (calculator, estimates). The electric bank stays the
+  alternative ([biomass](biomass.md)); solar-thermal pre-heating of boiler
+  feedwater was considered and is not recommended.
 - Whole-factory HVAC (continuous temperature, humidity, and PM control, see
   [facility systems](facility-security.md)) adds a major tropical-climate
   load on top of process cooling and must be part of the PV and battery
   sizing.
-- **Array size, decided 17 October 2026: every roof and canopy carries PV**
-  ("use as much roof space as possible"), so the kWp follows the site:
-  ~640 kWp on the Payap scenario plot, ~300 kWp on the Mueang Chi hall
-  (below). Storage beyond the 271 kWh ride-through battery stays open.
+- **Array size, decided 17 October 2026: PV on the factory roof only, the
+  other buildings PV-ready** ("only put solar on the factory, prepare the
+  other buildings for solar"): ~520 kWp on the Payap scenario plot,
+  ~247 kWp on the Mueang Chi hall; why that size is in
+  [PV size with biomass steam](#pv-size-with-biomass-steam). Storage beyond
+  the 271 kWh ride-through battery stays open.
 
 ### Roof design for PV (candidate Mueang Chi site)
 
@@ -111,28 +113,58 @@ the electric-boiler route is chosen.
 On the Payap scenario plot the 128 m factory roof takes ~901 modules
 (~523 kWp) and the car and scooter canopies another ~54 kWp, ~577 kWp in
 all ([site candidates](site-candidates.md#roof-pv-and-parking-canopies-part-and-draft-model-october-2026)).
-The flat office roof adds ~65 kWp around its three AC units (estimate
-from the [calculator](fleet-calculator.html) drawing), so covering every
-roof and canopy gives **~640 kWp**, the size the investment and both
-business plan versions carry since 17 October 2026. On the Mueang Chi
-hall the same rule gives only ~300 kWp (the 247 kWp roof above plus the
-canopies); more there means ground mount on the plot behind the building
-or the phase 2 roof.
+The flat office roof would add ~65 kWp around its three AC units (estimate
+from the [calculator](fleet-calculator.html) drawing), ~640 kWp with every
+roof and canopy covered. The plans carry **the factory roof only, ~520 kWp**,
+with the office roof and the canopies built PV-ready: structure rated for
+the panels (~20 kg/m² plus wind uplift), conduit and a cable route to the
+main board and a spare way for a later inverter, inside the building and
+site works (estimate). Their ~120 kWp go on when the load grows (the second
+Duplex system), for ~2.4M to 3.1M THB at today's prices. On the Mueang Chi
+hall the factory roof takes ~247 kWp and its canopies are PV-ready too.
 
-**What ~640 kWp means on the grid** (October 2026):
+### PV size with biomass steam
+
+With biomass steam the plant's running load is ~230 kW (no electric
+boilers), and a factory on PEA's grid cannot sell its surplus, so the array
+should not outgrow what the plant uses while the sun is up. An hourly
+sketch of a year (October 2026: two shifts on 300 days, ~60 kW off-shift
+base load, the 271 kWh battery, PEA TOU 3.2.2 with Ft, 23,000 THB/kWp
+installed, 400 THB/kWp a year upkeep, an inverter set in year 12, 25 years
+at 8 %; synthetic Chiang Mai sun profile, not PVGIS) gives, as estimates:
+
+| Array | Used on site | Saved a year | Payback | IRR | NPV | Payback of the last 50 kWp |
+|---|---|---|---|---|---|---|
+| 300 kWp | 94 % | 1.5M THB | 5.0 yr | 19 % | 7.1M | 5.4 yr |
+| 450 kWp | 90 % | 2.2M | 5.2 yr | 18 % | 9.7M | 6.0 yr |
+| 500 kWp | 88 % | 2.4M | 5.3 yr | 18 % | 10.2M | 7.1 yr |
+| 550 kWp | 85 % | 2.5M | 5.5 yr | 17 % | 10.3M | 9.0 yr |
+| 640 kWp | 78 % | 2.7M | 6.0 yr | 15 % | 9.8M | 14.6 yr |
+
+- **The best array is ~500 to 550 kWp, about the ~520 kWp factory roof.**
+  Above ~550 kWp each added kWp loses money: most of its yield is
+  curtailed on Sundays and at midday.
+- **The optimum follows the running load**, at ~2.3 kWp per kW: ~440 kWp
+  at 180 kW, the full ~640 kWp at 280 kW. Panel price, discount rate and
+  yield move it by only about 30 kWp. So the PV-ready roofs and canopies
+  are filled when the second Duplex system raises the load.
+- With electric steam (~430 kW running) every added kWp up to ~640 still
+  paid back in ~5.5 years, which is why the array was briefly sized to
+  every roof.
+
+**What ~520 kWp means on the grid** (October 2026):
 
 - **Zero export.** A factory on PEA's grid cannot sell its surplus: the
   interconnection needs a zero-export controller or reverse-power relay,
   and net billing is limited to small users
   ([CapSolar, rooftop solar regulations 2026](https://capsolar.co.th/en/knowledge/rooftop-solar-regulations-thailand)).
-  An hourly sketch (two shifts on 300 days, ~60 kW off-shift base load,
-  the 271 kWh battery; estimate) puts **~85 % of the ~900 MWh yield to
-  use on site**; the rest, mostly on Sundays and holidays, is curtailed.
-  With electric steam the launch plant draws ~2,000 MWh a year, so the
-  array covers ~38 % of it.
+  The sketch puts **~87 % of the ~730 MWh yield to use on site** (~633 MWh
+  in the calculator); the rest, mostly on Sundays and holidays, is
+  curtailed. With biomass steam the launch plant draws ~1,036 MWh of
+  electricity a year, so the array covers ~61 % of it.
 - **Permits.** Since Ministerial Regulation No. 3 B.E. 2567 (in force
   28 December 2024) rooftop solar outside industrial estates is not a
-  factory at any size, so no Ror.Ngor.4 licence; at ~500 kVA of inverters
+  factory at any size, so no Ror.Ngor.4 licence; at ~430 kVA of inverters
   the array stays under the ERC's 1,000 kVA line and needs an exemption
   notification, not a generation licence; PEA's interconnection review
   takes 3 to 6 months and is filed alongside procurement
@@ -151,8 +183,8 @@ or the phase 2 roof.
   at CapSolar ([CapSolar PPA](https://capsolar.co.th/en/services/ppa)).
   The calculator's 3.0 THB/kWh is ~21 % below the ~3.8 THB/kWh blended
   rate, inside CapSolar's range but above MEAei's usual discount (estimate,
-  to quote); the launch plant's bill (~0.75M THB a month before solar, calculator)
-  clears the threshold.
+  to quote); the launch plant's bill (~0.36M THB a month before solar with
+  biomass steam, calculator) clears the threshold.
 
 ### Energy efficiency architecture: recover before generating
 
@@ -295,10 +327,9 @@ not a cost one.
 (weekday daytime at the peak rate, weekends and early mornings at
 off-peak, Ft included), so the 247 kWp roof saves ~1.2M to 1.3M THB a year
 and pays back in **~3.8 to 5.4 years** at 20,000 to 26,000 THB/kWp
-installed. The full ~640 kWp array uses ~85 % of its yield on site, saves
-~2.8M to 3.0M THB a year and pays back in **~4.2 to 5.9 years**; the
-last ~340 kWp, more of whose yield is curtailed, take ~4.9 to 6.3 years
-(estimates; Thai market prices checked October 2026 in the
+installed. The ~520 kWp factory roof of the plans uses ~87 % of its yield
+on site with biomass steam, saves ~2.3M to 2.5M THB a year and pays back
+in **~4.1 to 5.8 years** (estimates; Thai market prices checked October 2026 in the
 [utilities CSV](finance/utilities-investment.csv): DEDE's PV status report
 gives 22 to 25 THB/W for factory systems of 10 kW to 1 MW in 2023,
 installers quote 18 to 25 THB/W in 2026). It does not lower the demand charge, because the peak window