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: