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.

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