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/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