Biomass: reported northern fuel prices (October 2026)

No public price index exists; DEDE lists buyers, not prices. Reported
market prices: fresh chips 1,350-1,800 THB/t (LH Bank, Mar 2026),
rubberwood firewood >1 THB/kg farm gate (OIE RIU 2026, doubled since late
2025), corn residue 2 THB/kg (Sunsweet, Mae Chaem), rice husk ~1.5 THB/kg,
pellets 3,000-5,000 THB/t. Planning price 1.35-2 THB/kg delivered, so the
mature fuel bill is ~0.6M-1.2M THB/yr (was 0.35M-0.8M): still a quarter
to a tenth of electric steam. Prices follow diesel; Ratch Pathana's Pa Sak
(Lamphun) buying centre is the local price-setter. Sources filed under
docs/finance/biomass/; sustainability.md and README follow.

README.md

@@ -90,15 +90,15 @@ The detail lives in dedicated documents:
   the full needs list per production step with supplier tables and contacts
 - [Sustainability](docs/sustainability.md): the solar installation (Deye
   inverters, 271 kWh Gobel Power battery stack), the PEA grid tariff and
-  what it decides (biomass steam at about a tenth of the cost of electric,
-  PV rather than solar thermal), the zero contaminated water commitment,
+  what it decides (biomass steam at a quarter to a tenth of the cost of
+  electric, PV rather than solar thermal), the zero contaminated water commitment,
   and the materials strategy
 - [Worker safety](docs/worker-safety.md): safety training, galvanics clean
   rooms and decontamination, PPE
 - [Biomass fuel strategy](docs/biomass.md): the 60 rai own-grown coppice
   idea (with the forestry-classification check that comes first), northern
-  agricultural waste as the main supply, and the staged electric-to-biomass
-  path
+  agricultural waste as the main supply, reported northern fuel prices
+  (October 2026) and who sets them, and the staged electric-to-biomass path
 - [BOI investment promotion](docs/boi.md): the promotion strategy (Group B
   base activity plus solar, automation, and R&D measures for the tax value),
   requirements, Northern-region angle, and why BOI approval precedes
@@ -208,7 +208,8 @@ docs/
 │   └── pressing-line.md   Press fleet strategy and equipment plan
 ├── finance/               Project cost overviews, revenue model,
 │                          construction RFQ, PEA electricity tariff
-│                          schedule (pea/)
+│                          schedule (pea/), biomass fuel market
+│                          reports (biomass/)
 ├── suppliers/             Supplier contacts, vendor landscape, supplier map
 ├── artist-platform.md     Upload, price calculator, fan-funded pressing
 ├── biomass.md             Biomass fuel strategy and the 60 rai coppice idea