Khalim Conn-Kowlessar c6eaa53931 feat(billing): price house coal + heat network as documented proxies ... Coal and heat networks have no national retail/cap rate, so the snapshot left them null and BillDerivation raised UnpricedFuel — dropping those certs from an offline cohort run. Add researched proxy rates (fuel-input basis, sources + arithmetic in the JSON _note/_gaps): COAL 7.13 p/kWh (NEP Nov 2025 coal uprated + DESNZ DUKES house-coal GCV) and HEAT_NETWORK 16.0 p/kWh + 69.4 p/day (Insite Energy operator sample; indicative, schemes vary ~8-30). Both flagged proxy/indicative — sense-check estimates, not market rates. Existing curated fuels are unchanged. Replaces the unpriced-raises pin for these two with a positive rate pin; off-peak stays unpriced pending the day/night accessor. Golden cohort now runs 57/57 offline with zero errors. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>		2026-06-04 10:21:16 +00:00
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fuel_rates_2026_q2.json	feat(billing): price house coal + heat network as documented proxies	2026-06-04 10:21:16 +00:00