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10 modelling_e2e properties failed with "unmapped SAP code in fuel_code: 10": the billing layer (`sap_code_to_fuel`) had no carrier for Table-32 code 10 (dual fuel, mineral + wood) and raised rather than guess one. SAP 10.2 treats dual fuel as its OWN fuel (its own Table-12 factors), so model it as its own billing carrier rather than collapsing onto wood or coal: - New `Fuel.DUAL_FUEL_MINERAL_AND_WOOD`. - `_CODE_TO_FUEL[10]` -> that carrier. - Fuel Rates snapshot prices it at 7.69 p/kWh — the midpoint of the COAL proxy (7.13) and WOOD_LOGS (8.25). This mirrors SAP's own construction: Table-32 dual fuel (3.99) ~= midpoint of house coal (3.67) and wood logs (4.23). Marked `derived` with a documented _note/_gap/_assumption (like the COAL and HEAT_NETWORK proxies), since there is no retail blend price. A dedicated carrier + rate (vs a one-line map to an existing carrier) keeps the fuel identity faithful to SAP and avoids mispricing dual fuel as pure wood/coal. Tests: code 10 -> DUAL_FUEL carrier; snapshot prices it at 7.69; grid-export codes (36/60) still raise (the genuine no-carrier case). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> |
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| fuel_rates_2026_q2.json | ||