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SAP 10.2 Appendix M1 §6 (PDF p.94, lines 5510-5513): "apply the normal import electricity price to PV energy used within the dwelling and the 'electricity sold to grid, PV' price from Table 12 to the energy exported. In the case of the former, use a weighted average of high and low rates (Table 12a)." `_pv_dwelling_import_price_gbp_per_kwh` was returning the bare off-peak LOW rate (5.50 p/kWh on a 7-hour tariff) for the PV-used-in-dwelling credit. PV self-consumption displaces the dwelling's "all other uses" electricity (lighting / appliances / pumps), which on an off-peak tariff bills at the Table 12a Grid 2 ALL_OTHER_USES weighted blend, not the low rate. On simulated case 19 the worksheet (252)/(269) credits PV-used-in-dwelling at 14.3110 p/kWh = 0.90 × 15.29 + 0.10 × 5.50; we credited it at 5.50, under-crediting onsite PV by ~£0.088/kWh on every off-peak PV cert. Fix delegates to `_other_fuel_cost_gbp_per_kwh(tariff, prices)` (the same ALL_OTHER_USES rate): STANDARD tariff still returns the flat Table 32 code 30 13.19 p/kWh (golden cohort unchanged — all 2412 tests pass); off-peak returns the weighted high/low blend. Call sites now pass the resolved `_rdsap_tariff(epc)`. The now-unused `_off_peak_low_rate_gbp_per_kwh_via_meter_heuristic` (its only caller) is removed. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> |
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| conftest.py | ||
| test_lambda_packaging.py | ||