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Slice 2 of Bill Derivation. BillDerivation(fuel_rates).derive(breakdown) takes a delivered-energy breakdown (per-section EnergyLine(section, fuel, kwh) + exported_kwh) and produces a Bill: per-section kWh + cost, standing charges, SEG credit, and total. - Each end-use line billed at its fuel's unit rate. - Standing charge added ONCE per distinct fuel used (a meter, not an end use); off-gas fuels carry 0 so contribute nothing — no metered/unmetered special case. - SEG export credit subtracted. - Deterministic (ADR-0006); raises UnpricedFuel (via FuelRates) on an unpriced fuel (e.g. heat network) rather than billing at a wrong default. Pure domain — no calculator dependency; the SapResult->EnergyBreakdown adapter is slice 3. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> |
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| utilities | ||
| __init__.py | ||
| conftest.py | ||
| test_lambda_packaging.py | ||