Add Warm Home Discount planning doc (#502)#1735
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#502 notes that the WHD has criteria varying by energy company and isn't specified ahead of time. Persist the modelling plan in-repo so the actual complexity is documented (and a defensible v1 scope is agreed before any code goes in). The page covers: - the two-group structure (auto Core Group 1 keyed on Pension Credit Guarantee Credit, EPC-based Core Group 2 in England with the 2022-23 reform under SI 2022/687, application-based Core 2 in Scotland and Wales under SI 2022/690), - the three-phase implementation route: Core 1 (~1m households, the cleanest target) first, then EPC-keyed Core 2 in England with the EPC + qualifying-benefit logic, then Scotland/Wales application- based with a stochastic would_claim flag, - an alternative v1 scope ("Core 1 only, document Core 2 as under-imputed") that captures the most policy-relevant slice at minimal modelling cost, - data needs (Ofgem annual WHD reports, DWP Pension Credit caseload, VOA/ONS EPC distribution for Phase 2), - open questions on scheme-year vs simulation-year semantics and whether Core 1 needs a take-up gate (recommendation: no).
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Summary
docs/book/programs/gov/ofgem/warm-home-discount-plan.mdcovering:pension_creditmachinery), then EPC-keyed Core 2 in England, then Scotland/Wales with a stochasticwould_claimflag;Pure documentation; no code changes.
Test plan
programs/gov/ofgem/.🤖 Generated with Claude Code