A battery needs a genuine optimiser because today's charging affects tomorrow's trades. A wind or solar farm has no such coupling — each 5-minute interval is an independent decision: stop generating whenever the expected price is below your threshold T. T is what a curtailed MWh really costs you. A farm selling only into the wholesale market uses $0. A farm earning green certificates (LGCs) keeps generating a little below $0 — though with LGC prices down to roughly $5/MWh (mid-2026, from ~$45 historically) that case is now thin — and fixed-price contracts can justify much deeper thresholds. Pick T with the control below; there is no single right answer, so we don't pretend there is.
Forward view: AEMO's official short-term price forecast (PREDISPATCH, 30-minute steps), refreshed each rebuild. Each farm's expected output is its own typical day — the average pattern over its latest month with at least 20 days of data (never the current partial month) — a proxy for availability, not a weather forecast. Planning-scale indications, not dispatch instructions.
Scorecard: a best-case look-back — the revenue each farm would have kept had it stopped generating in every interval priced below T, versus what its metered output actually earned. Metered output already includes whatever curtailment the operator did, so the number shown is what was still left on the table. In practice, semi-scheduled units curtail through their bids, not an off switch. Wholesale-only: no certificate, contract or FCAS cashflows.
Sorted by extra revenue — what perfectly switching off below T would have kept. Wholesale-only, best-case look-back.