NEM wind output hits 10,349MW record as overnight prices face renewed pressure
Record wind generation and rising battery capacity are flattening NEM spot prices, testing the revenue case for new firming capacity.
NEM-wide wind production hit a new all-time record of 10,349MW in the 21:20 dispatch interval on Wednesday (2026-07-01), according to WattClarity data, eclipsing the previous mark of 10,159MW set on 25 July 2025 by 190MW.5
That record came with a wrinkle for spot price forecasting: it occurred while roughly 450MW of wind was still being curtailed, meaning the physical ceiling for wind output was higher still.5 The gap between what the fleet can produce and what the market can absorb is widening, and that gap is showing up in wholesale prices.
The Australian Energy Market Operator noted in its spring-quarter reporting that wholesale power prices averaged $50 a megawatt hour across the national market, a 44 percent reduction compared with 2024 and a $37 a megawatt hour drop on the prior comparable period.1 Mild, sunny conditions in spring pushed prices down as renewables crossed the 50 percent share milestone for the quarter.1
The weather-driven pressure is not new, but the scale of the fleet behind it is. AEMO now reports 2.8GW of behind-the-meter batteries that respond to prices but are not centrally dispatched, equivalent to the power capacity of Eraring Power Station.3 Those resources sharpen the price response across intra-day intervals, compressing intra-day volatility even as inter-day and event-driven swings become more important.3
The record wind print on Wednesday (2026-07-01) came when the market still had hundreds of megawatts of headroom to curtail, which traders read as a sign that the overnight and early-evening supply stack has room to push spot prices lower than the seasonal norm.5 With solar saturating the middle of the day and wind now setting records into the evening shoulder, the price curve flattens across a broader slice of the trading day.
None of this is lost on investors modelling the future generation mix. In the base case, the fleet ends up with 50GW of wind, 49GW of solar and 45GW of batteries, plus about 10GW of gas, according to modelling cited by RenewEconomy.2 That buildout assumes storage charging and discharging are decided by the model rather than assumed, and that scarcity prices emerge from demand-response and value-of-lost-load tiers when supply tightens.2
The high-cost-of-capital sensitivity paints a different picture, building 62GW of batteries and only 7GW of gas, with carbon-priced gas in the mix displacing some medium-duration battery storage.2 Either path requires substantial construction before firming capacity matches the renewable buildout, and the revenue signals for that investment are being tested right now by exactly the kind of high-renewable, low-price periods that the 2026-07-01 record wind output exemplified.
There is plenty of building to do yet, and the current spot price backdrop does not obviously reward it.2 Extended periods of bearish pricing from weather-driven renewables risk pushing some merchant projects past their investment hurdles at a time when the grid still depends on ageing coal plants that are exiting faster than replacement firming arrives.6
AEMO has been here before. In June 2022 the operator suspended the spot market across the eastern states to stem a crisis, taking direct control of generator dispatch until further notice.4 That intervention remains the cautionary backdrop for every forecast of a smooth transition; the current weather-driven price weakness is the opposite problem, but it pressures the same investment case.
The near-term signal is the winter peak, where AEMO's own planning documents have flagged supply risks as coal retirements accelerate.6 The record wind output proves the renewable fleet can deliver in volume. Whether it can consistently deliver in the evening ramp when the sun sets and the wind eases, without pulling spot prices through the floor that makes firming investment viable, is the test facing developers right now.5 The next round of capacity auction results will show whether investors still see a path.