AEMO issues 500 directions to 5 GW of plant before suspending NEM
Australia's market operator suspended the entire NEM after extreme prices, cold weather and generator outages hit supply.
AEMO issued around 500 directions covering more than 5 GW of generation plant, then suspended the entire National Electricity Market — a step that CEO Daniel Westerman called unprecedented at the Australian Energy Week conference on Thursday (2026-06-11). The decision came during one of the most challenging periods in AEMO's history, Westerman said.4
Extreme prices, a cold snap and multiple generator outages combined to drive the NEM beyond what direction-setting alone could manage. AEMO took the extraordinary step to keep electricity supply reliable for consumers, Westerman said.4
The event arrived against a generation fleet already in transition. Nearly 40% of the NEM's coal fleet has retired since market start, Westerman said, and the average age of stations still running is 38 years.4
Consumer-owned generation has filled much of the gap. More than 4 million rooftop solar systems now sit on one in three Australian homes, and Westerman said the combined generating capacity of those consumer resources is now larger than the capacity of remaining coal-fired power stations.4
At times, those behind-the-meter systems meet more than 60% of all NEM demand. On a clear summer afternoon, that figure eases pressure on the grid. On a winter evening when households switch on heating, it contributes nothing. The same shift that has made the NEM one of the world's most renewable-penetrated grids has made it harder to manage when solar output falls away and load rises after dark.4
The June (2026-06) suspension was not the first signal that the NEM was under strain. In late January (2026-01-28), demand across Australia's largest power grid hit a record for the fourth quarter of 2025, even as renewable energy supplied more power than fossil fuels across the country for the first time.1
Until the June crisis, price dynamics had been unusually calm. Internal AEMO discussions noted that prices had been "largely subdued" over several months through summer 2025-26, with analysts pointing to the rapid expansion of battery storage as a dampening factor.5 A break in that "volatility drought" hit Tasmania on Sunday (2026-06-21) and spread to South Australia across Sunday (2026-06-21) and Monday (2026-06-22), weeks after the full NEM suspension.5
The NEM's regional structure means stress does not fall evenly. New South Wales and the Australian Capital Territory together account for about 34% of the market, according to a May (2026-05-12) research report, giving those two states outsized weight when the grid comes under pressure.2
Industry participants at a separate conference earlier in 2026 flagged a related concern. Many wind auction outcomes in Australia were struck against materially different cost assumptions, according to a KPMG analysis presented at the Australian Wind Industry Forum, raising questions about how much of the contracted pipeline will be delivered to offset continuing thermal retirements.3
AEMO's decision to reach for full suspension only after exhausting 500 directions across more than 5 GW of plant signals how broadly the stress had spread.4 The coal fleet, with stations averaging 38 years in operation, will continue to thin the dispatchable stack available for winter-peak events as retirements proceed.4
The consumer solar base whose aggregate capacity now exceeds remaining coal-fired generation produces nothing at the evening demand peaks that cold snaps create.4 Whether the June suspension is now priced into NEM forward contracts as a repeatable risk, or is still being treated as a one-off, is what winter pricing will eventually resolve.5