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AEMO warns NEM market design lags behind rooftop solar, battery shift
Grid operator flags outdated frameworks as renewables supply exceeds fossil fuels for a full quarter.
AEMO CEO Daniel Westerman told Australian Energy Week on Thursday (2026-06-11) that the National Electricity Market's rules still reflect a world with "a clear boundary between supply and demand" — a design that no longer fits the physical system he manages.5
Australia's main grid has already passed the milestone that makes the point concrete. Renewables supplied more power than fossil fuels across the entire fourth quarter of 2025, ABC reported in January (2026-01-28), while fourth-quarter power demand simultaneously hit a record high for the NEM.2
The grid operator is now running harder to keep its forecasting tools in step with that reality. AEMO's Operational Forecasting team provides real-time forecasts for both the NEM and the Wholesale Electricity Market, managing a system where supply-side variability has become the norm rather than the exception.3
Yet the market frameworks have not kept pace. Westerman said the thinking that permeates the industry still treats supply and demand as separate categories, even as rooftop solar and batteries blur that line on every dispatch interval. The Australian Energy Week agenda on Thursday (2026-06-11) illustrated the gap, split between grid-scale and distributed resources as if they belonged to different industries.5
The friction extends to investment signals. At AWIF, the dominant view expressed during the industry outlook panel was that many auction outcomes for wind in particular were struck against materially different conditions — implying contracts priced in one market environment now sit uncomfortably in another.4
AEMO's quarterly reports and operational forecasts are designed to guide investment decisions, but the market response has been mixed. The consensus view on NEM spot prices leans bearish, with bearish signals outweighing bullish ones by a ratio of roughly five to one across tracked indicators.1
That caution has roots in longstanding structural surplus. In 2014 (2014-09-11), industry minister Ian Macfarlane argued that Australia held roughly 9,000 megawatts of excess generation capacity — around nine large power stations worth — and the overhang has not fully cleared.6
The gap between NEM rules and physical reality now runs deeper than simple generation surplus. As distributed resources proliferate, the market's binary view of supply and demand becomes harder to enforce on a dispatch-interval basis. AEMO's Operational Forecasting team has built tools to handle the ambiguity in real time, but operational capability and market design are not the same thing.3,5
The record demand and renewable generation milestone arrived simultaneously in the fourth quarter of 2025, and neither was anticipated as a conjunction when the NEM's current frameworks were written.2 How quickly AEMO translates Westerman's public remarks into actual rule changes is what operators and investors are now waiting to see.