AEMO 2026 ESOO Reports Record Capacity Build as Victoria and South Australia Shortfall Flags Stand
Nine gigawatts added in a year is a NEM record, but AEMO's own modelling had flagged reliability shortfalls in Victoria and South Australia before publication.
AEMO released its 2026 Electricity Statement of Opportunities for the National Electricity Market on Tuesday (2026-08-25), showing around 9 gigawatts of new generation and storage commissioned over the past year, a new yearly record for the grid.4
Around 40 GW of capacity is now committed or anticipated across the NEM, with a further 33 GW supported by government programs. The NEM's total installed capacity sits at approximately 77 GW, so the active development pipeline is roughly equivalent in scale to the entire existing fleet. Since last year's ESOO, 24 GW has shifted into committed or anticipated status, a pace that the report frames as evidence of a strengthening investment trajectory.4
But the headline numbers come with caveats that AEMO's own near-term modelling had already raised. The operator's MT PASA weekly update, published on Tuesday (2026-08-04), identified forecast shortfalls in Victoria and South Australia. Committed capacity and dispatchable capacity in a tight summer are different things. The south-eastern states carry the greatest exposure to ageing coal retirements, and it is there that adequacy risks are most visible in the near-term modelling.2
Data centre load is becoming a non-trivial variable in how the ESOO constructs its demand outlook. Speaking at Australian Energy Week 2026, AEMO's CEO disclosed that average data centre demand across the NEM reached nearly 600 MW in the first quarter of this year. Beyond that, 11 separate data centre projects with an ultimate load of 5.4 GW were working through transmission network connection processes at the time of the speech. That 5.4 GW, if it fully materialises, would represent more than 7% of the NEM's current installed capacity.1
Connection queues in the NEM are long and approvals are contested, so the 5.4 GW figure should be treated as potential load rather than confirmed demand. Yet the direction is one-way. The ESOO's ten-year demand trajectory is shaped by data centre growth alongside broader electrification of homes, vehicles and commercial premises, and both vectors are pointed higher.1
AEMO is managing this expanded planning role while its governance is under scrutiny. An independent review, reported on August 9 (2026-08-09), recommended 14 changes to the operator's governance framework. Central among them is a proposal that governments amend AEMO's constitution to establish 100% government membership, replacing the current arrangement under which industry participants hold formal governance roles as members. The review did not recommend a wholesale restructure.3
For market participants, the governance dimension has a practical edge. AEMO's reliability determinations drive procurement decisions for dispatchable capacity and storage, and its planning assumptions underpin network investment decisions. An operator in the middle of an institutional review introduces uncertainty for anyone modelling long-dated capacity revenue or firming costs against AEMO's adequacy thresholds.3
Domestic east coast gas prices add another layer to the reliability picture. The Wallumbilla Hub spot price was at A$11.05 per gigajoule as of August 24 (2026-08-24), with gas peakers serving as a backstop for NEM reliability during tight conditions. [Live prices]
Victoria and South Australia enter the coming summer with shortfall flags already raised in AEMO's MT PASA modelling from earlier this month (2026-08-04). AEMO's next MT PASA weekly update is the nearest data point for tracking whether committed projects are commissioning fast enough to close the gap before peak demand arrives.4,2