NEM wholesale prices collapse 47% as record new capacity pipeline tests coal retirement math
East coast Australian power prices fell to $74/MWh in Q2 as 40 GW of new supply nears commitment, sharpening the reliability question.
A record pipeline of new generation and storage is putting Australia on a stronger path to maintain electricity reliability as ageing coal-fired power stations retire, AEMO said in its 2026 Electricity Statement of Opportunities, published in late August. Around 40 GW of new capacity is now committed or anticipated, with a further 33 GW supported by government programs — against a total NEM size of just 77 GW as of August 24 (2026-08-24).5
The buildout is arriving faster than many expected. Around 9 GW of new capacity was added over the past year, a new yearly record, while 24 GW moved into committed or anticipated status since last year's ESOO. But the price data tells a more complicated story about what that capacity is actually doing to market economics.5
Wholesale electricity prices across Australia's National Electricity Market averaged $74/MWh in the second quarter, down $66/MWh, or 47%, from Q2 2025, according to JD Supra's July 2026 update drawing on AEMO data. The collapse in spot prices is arriving at the same moment AEMO is framing the supply outlook in optimistic terms.4
East coast wholesale gas prices fell to their lowest level since Q2 2021, averaging $9.08 per gigajoule, driven by lower domestic demand. South Australia was the only NEM region to experience any material price volatility. Grid-scale battery storage increasingly shifted energy and influenced price outcomes, though the July update does not quantify how much of the spot price decline is attributable to storage arbitrage versus renewable oversupply.4
Queensland offers a window into the supply mix shift. Average wind generation in the region rose 80% to a new all-time high of 842 MW, the largest regional increase across the NEM.4
The reliability question is where optimism meets friction. AEMO's MT PASA modelling run published on Tuesday (2026-08-04) flagged shortfalls forecast for Victoria and South Australia. WattClarity, which tracks the operator's Medium Term Projected Assessment of System Adequacy, cautioned that "the devil is in the details" for those projections.3
Anyone who traded the NEM through the 2022 crisis knows how quickly the reliability picture can shift. In June 2022, AEMO suspended the spot market across the eastern states to stem outages and directed generation to the grid, an unprecedented intervention. The current buildout is supposed to make that scenario obsolete. The shortfall flags for Victoria and South Australia suggest the transition period still carries operational risk.1
AEMO's own framing of the market has shifted. Its CEO, speaking at Australian Energy Week on June 11 (2026-06-11), said the market has changed fundamentally from its start, when there was a clear boundary between supply and demand, and that the rules and frameworks built around that old structure still permeate the industry.2
The Draft 2026 Integrated System Plan attached a dollar figure to one piece of the solution: total system cost can be reduced by $7.2 billion if consumer energy resources respond to market signals. That number feeds directly into the ISP, which guides investment decisions across the grid.2
Traders will be watching whether the collapse in wholesale prices starts to slow the committed pipeline, or whether government-supported projects keep flowing regardless of merchant economics. The 33 GW backed by government programs is the buffer that did not exist in previous cycles.5
Wholesale prices and reliability signals are now pointing in opposite directions. With shortfall flags already on the table for Victoria and South Australia heading into peak season, that divergence — not the record buildout itself — is the specific risk to track through the Australian summer.4,5