AEMO flags a June 10 reserve shortfall for South Australia in its third notice in two days

AEMO flags a June 10 reserve shortfall for South Australia in its third notice in two days Three successive AEMO market notices since June 7 forecast South Australian reserves falling below requirement on June 10, a tightening the state's spot price has yet to register. At 07:39 on Monday (2026-06-08), AEMO issued its third market notice in two days flagging a lack-of-reserve condition in South Australia for Wednesday (2026-06-10). Notice MN144207 forecast a capacity reserve requirement of 606 MW between 0800 and 1100, against a minimum capacity reserve available of just 443 MW. A second window, 1530 to 1630, showed 456 MW required versus 379 MW available.³ That matters because an LOR2 forecast is the point at which AEMO projects reserves slipping below the cushion it wants to keep the system secure against the loss of a large generator. It is the level at which the operator begins leaning on the market, and on its own intervention tools, to close the gap before real-time. Three notices in 48 hours on the same day and state is not noise.³ The sequence started with MN144205 at 10:50 (NEM time) on Sunday (2026-06-07). That notice put the forecast capacity reserve requirement at 744 MW between 0800 and 1000 on Wednesday (2026-06-10), with minimum reserve available of 542 MW. A gap of roughly 200 MW.³ By 18:05 on Sunday (2026-06-07), MN144206 had reshaped the window to 0830 through 1700 and lowered the headline numbers, requirement to 571 MW against 384 MW available. The shortfall held near 190 MW even as the absolute figures fell, which suggests the operator was revising both demand and the supply stack, not simply walking back the warning.³ The Monday (2026-06-08) update split the risk into a morning block and a late-afternoon block, the latter catching the evening solar rolloff. Across all three notices the pattern is consistent: a forecast requirement somewhere between 456 and 744 MW, and available reserve trailing it by between 77 and 202 MW. The exact MW shifts run to run. The direction does not.³ What sits underneath those numbers is wind and solar. South Australia runs one of the highest renewable penetrations in the National Electricity Market, and its reserve adequacy on any given afternoon turns on the unconstrained intermittent generation forecast. WattClarity noted that as at the 07:55 dispatch interval on Monday (2026-06-08), the forecast convergence widget in ez2view was being used to track the UIGF for both wind and solar across those Wednesday (2026-06-10) periods.³ That is the variable that will decide whether the Wednesday (2026-06-10) LOR2 firms, eases, or clears entirely. If the wind forecast converges higher as the event approaches, the available-reserve line lifts and the notices can be cancelled. If it converges lower, an LOR2 forecast becomes an LOR1 or an actual reserve shortfall, with the operator dispatching reserves and, in the worst case, directing plant.³ For now the market is relaxed. South Australia's spot price sat at A$104.58 on Sunday (2026-06-07), a level that carries none of the premium you would expect if traders were positioning for a binding reserve event two days out.³ Either the forward market is discounting the warning, betting wind shows up, or the risk is genuinely concentrated in two narrow windows that the daily average smooths over. There is a reason for the calm beyond complacency. South Australia added record clean output through early 2026, and its battery fleet, much of it built beyond the minimum required for firming contracts, can arbitrage exactly the high-price intervals an LOR2 tends to produce.^1,2 Those batteries are free to play the market when they are not meeting other obligations, and a forecast tight afternoon is precisely when they would.² The thing to watch is forecast convergence between now and Wednesday morning (2026-06-10). Each fresh market notice will reset the requirement and the available-reserve figure; a widening gap or a move to a higher LOR level is the signal that wind has underdelivered against the UIGF. A run of cancellations is the signal it has not. The spot price is currently betting on the second outcome.³