Regional Outlook — SA1: Wednesday 27 May 2026

The South Australian spot price sits at $145.12/MWh at 06:30 AEST, with total demand at 1,444.65 MW. This is at the lower end of the overnight range, which peaked at $240.37/MWh around 08:50 AEST and sustained a prolonged elevated band of $185–$225/MWh through the 07:30–09:00 AEST window. The 24-hour average across the price history runs well above $165/MWh, making the current interval a relative trough in what has been a persistently firm overnight and morning session. Weather is a contributing factor: Adelaide sits at 10.7°C with 72% cloud cover, wind near-calm at 2 km/h, and a heating demand index of 7.3 — a typical winter morning demand profile with no solar contribution at this hour.

The generation mix at 06:30 AEST is dominated by gas, with CCGT contributing 495.79 MW and OCGT 457.95 MW, together accounting for roughly 95% of local generation. Wind is contributing 91.6 MW and battery storage a marginal 3.36 MW in net output. Solar output is zero, consistent with pre-dawn conditions. Renewable penetration sits at 9.06% — the lowest point in the overnight carbon history, which ranged between 8.45% and 38.97% across the past 24 hours, with the stronger renewable periods occurring in the early hours of the morning when wind was more active. Carbon intensity stands at 0.5155 tCO2/MWh, the highest recorded in the dataset, reflecting the current gas-heavy despatch profile. The daily outlook for today shows 93% average cloud cover and negligible wind and solar potential, meaning the generation mix is unlikely to shift materially through daylight hours.

Pre-dispatch forecasts point to a significant and sustained price escalation through the morning trading peak. Forecasts for the 07:00 AEST half-hour (21:30 UTC) cluster between $210–$327/MWh across successive runs, with a median in the $225–$280/MWh range. The 07:30 AEST interval (22:00 UTC) is similarly forecast in the $225–$300/MWh band, and forecasts extending through 08:00–10:30 AEST (22:30–00:30 UTC) are predominantly in the $240–$320/MWh range, with multiple runs touching the $299.44/MWh cap proxy. This escalation aligns with the morning demand ramp — demand peaked above 1,970 MW earlier in the price history — and the absence of both solar generation and meaningful wind output today.

Two market notices are directly relevant to SA operations. Notice 144147 (issued 10:35 AEST) records a non-conformance event for unit LGAPBS1 in SA1, involving a -10 MW deviation for a single interval at 20:30 AEST yesterday — a minor and resolved operational event. Notice 144139 records an ongoing inter-regional transfer limit variation on the Tailem Bend 275 kV East Bus with constraint set S-TB275_E_BUS active on the V-SA interconnector, in force since 24 May; this constraint on Murraylink/VIC-SA flows remains live and will continue to limit SA's access to Victorian imports, a factor reinforcing the gas-dominant local