Regional Outlook — SA1 — Wednesday 6 May 2026

The SA spot price sits at $44.02/MWh as of 06:30 AEST, with total demand at 1,411.7 MW — a moderate morning load level consistent with the autumn shoulder period. This is a sharp normalisation from the elevated pricing seen around 07:00–09:30 AEST yesterday (UTC+2 offset applied), when intervals were repeatedly clearing in the $118–$148/MWh range during the evening peak. Across the past 24 hours, prices traced a classic overnight trough — touching zero and briefly negative through the 11:30–16:30 AEST window — before recovering into the $35–$44/MWh range from 06:00 AEST this morning as demand climbs with the morning ramp. The 24-hour price profile reflects the strong wind generation carrying overnight load at minimal marginal cost.

The current generation mix is wind-dominated: wind is producing 592.22 MW against gas CCGT at 115.56 MW, with solar at zero (pre-dawn) and gas OCGT offline. Renewable penetration sits at 83.67% and carbon intensity is 0.08 tCO2/MWh — among the lowest readings across the recorded history in this dataset, which tracked intensity as high as 0.45 tCO2/MWh during yesterday's evening peak when synchronous generation was carrying a heavier share of load. Wind potential is rated at 4.2 on current conditions with temperatures at 11.9°C and 34% cloud cover; today's outlook shows average wind potential lifting to 4.7 with 86% cloud cover, meaning solar contribution will remain constrained through the day — the daily solar potential average is just 1.4.

Predispatch forecasts for the 07:00 AEST half-hour (21:00 UTC target) are tightly clustered around $16–$21/MWh across all run times, indicating the market expects prices to ease from the current $44/MWh as the morning demand build stabilises. The 07:30 AEST half-hour (21:30 UTC) shows more spread in forecasts — earlier runs flagged $53–$77/MWh but more recent runs have collapsed to the $18–$44/MWh range — suggesting some residual uncertainty around that period, possibly reflecting wind output variability or the gas dispatch stack. Load window signals from 08:30 AEST onward (22:30 UTC+) are pointing to sub-$10/MWh conditions through the middle of the day, with multiple windows forecast at negative prices from 09:00 AEST (23:00 UTC) through the early afternoon, which is consistent with strong wind and near-zero solar demand on load.

The most operationally significant recent notice for SA is the now-cancelled AEMO intervention (Market Notice 144052), which directed Origin Energy's Quarantine PS Unit 5 to synchronise at 11:00 AEST on 6 May for voltage control purposes, with cancellation at 13:00 AEST once sufficient synchronous generation was available. The foreseeable intervention notice (144048) had flagged voltage adequacy risk in SA — a recurring issue during periods of very high non-synchronous penetration. This has resolved without ongoing constraint, but engineers should note the pattern: with wind at 84% penetration overnight and gas OCGT offline, voltage support margins in SA are tight in these conditions. The VIC1 contingency recl