regional sa — SA1

The South Australia spot price sits at -$2.74/MWh as of 06:30 AEST, with demand at 1,431 MW. Negative pricing has dominated since approximately 23:00 AEST last night and has been sustained for the bulk of the past seven-plus hours, reaching an intraday trough of -$14.86/MWh during the 04:00–05:00 AEST window. This contrasts sharply with the evening prior, when prices spiked repeatedly above $200–$370/MWh between 09:00 and 09:30 AEST — a range consistent with tight evening supply conditions. The 24-hour price profile is therefore deeply bipolar: elevated thermal pricing during the pre-dawn and evening peaks, and sustained negative or near-zero pricing through the middle of the day.

The current generation mix is wind-dominant. Wind is contributing 473 MW and gas CCGT 41 MW, with solar at zero and gas OCGT offline — consistent with the post-dawn lull before rooftop and utility solar ramps up. Renewable penetration sits at 91.97% and carbon intensity is 0.0394 tCO2/MWh, both near the day's best readings. Earlier this morning, between approximately 10:30 and 15:30 AEST, renewable penetration exceeded 95% across multiple half-hour periods, with carbon intensity dropping as low as 0.0195 tCO2/MWh — the cleanest generation profile of the day. The 24-hour carbon trend shows a sharp deterioration around 10:00–11:30 AEST (intensity spiking to 0.37 tCO2/MWh as wind backed off and gas carried more load), before steadily improving as wind recovered through the afternoon and evening.

Predispatch forecasts for the 07:00 AEST half-hour (21:00 UTC) point to prices in the range of -$2.77 to -$2.82/MWh, with the 07:30 AEST window forecast at approximately -$0.11/MWh — suggesting prices are expected to lift marginally as demand climbs into the morning. Load window data indicates negative pricing is forecast to persist well into the 08:30–09:00 AEST period, with the deepest negative forecasts (-$20/MWh or lower) concentrated between approximately 08:00 and 09:30 AEST (UTC 22:00–23:30), likely reflecting strong rooftop solar generation coinciding with low minimum demand. Flexible load operators and battery charging strategies should note this window as optimal for consumption.

On market notices, the most relevant active SA1 notice is the reclassification and subsequent cancellation of a credible contingency event involving the Penola West – South East 1 132kV and Kincraig – Penola West 1 132kV lines, which were temporarily reclassified due to lightning activity and reverted to non-credible at 03:14 AEST today — no constraint sets were invoked, so market impact was minimal. Traders should also note a broader pattern of recent SA intervention activity: AEMO issued directions in SA on 5 and 6 April related to voltage management, requiring Barker Inlet PS and Quarantine PS units to synchronise. Those directions are now cancelled, but they signal that voltage security in SA during high-renewable, low-demand periods remains an