commodity demand sa — SA1

South Australia's spot price sits at $68.84/MWh at 06:30 AEST with demand at 1,194.5 MW — a moderate Sunday evening level sitting well below the day's peak of approximately 1,527 MW reached around 19:30 AEST. The price-demand relationship across today's trading profile is pronounced: when demand climbed through the 1,400–1,530 MW band during the morning and afternoon, prices held in the $33–$86/MWh range, with a brief spike to $262/MWh at 17:55 AEST. As demand has since eased into the low-to-mid 1,100s MW through the evening, prices have firmed to the high $60s–low $70s/MWh — a counter-intuitive dynamic driven by solar output falling away at sunset, leaving wind (311.5 MW) and gas CCGT (42 MW) to carry more of the load against a relatively inelastic evening demand profile.

The overnight trough earlier today was extreme: demand collapsed to as low as 13 MW of scheduled grid load around 13:00 AEST (UTC+10:30), corresponding with a Minimum System Load event that AEMO subsequently cancelled at 13:50 AEST. At those levels, prices reached -$119/MWh as behind-the-meter solar suppressed grid-measured demand to near zero. The price-to-demand correlation through that overnight-to-midday arc is clear: negative prices persisted from approximately 23:30 AEST through to 07:15 AEST as demand remained below 1,000 MW, only turning positive and rising above $40/MWh once demand crossed the ~1,100 MW threshold during the morning ramp.

Forecasts for the next few intervals point to prices easing from current levels, with the 07:00 AEST target showing consensus near $70/MWh but the 07:30 AEST interval forecast stepping back toward the $44–$47/MWh range as demand tracks lower on a Sunday evening trajectory. Beyond 08:00 AEST (18:00 UTC), forecast prices lift sharply into the $76–$138/MWh band, reflecting the pre-dawn period when grid-measured demand rises off the overnight floor but wind generation variability introduces supply-side uncertainty. This morning's low-demand, over-supply conditions are likely to repeat, and traders should anticipate negative pricing windows returning from approximately midnight through to mid-morning AEST as the Sunday-to-Monday pattern plays out.

One market notice warrants attention for SA-adjacent flows: an unplanned outage of the Larcom Creek–Calliope River 275 kV line in Queensland at 02:32 AEST today has invoked constraint set Q-LCCP_8859, affecting NSW–QLD interconnector flows. While this directly impacts the northern NEM, any tightening of interconnector headroom into Victoria can indirectly influence SA's import/export balance via the Heywood and Murraylink links, which is a secondary factor supporting the current modest price elevation in SA despite relatively soft demand.