commodity demand sa — SA1

South Australia's spot price sits at -$2.74/MWh at 06:30 AEST with demand at 1,431 MW — a modest recovery from the daily trough of around 1,317 MW reached during the afternoon solar window. The negative price environment that has persisted since approximately 13:00 AEST reflects generation supply well in excess of operational demand, with wind contributing 473 MW and gas CCGT running at just 41 MW, no solar generation active at this hour, and carbon intensity down to 0.0394 tCO2/MWh with renewables at 91.97%. The price-demand relationship today has been notably non-linear: demand peaked near 1,727 MW around 19:00–19:30 AEST at prices of $100–$131/MWh, then fell sharply through the afternoon as demand dropped into the 1,310–1,350 MW range while prices pushed into the -$13 to -$14/MWh band — illustrating how demand compression in the 1,300–1,450 MW range coincides with sustained negative pricing when wind output remains strong.

Demand is now climbing again from the overnight trough, up roughly 114 MW from the 18:00 AEST low, consistent with the early morning load build pattern visible across today's history. The forecast outlook for the 07:00–08:00 AEST half-hours (21:00–22:00 UTC) points to prices near zero to slightly negative, with load windows rated "excellent" in the -$2.74 to -$5/MWh range across the next several hours. As demand rebuilds toward the morning commercial peak — expected to approach 1,600–1,700 MW based on today's trajectory — prices are forecast to lift into positive territory, with the most recent 21:30 UTC forecasts converging around $9–$10/MWh, a significant step up from current levels but well below the $120–$140/MWh range that characterised this morning's demand peak between 08:00 and 09:30 AEST.

Two demand-side factors from market notices are worth flagging. AEMO issued a direction to Barker Inlet PS (voltage control) on 5 April and a further direction on 6 April, both since cancelled, alongside a Forecast LOR1 condition for SA on 7 April between 18:30 and 23:00 AEST — a reserve shortfall that aligns directly with the elevated prices of $100–$370/MWh seen in the 09:00–09:30 UTC (19:00–19:30 AEST) intervals. A contingency reclassification for the Penola West–South East 1 and Kincraig–Penola West 1 132kV lines due to lightning was issued at 01:13 AEST and cancelled at 03:14 AEST, with no constraint sets invoked and no measurable price impact. The grid stress score of 67.3 reflects residual system security complexity in SA, even as the energy price environment remains soft through the pre-dawn period.