Regional Outlook — SA1: Saturday 5 September 2026
South Australia's spot price sits at $60.09/MWh as of 20:30 AEST, up sharply from the negative pricing that dominated overnight trade. Prices ran from -$16/MWh through the early hours (00:00-05:00) as low demand of 400-700 MW combined with wind and solar output pushed the region into negative territory, before climbing through the morning as demand rebounded above 1,600 MW and solar generation tapered into the evening. The 19:00-20:30 window has seen sustained prices in the $59-74/MWh band, peaking at $74.44/MWh at 19:45, consistent with the evening demand ramp as rooftop and grid solar drop off.
Generation mix at the current interval is battery-led: batteries are contributing 436 MW, the largest single source, followed by wind at 146 MW and gas CCGT at 61 MW. Gas OCGT is negligible at 0.11 MW and solar has dropped to zero with the sun down. This reflects SA's evening pattern where battery storage discharges to cover the solar shortfall while wind provides the baseload renewable contribution. Renewable penetration sits at 90.43%, easing from a peak above 96% around midday when solar was near its maximum, but still historically high for an evening period. Carbon intensity is 0.0469 tCO2/MWh, up from lows of 0.015 tCO2/MWh at midday but still well below the 0.03-0.04 tCO2/MWh typical of higher-demand periods.
Predispatch forecasts point to a volatile day ahead. Prices are expected to ease toward $0-11/MWh through the 23:00-02:00 window as demand falls away overnight, with some intervals forecast to turn negative again near 01:00-02:30 AEST. The key development is a sharp price escalation forecast from 07:00 AEST tomorrow, climbing from $74/MWh to above $100/MWh by 08:00, and peaking near $126/MWh around midday (12:00 AEST) before easing back to the mid-$70s/MWh by late afternoon. This trajectory aligns with the AEMO voltage intervention notice flagging a foreseeable requirement from 11:00 AEST tomorrow — traders should watch for a formal direction if market response is insufficient by 15:00 today.
Active market notices are relevant for risk assessment: AEMO cancelled its SA intervention event at 20:00 today (Notice 145068) after the AGL Torrens Island direction was progressively extended through the afternoon, and the Para-Templers West/Magill-Torrens Island A 275kV line contingency reclassification was cancelled at 18:00 as the severe weather warning passed. However, a fresh foreseeable intervention notice (145053) flags voltage-related risk in SA from 11:00 AEST tomorrow, directly overlapping with the forecast price spike to $126/MWh — this is the standout item for tomorrow's session. Separately, an unplanned outage on the Keith-Kincraig 132kV line has invoked the S-KHKN constraint set affecting Victoria-SA interconnector flows, worth monitoring for any impact on import/export capacity during the price ramp.