Winter solstice Sunday brought elevated volatility across the NEM, with SA1 the clear outlier — averaging $623/MWh over 24 hours and touching $20,300/MWh intraday. AEMO has active price reviews under Clause 3.9.2B and Manifestly Incorrect Inputs provisions covering SA1 (06:15–07:00 AEST) and QLD1 (06:15–06:35 AEST), so confirmed prices for those windows may shift. NSW1 and VIC1 both averaged $95/MWh with demand climbing sharply through the Monday morning peak ramp — watch VIC1 as load tracks toward winter peak levels with renewables at a thin share of dispatch this morning.
SA1 is the standout. A $2,971/MWh spread between SA1 ($3,130/MWh) and VIC1 ($159/MWh) at the 06:00 AEST snapshot directly signals constrained import capacity across both SA interconnectors. Earlier in the day, SA1 posted multiple price spike events — $845/MWh around 13:40 AEST and $418/MWh at 19:25 AEST — with sharp oscillations between spikes suggesting rapid changes in dispatch conditions rather than sustained scarcity. TAS1 also drew attention: a binding constraint T_BLINK_TV_NGZ carried a shadow price of $7.31 million/MWh during the 14:00–14:25 window, an exceptional severity level, though regional spot prices remained relatively contained at $71–$79/MWh during that period. Tasmania also recorded 100% renewable generation during 20:05–20:30, with hydro and wind supplying all output.
WA1 averaged $172/MWh over the 24-hour period, reaching a peak of $389/MWh. Two discrete price spikes were recorded: a 34% jump to $269/MWh at 06:10 during the early morning demand peak, and a sharper 51% spike to $372/MWh at 20:40 — the latter occurring with wind, gas, and battery dispatch already elevated. Neither spike extended beyond a single trading interval