Winter evening demand ramps drove elevated prices across the NEM overnight, with South Australia the clear outlier at a 24-hour average of $326/MWh. Three interconnectors were binding at 06:30 AEST, producing sharp regional price spreads — SA sat above $500/MWh at that point while Victoria tracked near $167/MWh. Today's watch points: SA's gas-heavy morning profile as demand builds off its winter trough, ongoing interconnector binding in the afternoon peak window, and Tasmania's constraint activity following last night's T_BLINK_TV_NGZ event.
South Australia was the most active region in the past 24 hours. Prices spiked to $846/MWh across three intervals at 18:35 AEST, with gas-fired generation (OCGT and CCGT combined ~982 MW) forming the dominant supply mix during that window. Two further moderate spikes reached $500/MWh and $380/MWh at different points across the day, contributing to a 24-hour average of $326/MWh — the highest in the NEM by a significant margin. Separately, Tasmania recorded 100% renewable penetration between 20:05–20:40 UTC on hydro and wind, and a major binding constraint (T_BLINK_TV_NGZ, shadow price $7.308 million) drove TAS1 price volatility between $78 and $222/MWh across multiple settlement periods.
Western Australia's wholesale market was broadly contained across the 24-hour period, with a 24-hour average of $125/MWh. One moderate spike reached $253/MWh in the 21:35 interval on 22 June, up from a baseline near $213/MWh earlier in the evening. The escalation was short-lived, limited to a single trading interval