Sunday night into Monday morning was defined by sustained low and negative pricing across SA1 and VIC1 — SA1 spent more than 15 consecutive hours at sub-zero or near-zero spot prices, touching −$2/MWh across multiple intervals, while VIC1 saw brief negative prints around 11:00–11:20 AEST with wind output exceeding 3,700 MW. QLD1 ran the other direction, averaging $93/MWh for the day with a 24-hour max of $232/MWh as its evening ramp pushed demand to around 6,841 MW by 06:30 AEST. Watch QLD1 and TAS1 this morning — both are carrying elevated spot prices heading into the working week, and the Basslink constraint event from yesterday has left TAS1 with a $84/MWh average to digest.
Tasmania was the standout region over the past 24 hours for two contrasting reasons. First, a major binding constraint on the Basslink interconnector (T_BLINK_TV_NGZ) triggered a shadow price of $7.308 million, driving TAS1 spot to $190.21/MWh before easing sharply to $87.20/MWh once relieved — illustrating how interconnector limits can rapidly reprice an otherwise well-supplied region. Second, and separately, TAS1 achieved 100% renewable penetration during the 20:05–20:30 UTC window, with hydro running at approximately 812–1,114 MW and wind contributing 198–213 MW, with no thermal generation dispatched. Spot remained stable at ~$79.90–$79.95/MWh during that window.
WA1 recorded the highest 24-hour average spot price of all six regions at $108/MWh, with an intraday maximum of $245/MWh — the highest single-interval peak across the market for the reporting period. No L