TAS1 experienced sustained negative pricing over a 30-minute window on 12 July 2026, with prices ranging from −$6.75/MWh to −$7.41/MWh across seven consecutive intervals. Wind generation dominated the region's output at approximately 528 MW, with combined hydro and gas generation totalling around 467 MW.
The negative pricing reflects an oversupply condition driven by high renewable generation (wind at ~528 MW representing a substantial share of the region's 1,193 MW total output) during a low-demand period. Multiple binding constraints with positive marginal values—including constraint F_TASCAP_RREG_0220 at $4.50/MWh and constraint F_T+RREG_0050 at $3.07/MWh—indicate dispatch restrictions that prevented adequate load absorption or export of excess generation, forcing the price mechanism into negative territory to incentivise consumption or generation withdrawal.
Causal analysis generated by gridIQ's synthesis model from live AEMO market data: dispatch prices, generation mix, interconnector flows and market notices in the interval surrounding the event.