SA1 experienced sustained negative pricing at approximately $-3/MWh across three consecutive intervals during the early morning of 9 June 2026. The event occurred within a generation environment dominated by wind (1523.73 MW) and solar (approximately 176 MW), with minimal dispatchable generation.
The negative pricing reflects an oversupply of variable renewable generation relative to regional demand during off-peak hours. The binding constraint F_T+RREG_0050 with marginal values of $3.76–$3.79/MWh indicates that a specific system constraint was active in pricing the market; the constraint's positive shadow price suggests it was limiting dispatch or flow, forcing renewable generators to accept negative prices to remain connected to the network.
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.