SA1 experienced sustained negative pricing at -$0.05/MWh across two consecutive intervals (14:00–14:05 on 15 June 2026), with prices oscillating near zero in the surrounding periods. The event was minor in severity with minimal price depression and brief duration.
High wind generation (1,473.59 MW) combined with low overall demand in SA1 created oversupply conditions during the negative pricing intervals. Binding constraints with non-zero marginal values—including F_T+LREG_0050 (marginal value $10.82/MWh) and F_MAIN+RREG_0220 (ranging $4.97–$7.79/MWh)—indicate that system constraints limited the ability to export excess generation, forcing the marginal price into negative territory to encourage demand response and reduce dispatch.
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.