South Australia (SA1) experienced very high renewable penetration of 95.3% during the 12:00–12:30 period on 2 July 2026, driven predominantly by wind generation of 1,690.53 MW with minimal conventional generation. Regional reference prices oscillated between negative and low positive values, reflecting oversupply conditions typical of high renewable generation intervals.
The high renewable penetration and volatile pricing are consistent with strong wind output during the settlement period. Multiple binding constraints with marginal values in the range of 4.97–7.25 $/MWh indicate that transmission or system operation limits were active; these constraints supported price floors during periods of negative pricing, preventing prices from falling further despite substantial renewable supply. Battery storage remained deployed at 34.19 MW, likely providing system support during the volatile price movements.
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.