South Australia (SA1) experienced high renewable penetration of 88.0% on 27 June 2026 around midday, driven predominantly by wind generation of 1,346 MW complemented by battery output of 90.59 MW combined. Regional reference prices during this period ranged between $58.81/MWh and $82.18/MWh, reflecting volatile conditions typical of high-renewable intervals.
The elevated renewable penetration was supported by substantial wind generation, which provided the bulk of SA1's supply mix whilst thermal generation (gas CCGT and OCGT) played a reduced role at 286.15 MW combined. Binding constraint F_MAIN+RREG_0220 was active across all settlement intervals with marginal values declining from $16.87/MWh to $3.43/MWh, indicating this constraint was progressively less restrictive as the period progressed and likely contributed to the observed price volatility by limiting dispatch flexibility despite high renewable availability.
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.