SA1 experienced high renewable penetration at 86.1% during the early morning trading period of 29 May 2026, with wind generation comprising the dominant source at 1,066.79 MW, supported by solar output of approximately 178 MW combined. Regional Reference Energy Prices (RRPs) remained relatively stable in the $68–$70 range across the five-minute settlement intervals, reflecting the abundant renewable supply.
The high renewable penetration was primarily driven by strong wind generation conditions overnight, with wind supplying over 1,000 MW to the SA1 region during a period of typically lower demand. The binding constraint on the main transmission corridor (F_MAIN+RREG_0220) exhibited elevated marginal values ($10.60–$18.71/MWh), indicating localised network congestion that limited further renewable export and necessitated continued reliance on gas-fired generation (approximately 385 MW combined OCGT and CCGT) to manage system stability and meet regional demand, thereby capping downward price pressure despite the renewable surplus.
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.