TAS1 experienced high renewable penetration at 89.8% during the 20:05–20:35 UTC period on 22 July 2026, with hydro and wind generation totalling approximately 2,716 MW. Real-time system prices (RRP) remained subdued at around 30–34 $/MWh until 20:25 UTC, then spiked to 46–49 $/MWh in the final two intervals.
The initial price stability despite very high renewable output reflects abundant supply from hydro and wind resources. The subsequent sharp price rise from 20:25 UTC onwards aligns with binding constraints carrying marginal values of 2.68–3.67 $/MWh, indicating that interconnection or regional dispatch limitations became active and began constraining supply, forcing marginal generation costs higher even as renewable supply remained elevated.
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.