Tasmania experienced high renewable penetration of 88.1% on 15 August 2026 during the early morning period, driven primarily by substantial hydroelectric generation (903–807 MW across multiple units) with minimal wind contribution (20–28 MW). Regional reference prices rose from $50.16/MWh to a peak of $70.20/MWh across the settlement intervals, despite the high renewable share.
The price elevation occurred despite high renewable penetration because binding constraints with material marginal values ($14.40, $7.79, $5.97 and $5.54/MWh) restricted available generation capacity, preventing renewable output from fully meeting demand at zero or very low cost. The sustained reliance on gas OCGT generation (124 MW) alongside hydro suggests that network or transfer constraints limited the ability to fully utilise Tasmania's renewable capacity, forcing marginal generation from higher-cost sources to be dispatched to clear the market.
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.