Tasmania achieved high renewable penetration of 85.6% during the evening settlement period of 17 July 2026, with hydro and wind generation totalling approximately 1,235–1,514 MW across the recorded intervals. Prices rose steadily from $90.96/MWh to $99.73/MWh during this period, reflecting tightening supply conditions despite the high renewable output.
The binding constraint F_TASCAP_RREG_0220 with marginal values of $4.98–$5.48/MWh was active throughout the period, indicating that constraint-driven limitations on available generation capacity were the primary driver of the price rise. The high renewable generation mix, whilst supplying the majority of demand, was insufficient to overcome the constraint's binding effect, suggesting that network or regulatory restrictions rather than fuel scarcity were the operative constraint on the market price.
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.