Tasmania experienced high renewable penetration of 89.9% during the evening of 1 August 2026, with combined hydro and wind generation totalling approximately 1,109–1,378 MW across the settlement period. Regional reference prices (RRP) remained at historically low levels (0.1–0.18 $/MWh) throughout the event, reflecting the substantial renewable energy supply.
The depressed pricing observed in TAS1 is consistent with the high proportion of zero-marginal-cost renewable generation displacing higher-cost dispatchable plant. The presence of multiple binding constraints with marginal values in the range of 2.8–3.0 $/MWh indicates that network or system security limits—rather than energy scarcity—were the binding constraint on further dispatch, typical when renewable output is high relative to system load and interconnector capacity. The shallow price response suggests that once renewable supply reached this level, incremental dispatch was constrained by physical or security limits rather than fuel costs.
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.