Tasmania achieved 100% renewable energy penetration on 22 August 2026, with hydro and wind generation totalling approximately 2,062 MW across the settlement period. Despite high renewable supply, spot prices rose sharply from $24.09/MWh to $75.90/MWh over the five-minute intervals, indicating tightening system conditions rather than oversupply.
The price trajectory reflects binding constraints becoming progressively more restrictive, with constraint F_T+LREG_0050 exhibiting the highest marginal value at $55.00/MWh, suggesting physical network or service capability limits were the primary price drivers. The presence of multiple binding constraints with non-trivial marginal values indicates that system security or network capacity requirements—rather than fuel cost competition—constrained dispatch and elevated spot prices despite abundant renewable generation.
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.