Tasmania experienced very high renewable penetration of 98.24% during the evening of 9 July 2026, with hydroelectric generation dominating at approximately 1,500–1,600 MW and wind contributing 73–78 MW. Regional reference prices rose steadily from $102.71/MWh to $121.06/MWh over the 25-minute period, an increase of approximately 18%.
The price rise occurred despite—and likely because of—the high renewable generation mix. A binding constraint (F_T+RREG_0050) with a consistent marginal value of $4.06/MWh indicates that system security or operational limits were actively constraining dispatch, reducing available generation capacity and forcing marginal supply from more expensive sources. With very high hydro output, the constraint binding suggests transmission or regional security limits were the primary driver of elevated pricing rather than fuel scarcity.
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.