Tasmania experienced 100% renewable energy penetration during the early morning period of 4 September 2026, with hydro and wind generation totalling approximately 1,300–1,400 MW across multiple dispatch intervals. Spot prices rose from $11.04/MWh at 06:35 to approximately $33–34/MWh by 06:45, then stabilised in that range through 07:00.
The price increase from low to moderate levels despite 100% renewable generation indicates that supply-side factors alone did not determine outcomes. The consistent binding constraint F_T+RREG_0050 with a marginal value of $5.41 across all intervals suggests operational limits were active and contributing to price formation, with this constraint accounting for approximately one-sixth of the observed price level in the later intervals. The rising prices during high renewable generation reflect either increased system demand, transmission limitations captured by the binding constraint, or regulatory requirements that restricted the ability to fully utilise available renewable output.
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.