Tasmania achieved 87.3% renewable energy penetration during the 06:35–07:00 UTC period on 7 September 2026, driven by combined hydro (2,286.6 MW) and wind (387.2 MW) generation. Despite high renewable supply, TAS1 region prices rose sharply from $41.21/MWh to $101.29/MWh across the six settlement periods.
The steep price rise reflects binding constraints that increasingly restricted dispatch flexibility as the period progressed, with multiple constraint equations (F_MAIN+RREG_0220, F_T+NIL_ML_L6, F_MAIN+LREG_0210, and F_TASCAP_RREG_0220) active and marginal values peaking at $16.88/MWh. The combination of high renewable output and active binding constraints suggests that while renewable generation was abundant, regional or interconnection constraints progressively limited supply scheduling capability, forcing additional dispatch from higher-cost marginal generation (gas OCGT at 179.64–124.89 MW) to meet demand, thereby driving prices upward despite renewable dominance.
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.