Tasmania (TAS1) achieved 100% renewable energy penetration during the evening of 29 May 2026, with hydroelectric generation totalling approximately 2,019 MW and wind generation around 519 MW, completely displacing fossil fuel generation. Spot prices remained relatively stable in the $87–$92/MWh range during this period, reflecting the low marginal cost of renewable generation.
The 100% renewable penetration was driven by strong hydroelectric output from Tasmania's Hydro Tasmania assets combined with moderate wind generation, which together satisfied total demand without requiring any gas-fired OCGT generation. The binding network constraints (F_T+RREG_0050 and F_TASCAP_RREG_0220) with low marginal values suggest transmission capacity rather than fuel availability was the limiting factor, indicating Tasmania's renewable capacity was sufficient to meet demand while respecting system security requirements.
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.