Tasmania (TAS1) achieved 100% renewable energy penetration on 17 June 2026 between 20:05 and 20:30 UTC, with hydro generation around 850–888 MW and wind generation around 240–275 MW, while gas generation remained at zero. Regional reference electricity prices remained modest at 23–26 $/MWh during this period.
The high renewable penetration reflects strong hydro availability combined with moderate wind output, eliminating the need for thermal generation. Binding constraints F_MAIN+RREG_0220 and F_T+LREG_0050 held marginal values of 4.65–6.8 $/MWh and 3.633 $/MWh respectively, indicating that network or ancillary service constraints—rather than fuel costs—were the marginal price driver during these intervals.
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.