Tasmania's electricity grid achieved 100% renewable penetration during the morning period of 25 April 2026, with hydro generation dominating the mix at between approximately 359 MW and 615 MW, supplemented by wind generation of around 36–40 MW. Gas OCGT units were entirely offline, reflecting the grid's complete reliance on renewable sources. Spot prices remained relatively stable and moderate, ranging from $88.14/MWh to $88.80/MWh across the observed intervals.
Tasmania's 100% renewable outcome is a common occurrence given the state's world-class hydro resource base, which provides dispatchable, controllable generation capable of meeting system demand without thermal backup. The gradual step-down in hydro output across intervals — from ~615 MW to ~359 MW — suggests hydro operators were actively managing reservoir releases, possibly responding to Basslink interconnector flows or moderating output as morning demand patterns shifted. Binding frequency regulation constraints (F_MAIN+RREG_0220 and F_T+LREG_0050/RREG_0050) with modest marginal values indicate the system was managing regulation requirements associated with the variable renewable mix, consistent with the operational complexity of maintaining frequency stability in a largely hydro-and-wind grid.
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.