Tasmania achieved 100% renewable energy penetration during the evening of 28 May 2026, with hydroelectric generation supplying approximately 3,315 MW across the region whilst gas-fired generation remained offline. Prices remained relatively stable in the $87–$98/MWh range during this period, with the constraint F_T+NIL_MG_R6 binding with marginal values between $9–$21/MWh, indicating some transmission or network limitations.
The 100% renewable outcome was driven by abundant hydroelectric availability in Tasmania, which historically provides baseload renewable capacity and can be dispatched flexibly to meet demand. The binding transmission constraints (particularly F_T+NIL_MG_R6) suggest that despite high renewable supply, network limits prevented further cost reduction, with dispatch being constrained by physical limitations rather than generation availability. The absence of gas-fired generation and minimal wind contribution indicates that hydro alone was sufficient to meet evening demand, typical of off-peak periods when load is lower and stored water resources in Tasmanian catchments remain sufficient.
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.