Tasmania achieved 100% renewable electricity generation during the evening of 27 June 2026, with hydro and wind resources supplying all demand across six consecutive five-minute settlement periods. Regional reference prices remained stable at $70.22/MWh throughout the high renewable penetration event.
The sustained 100% renewable generation reflects strong hydroelectric output (averaging ~969 MW) supplemented by moderate wind generation (averaging ~117 MW), with no requirement for thermal plant operation. Two binding constraints with declining marginal values—F_MAIN+RREG_0220 (ranging from $7.98 to $3.31/MWh) and F_MAIN+LREG_0210 ($3.01/MWh)—indicate that network or operational constraints rather than energy scarcity drove price formation during this period.
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.