Tasmania achieved 100% renewable generation during the evening of 20 June 2026, with hydro output of approximately 1,080–1,095 MW and minimal wind contribution of 15–19 MW, whilst gas-fired generation remained offline. Regional reference prices remained relatively stable in the AUD $69.83–$70.24/MWh range across the six settlement intervals.
The high renewable penetration was driven by substantial hydro capacity meeting demand without recourse to thermal generation. Pricing stability despite 100% renewable mix suggests that binding constraints—particularly those with marginal values of AUD $4.97/MWh and AUD $3.45/MWh—were active in managing network flows or reserve requirements rather than reflecting fuel scarcity, indicating that network or service constraints rather than generation availability were the primary price drivers 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.