Tasmania's electricity system reached 100% renewable generation on 3 June 2026 at approximately 20:25 AEST, with hydroelectric output totalling approximately 2,680 MW and wind generation around 260 MW combined. Regional Reference Price remained relatively stable in the $80–87/MWh range throughout the period, indicating manageable supply-demand balance despite the extreme renewable penetration.
The 100% renewable outcome reflects Tasmania's abundant hydroelectric resources and moderate wind generation during this evening settlement period, with no requirement for conventional thermal generation (GAS_OCGT at 0 MW). The presence of multiple binding transmission constraints—particularly F_MAIN+RREG_0220, F_S+TBTU_R1, and F_T+RREG_0050 with marginal values of $4–5/MWh—suggests network congestion rather than supply scarcity as the marginal constraint, indicating that renewable output could have been higher but was limited by interconnector or local transmission capacity, which contributed to the modest price movements observed.
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.