Tasmania achieved 100% renewable energy penetration on 18 June 2026 between 20:00 and 20:40 UTC, with hydro and wind generation totalling approximately 1,228–2,009 MW across recorded snapshots and no gas-fired generation online. Real-time prices rose sharply from $4.18/MWh to $29.29/MWh during this period, indicating tightening system conditions despite high renewable availability.
The price elevation despite 100% renewable penetration suggests the high renewable supply was constrained by binding network or operational limits rather than driven by scarcity. Multiple binding constraints with material marginal values—particularly F_MAIN+RREG_0220 ($7.62/MWh) and F_MAIN+LREG_0210 ($4.16/MWh)—indicate that regulation services or network congestion limits were preventing fuller utilisation of available renewable generation, forcing the market price upward to clear demand within those operational boundaries.
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.