Tasmania (TAS1) reached 100% renewable energy penetration on 19 May 2026, with hydro and wind generation totalling approximately 3,444 MW whilst all gas-fired generation remained offline. Regional reference prices remained stable at $96.18/MWh across the nine consecutive settlement intervals, indicating a well-balanced supply-demand situation despite the high renewable share.
The 100% renewable achievement was driven by substantial hydro generation (878–915 MW) from Tasmania's Hydro Tasmania assets, supplemented by moderate wind output (202–312 MW), which together met regional demand without requiring dispatchable gas capacity. The stable, moderate pricing and binding network constraints (primarily F_MAIN+RREG_0220 and F_T+RREG_0050 with marginal values of $7.64 and $5.63/MWh respectively) suggest that transmission limits rather than fuel scarcity or demand spikes were the active price-setting mechanisms, a typical pattern when renewable supply is abundant and interconnector flows are constrained.
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.