Tasmania's electricity grid achieved 100% renewable generation during the early hours of 28 March 2026, driven entirely by hydro and wind resources with no gas OCGT output recorded. Hydro dominated the generation mix at approximately 382–387 MW, supplemented by wind contributing around 53–63 MW across the observed intervals. Spot prices eased from $88.56/MWh to $72.24/MWh over the period, reflecting a modest but stable pricing environment consistent with overnight low-demand conditions.
Tasmania's 100% renewable outcome is consistent with the region's structurally renewable generation fleet, which relies predominantly on hydro storage and wind, with gas peakers held in reserve for periods of high demand or supply stress. The overnight timing of this event (UTC midnight, corresponding to approximately 10–11am AEDT) and moderate price levels suggest demand was comfortably met by available hydro dispatch and favourable wind conditions, rendering gas generation economically unnecessary. The repeatedly binding constraint 'F_I+RREG_0220' with declining marginal values indicates that Basslink interconnector regulation raise requirements were active, suggesting some reliance on the interconnector for system security services even during this period of strong local renewable output.
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.