Tasmania's electricity grid reached 100% renewable penetration during the 07:00–07:25 AEST window on 22 April 2026, driven entirely by hydro and wind generation with no gas-fired output online. Spot prices remained stable and relatively modest, hovering around $87/MWh throughout the period, indicating the grid was comfortably managing the fully renewable supply. Rooftop PV contributed a minor but meaningful share alongside utility-scale wind and hydro assets.
Tasmania's structural reliance on hydro power — which provided the bulk of generation at roughly 1,000 MW in aggregate — combined with favourable wind conditions across multiple wind farms, was sufficient to meet regional demand without any thermal backing. The binding constraint 'F_MAIN+RREG_0220' (raise regulation FCAS on the mainland interconnector) carried a positive marginal value throughout the period, suggesting that FCAS obligations associated with the Basslink interconnector were influencing dispatch at the margin, though not enough to trigger gas generation. The stable and slightly elevated price of ~$87/MWh likely reflects the cost of providing frequency regulation services and interconnector constraints rather than any scarcity in energy supply itself.
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.