Tasmania's TAS1 region achieved 100% renewable penetration during the early morning period of 10 April 2026, with generation supplied entirely by a combination of wind (approximately 278–281 MW) and hydro (approximately 235–273 MW). Wholesale prices remained stable and modest at $20.10/MWh across all observed dispatch intervals, reflecting the low marginal cost of the renewable generation mix. No gas-fired OCGT generation was dispatched during this period.
Tasmania's 100% renewable outcome is structurally common given the region's significant hydro storage capacity and strong wind resource, with hydro providing flexible despatchable backing to complement variable wind output — particularly during low-demand overnight and early morning periods. The consistently flat price of $20.10/MWh suggests the market clearing price was being set by the marginal cost of hydro or wind generation, with no thermal plant required to meet demand. The binding constraint F_MAIN+RREG_0220, related to mainland raise regulation FCAS, carried a declining marginal value across the period, indicating that interconnector flows or frequency regulation obligations to the mainland may have been influencing dispatch at the margin, though not to a degree sufficient to disrupt the all-renewable generation profile.
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.