Tasmania's grid achieved 100% renewable penetration during the early morning period of 13 April 2026, with generation supplied entirely by hydro (approximately 383–444 MW) and wind (approximately 175–197 MW) resources, and gas OCGT units offline. Spot prices remained moderate, ranging between roughly $68 and $86 per MWh, suggesting balanced supply and demand conditions without significant price stress. This is a relatively routine occurrence for Tasmania given its predominantly hydro-based generation fleet.
Tasmania's high proportion of dispatchable hydro capacity, complemented by wind generation, makes 100% renewable operation a common outcome — particularly during off-peak early morning periods when demand is lower and gas peakers are not required. The binding frequency regulation constraints (F_MAIN++RREG_0220 and F_TASCAP_RREG_0220) with marginal values between $6 and $10 suggest that regulation raise services are the primary system security consideration, likely reflecting the need to maintain frequency stability on the island system and across the Basslink interconnector with Victoria. Price variability in the observed dispatch intervals is consistent with hydro dispatch adjustments and interconnector flows responding to mainland NEM conditions rather than any supply shortfall.
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.