Tasmania's grid achieved 100% renewable penetration during the early hours of 5 April 2026 (AEST), with generation supplied entirely by a combination of wind and hydro resources. Total wind output ranged between approximately 137 MW and 159 MW across the period, complemented by hydro generation that peaked at over 333 MW. Spot prices remained relatively moderate, ranging from around $73.76/MWh to $88.12/MWh, consistent with a low-demand overnight period.
Tasmania's 100% renewable outcome is a common occurrence given the state's predominantly hydro-based fleet and strong wind resource, with no gas-fired generation required during this low-demand overnight window. The elevated hydro dispatch — particularly the spike to 333 MW — suggests hydro operators were actively balancing wind variability and potentially responding to Basslink flow dynamics or water storage management objectives. The binding frequency regulation constraints (F_T+LREG_0050 and F_T+RREG_0050) with modest marginal values indicate that maintaining system frequency was a consideration, likely reflecting the challenge of managing grid stability with a high proportion of asynchronous wind generation and no synchronous gas generation online.
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.