Tasmania's electricity grid achieved 100% renewable penetration during the early hours of 3 April 2026, with generation supplied entirely by hydro (approximately 223–367 MW) and wind (approximately 69–85 MW) across the observed dispatch intervals. Gas-fired open cycle generation contributed nothing during this period, reflecting Tasmania's strong endowment of dispatchable renewable resources. Spot prices remained relatively stable and moderate, ranging between approximately $50 and $56/MWh, suggesting supply and demand were well balanced.
Tasmania's near-complete reliance on hydroelectric generation as its primary dispatchable resource, supplemented by wind, makes 100% renewable outcomes a routine occurrence, particularly during overnight low-demand periods when thermal plant is not required. The binding constraint F_MAIN++RREG_0220 — related to raise regulation frequency control ancillary services on the mainland interconnector — carrying marginal values between ~$7.50 and ~$10 suggests that inter-regional flows via Basslink and associated frequency regulation obligations were influencing dispatch to some degree. The modest price uplift to $56.30/MWh in one interval likely reflects these network constraint costs rather than any fundamental supply tightness.
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.