Tasmania experienced 100% renewable energy penetration on 21 August 2026 during the early morning period, with hydroelectric and wind generation meeting all demand. Regional reference prices rose from $36.19/MWh to a peak of $60.16/MWh across the five-minute settlement intervals, despite the absence of thermal generation.
The price escalation during high renewable penetration was driven by binding constraint F_TASCAP_RREG_0220, which carried marginal values ranging from $5.98/MWh to $7.71/MWh across the settlement period. This constraint's consistent binding status indicates that network or reserve requirement limitations—rather than generation scarcity—were the primary price drivers, compressing the feasible dispatch space despite abundant renewable supply and constraining the region's ability to export excess generation or meet ancillary service requirements.
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.