Tasmania experienced high renewable penetration of 90.1% during the early morning period of 6 August 2026, driven predominantly by hydroelectric generation (1,043–1,391 MW) and supplemented by wind output. Regional spot prices remained elevated at AUD 83–88/MWh for most of the period before declining to AUD 68.66/MWh in the final settlement interval.
The sustained price levels of AUD 83–88/MWh despite high renewable generation reflect the binding constraint F_TASCAP_RREG_0220 operating with marginal values of AUD 4.95–7.79/MWh, which indicates a network or reserve constraint limiting the ability to utilise additional renewable generation and suppressing wholesale price competition. The price decline to AUD 68.66/MWh in the final interval corresponds with elevated hydroelectric output (1,391 MW), suggesting that either the constraint relaxed or dispatch economic conditions shifted to favour lower-cost generation entry.
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.