Tasmania experienced high renewable penetration of 88.6% on 20 July 2026 at 20:00–20:30 UTC, with hydroelectric generation dominating at approximately 1,200–1,250 MW and supplementary wind output. Regional spot prices ranged between AUD 91–99.64/MWh across the five-minute settlement intervals, showing modest volatility in an otherwise stable evening period.
The high renewable penetration was driven by substantial hydroelectric output forming the generation base, supported by moderate wind generation totalling around 118–126 MW. Multiple binding constraints—particularly constraint F_TASCAP_RREG_0220 with a marginal value of AUD 5.49/MWh and constraint F_T+RREG_0050 with marginal values ranging from AUD 2.72–3.72/MWh—acted to support prices by restricting dispatch flexibility, preventing further price depression despite the renewable surplus.
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.