Tasmania (TAS1) experienced 100% renewable energy penetration during the evening of 25 June 2026, with hydroelectric generation dominating supply at approximately 1,024–1,127 MW complemented by wind generation of 52–118 MW. Regional reference prices (RRP) remained stable in the range of $70–72/MWh across the period, indicating a well-managed dispatch despite the high renewable contribution.
The high renewable penetration was driven by sustained hydroelectric output from Tasmania's hydro fleet, which consistently supplied over 930 MW throughout the period, supported by moderate wind generation. The stable pricing and binding constraints with marginal values of $5.73–$6.75/MWh suggest that system constraints rather than energy scarcity were limiting factors; specifically, binding constraints F_MAIN+RREG_0220, F_Q++8C_L6, and F_Q++8C_L60 indicate that network or regional security limits were actively constraining dispatch rather than any shortage of renewable supply.
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.