Tasmania achieved 100% renewable generation on 26 June 2026 between 20:05 and 20:25 UTC, with hydro output dominating at approximately 1,140–1,206 MW and negligible wind contribution. Regional reference prices remained stable in the range of $79.12–$79.18/MWh despite the high renewable penetration.
The stable pricing despite 100% renewable generation suggests that the dispatch was managed within available network capacity. The binding constraint F_MAIN+RREG_0220 was active across all settlement intervals with declining marginal values (4.69, 3.46, 3.45, 3.43 $/MWh), indicating this constraint was progressively less tight as the period progressed. The secondary binding constraint F_T+NIL_ML_RECL_L6 (marginal value $3.00/MWh) further indicates that network or operational limits rather than fuel cost were the limiting factors on price formation during this high-renewable period.
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.