Tasmania experienced high renewable penetration of 91.8% during the 20:05–20:30 period on 31 July 2026, driven primarily by hydro generation (~1,236 MW average) and supplemented by wind (~130 MW). Over this six-interval window, regional reference prices (RRP) rose from $74.67/MWh to $92.07/MWh, a 23% increase.
The price rise is consistent with binding constraints on Tasmania's network, with multiple constraint equations (F_TASCAP_RREG_0220 and F_T+RREG_0050) active and marginal values ranging from $3.92–$5.56/MWh, indicating transmission or reserve requirement limits were restricting supply. Although renewable generation was abundant, the binding constraints prevented full dispatch of available capacity, tightening the effective supply envelope and raising marginal cost.
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.