TAS1 experienced high renewable penetration of 90.63% on 22 September 2026 at 07:30 UTC, driven predominantly by hydro generation (2,469 MW combined) with minor wind and rooftop PV contributions. Regional spot prices rose sharply from $56.42/MWh to $105.31/MWh over the 25-minute period, indicating tightening supply-demand balance despite the high renewable output.
The steep price escalation reflects binding constraints with marginal values indicating physical transmission or system limits were active during the period. The highest-value binding constraint (F_T+NIL_MG_R6 at $14.93/MWh) and multiple regional constraint breaches (F_T+RREG_0050, F_MAIN+RREG_0220, F_TASCAP_RREG_0220) suggest that despite abundant renewable generation, network limitations restricted supply delivery or export capability, forcing reliance on higher-cost gas generation (124–125 MW OCGT) to meet local demand and driving prices upward.
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.