Tasmania experienced high renewable penetration of 90.0% on 21 September 2026 during the 07:00–07:30 settlement window, with hydro and wind generation combining to supply approximately 2,794 MW of the region's output. Regional reference prices (RRP) exhibited considerable volatility during this period, rising from $40.67/MWh to a peak of $106.78/MWh, suggesting binding transmission or system security constraints despite the high renewable generation.
The rapid price escalation during high renewable penetration indicates that binding constraints—particularly F_T+NIL_MRWF_TG_R6 (marginal value $28.56), F_T+RREG_0050 (marginal values $21.10 and $16.08), and F_T_NIL_MINP_R6 (marginal value $20.02)—were restricting the dispatch of low-cost renewable energy, forcing more expensive dispatchable generation (gas OCGT ~125 MW) into service. The presence of multiple binding constraints with substantial marginal values indicates network congestion or stability-related limitations limiting the export or efficient utilisation of the abundant hydro and wind resources, thereby creating locational scarcity pricing that compressed renewable generation's economic benefit.
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.