A major binding constraint (T_BLINK_TV_NGZ) with an exceptionally high shadow price of $8.352 million was active in TAS1 on 1 September 2026 at 08:00–08:25 UTC, coinciding with modest RRP volatility in the $30–$53 range. The constraint was binding alongside a secondary constraint (F_T+NIL_MRWF_TG_R6) with marginal values in the $71–$105 range, indicating tight system conditions.
The extremely high marginal value of the primary binding constraint ($8.352 million) suggests severe physical limitations were preventing further dispatch relief during a period when TAS1 was generating substantial hydro (approximately 608–779 MW) and wind (450–492 MW) output, leaving limited flexible capacity. The concurrent binding of the secondary constraint with elevated but lower marginal values ($71–$105) indicates that multiple transmission or operational limits were simultaneously restrictive, compounding scarcity economics and preventing dispatch adjustments that would otherwise moderate spot prices.
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.