Tasmania experienced a critical binding constraint event on the Blinking Billy to Tasmanian Valley transmission corridor (T_BLINK_TV_NGZ) with an exceptionally high shadow price of $7.31 million, indicating severe network congestion. Regional electricity prices ranged between $97–106/MWh during the event window (22:55–23:30 on 28 May 2026), reflecting the transmission limitation's impact on dispatch costs.
The constraint binding was driven by high hydro generation output (approximately 1,360–1,570 MW across Tasmania's hydro fleet) competing against limited transmission capacity on the Blinking Billy corridor, forcing expensive local redispatch or generation constraints. The absence of gas-fired generation (0 MW OCGT) and negligible wind contribution (~11–12 MW) left hydro as the sole reliable supply source, creating a bottleneck when generation levels exceeded the corridor's capability, resulting in the extraordinarily high marginal value as the market sought to relieve the constraint through price signals.
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.