Tasmania experienced 100% renewable generation on 2 September 2026 at 06:35–06:55 UTC, with hydro and wind together meeting all demand. Despite high renewable penetration, real system prices rose sharply from ~$25/MWh to $75/MWh within 10 minutes, indicating constraint-driven scarcity.
The price spike reflects binding constraints with material marginal values, particularly a constraint with $7.79/MWh shadow price and two others ranging from $4.97–$5.27/MWh. These constraint bindings, rather than fuel scarcity or generation insufficiency, drove the majority of the price uplift, suggesting physical network or regional frequency regulation limitations were active despite abundant renewable supply.
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.