Tasmania achieved 100% renewable penetration during the 06:05–06:30 UTC period on 20 August 2026, with hydro and wind generation totalling approximately 1,230–1,450 MW across multiple snapshots. Prices ranged from $36.21–$54.95/MWh, with a spike to $54.95/MWh at 06:20 UTC followed by moderation.
The price spike at 06:20 UTC occurred despite high renewable supply, suggesting constraint-driven pricing rather than scarcity. Multiple binding constraints with material marginal values (ranging from $7.45–$8.40/MWh) were active during this period, indicating that network or operational limits rather than generation shortfall were the primary price drivers. The rapid price recovery to lower levels immediately after suggests the constraint activation was transient and unrelated to underlying demand–supply imbalance.
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.