Tasmania experienced high renewable penetration of 85.6% on 5 August 2026 during the early morning period, driven by substantial hydroelectric generation (1,204–1,290 MW) and modest wind output (25–33 MW). Regional reference prices remained relatively stable in the $89–$100/MWh range across the seven consecutive five-minute intervals, with a minor dip to $89.38/MWh at 00:30.
The high renewable penetration reflects Tasmania's continued reliance on hydroelectric supply, which dominated the generation mix at over 75% of total output, with gas OCGT providing the remaining dispatchable capacity (~200–265 MW). Multiple binding constraints with modest marginal values ($4–$5/MWh) indicate that system security limits rather than fuel cost competition were marginally constraining dispatch during this period, consistent with the stable, mid-range pricing observed.
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.