Tasmania experienced very high renewable penetration of 96.4% on 10 June 2026 at 20:00–20:40 AEST, driven by substantial hydro generation (1101–1448 MW) and modest wind output (95–103 MW), with minimal gas-fired capacity required. Regional reference prices exhibited volatility, ranging from $97.04 to $153.51/MWh, with a notable spike to $153.51/MWh at 20:30.
The high renewable penetration reflects Tasmania's hydro-dominated generation stack operating at elevated output during the period. Price volatility appears linked to binding constraints, particularly constraint F_T+RREG_0050 which carried the highest marginal value of $42.79/MWh, suggesting localised congestion or ramping limitations created price spikes despite abundant renewable supply. The alternating pattern of elevated and subdued pricing within minutes indicates constraint-driven dispatch adjustments rather than wholesale market scarcity.
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.