Tasmania experienced high renewable penetration of 89.2% during the 07:00–07:30 settlement window on 10 September 2026, driven by substantial hydro output (2,115 MW combined) and supplementary wind and rooftop solar generation. Real-time prices exhibited volatility, ranging from $35.38/MWh to $102.76/MWh, with notable spikes in the final two periods despite the high renewable share.
The binding constraint F_T+LREG_0050 carried the highest marginal value ($47.69/MWh), indicating that local regulation raise requirements were the primary price driver during this period, likely reflecting the system's need to manage rapid renewable variability and maintain frequency stability as hydro and wind output fluctuated. Multiple instances of constraint F_T+RREG_0050 binding with lower but persistent marginal values ($22.75–$15.22/MWh) suggest that regulation raise capacity constraints were active across multiple dispatch intervals, compounding upward pressure on prices despite abundant renewable supply and preventing full pass-through of the cost-benefit of high renewable penetration.
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.