Tasmania experienced high renewable penetration of 85.3% on 18 August 2026, driven by substantial hydro and wind generation totalling approximately 1,696 MW. Prices showed significant volatility during the early morning settlement period, ranging from $8.91/MWh to $35.14/MWh, with multiple binding constraints active on the network.
The high renewable penetration reflects substantial hydro output (approximately 1,163 MW across multiple readings) and wind generation (approximately 532 MW), which collectively displaced gas-fired generation to roughly 125 MW. The recurring binding constraint F_TASCAP_RREG_0220 with marginal values between $9.96/MWh and $18.55/MWh, along with constraint F_T+LREG_0050 at $28.41/MWh, indicates network limitations were restricting renewable dispatch during the period, explaining the price volatility and preventing further penetration despite abundant renewable availability.
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.