Tasmania experienced high renewable penetration of 89.85% during the early morning of 29 August 2026, driven by strong combined hydro and wind generation totalling approximately 1,579 MW. Regional reference prices ranged from $11.92/MWh to $44.16/MWh across the five-minute settlement intervals, with moderate volatility despite the high renewable contribution.
The elevated renewable generation mix, comprising hydro and wind sources, naturally supported low wholesale prices in the early morning period; however, several binding constraints with substantial marginal values indicate that network limitations rather than fuel costs were the primary price drivers. The constraint F_T+LREG_0050 (marginal value $16.99/MWh) and F_T+NIL_ML_L6 (marginal value $16.53/MWh) exerted the largest upward pressure on prices, suggesting that transmission or reserve regulation requirements were restricting the ability to fully utilise the available renewable capacity and forcing reliance on more expensive generation sources.
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.