TAS1 experienced sustained negative pricing with a minimum of $-6.13/MWh occurring across 2 intervals on 12 July 2026, with prices recovering to near-zero levels immediately after. The region operated with high hydro and wind generation (approximately 1,400 MW combined) during the negative price window, alongside OCGT capacity.
Negative pricing in TAS1 reflects a supply-demand imbalance where generation exceeded consumption requirements, with binding constraints on raise regulation services (F_T+RREG_0050) and lower raise regulation (F_T+LREG_0050) each exhibiting material marginal values ($4.06 and $5.05 respectively). The combination of high renewable generation and active regulation service constraints indicates that marginal energy costs became negative as dispatch was constrained by system service requirements rather than demand, forcing generators to bid below zero to clear surplus supply.
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.