Tasmania experienced sustained negative pricing over an 8-interval period from 00:20 to 00:55 on 2 August 2026, with prices reaching a minimum of −$9.94/MWh. The region's generation mix comprised approximately 1457 MW of hydro, 685 MW of wind, and 250 MW of gas OCGT capacity during this window.
The negative pricing was driven by a binding constraint (F_TASCAP_RREG_0220) with marginal values ranging from $4.68 to $6.81/MWh, indicating physical limitations on network or system capabilities that forced generation curtailment despite low demand. The combination of high renewable generation (wind and hydro contributing over 60% of the region's output) with binding constraint pressure created an oversupply condition that necessitated negative pricing to incentivise load absorption and discourage further generation dispatch.
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.