SA1 experienced high renewable penetration of 86.9% during the early morning of 10 September 2026, driven predominantly by wind generation of 560.56 MW. Regional reference prices fell to the floor of −$100/MWh across five consecutive 5-minute intervals, indicating severe over-supply conditions typical of high renewable periods.
The sustained negative pricing reflects excess renewable generation relative to regional demand, with wind contributing over 85% of the generation mix. Multiple binding constraints with marginal values ranging from 4.2 to 5.98 indicate that network limitations rather than energy balance alone are constraining the dispatch, forcing generators to accept negative prices as the market clears against these physical restrictions.
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.