Sunday delivered a broadly orderly NEM, with overnight demand troughs giving way to a steady winter morning ramp across all mainland regions. NSW1 averaged $74/MWh (max $111/MWh), QLD1 $61/MWh (max $102/MWh), and VIC1 a softer $55/MWh (max $94/MWh). SA1 was the standout on the low side, averaging just $41/MWh with two separate bouts of negative pricing during overnight and early-morning intervals. Tasmania ran quietly in a narrow $60–$77/MWh band all day. As Monday's demand build gets underway, watch the morning ramp in VIC1 and QLD1 — both were already tracking sharply higher by 06:30 AEST.
Tasmania hit 99.3% renewable penetration during the evening settlement period — hydro contributing approximately 1,078–1,156 MW and wind a further 73–96 MW. Notably, prices remained anchored in the $70–$71/MWh range throughout, indicating the market cleared in an orderly fashion at that penetration level. SA1 also recorded 85.5% renewable penetration at its peak, though that came with more volatile pricing: wind reached 1,177 MW and the region printed negative prices of –$2/MWh across four intervals in two separate windows during low-demand overnight hours.
Western Australia was far from quiet. WA1 averaged $195/MWh across the day — well above NEM equivalents — with a daily max of $386/MWh. Three discrete price spike events were recorded: a major five-interval spike peaking at $386/MWh between 12:10 and 12:30, a single-interval spike to $362/MWh at 06:40 during early morning with a mixed fuel environment, and a moderate spike to $253/MWh at 19:50. The midday event saw prices nearly double within a single interval and remain above $360/MWh for four consecutive intervals before moderating. Energy managers with WEM exposure should note the elevated intraday volatility profile on