A split market overnight: strong wind output pushed SA1 and VIC1 through multiple negative-price windows — SA1 averaged −$1/MWh across the 24-hour period, VIC1 averaged just $4/MWh — while Queensland and NSW held firmer at $57/MWh and $54/MWh respectively. Three of six NEM interconnectors were binding simultaneously this morning, with VIC–NSW flowing ~1,002 MW northward. Watch QLD1 heading into the morning peak: demand was tracking up from an overnight trough near 5,350 MW toward 6,645 MW at 06:30 AEST, with spot at $65.69/MWh as of that read. A binding constraint — F_S+SETB_L1, shadow price $394/MWh — is signalling meaningful transmission scarcity in the southern NEM.
Tasmania hit 100% renewable penetration between 20:00–20:40 UTC on 18 June, with hydro and wind generating 1,228–2,009 MW across recorded snapshots and no gas online. Despite this, spot prices rose sharply from $4.18/MWh to $29.29/MWh during the same window — illustrating that high renewable share does not automatically suppress prices when system conditions tighten. TAS1's 24-hour average settled at $27/MWh, with a daily high of $78/MWh.
WA1 was the standout on price today. The market recorded two notable spikes: $270/MWh at 06:55 (sustained across three intervals) and $253/MWh at 13:15 — each representing sharp step-ups from preceding intervals and pointing to