The week of 13–20 April 2026 delivered a mixed but broadly moderate NEM, bookended by elevated conditions in South Australia on the opening days and a general softening across the mainland through mid-week. Autumn demand profiles were evident across all regions — textbook morning and evening peaks flanking midday troughs — with the grid navigating the seasonal transition from summer cooling loads without any sustained system stress. Western Australia maintained its characteristic consistency, holding daily averages in a tight $99–$107/MWh band throughout the period.
Tasmania was the standout story of the week, achieving 100% renewable penetration on at least six separate occasions across seven days — a pattern that reflects the depth of the state's hydro resource as it heads into the higher-inflow months. More notable, however, was the persistent binding of the T_BLINK_TV_NGZ constraint, which registered an extraordinary shadow price of $7,308,000 on multiple days from 15 to 20 April. Despite this headline-grabbing figure, Tasmanian spot prices remained largely contained, signalling the constraint was managed through dispatch rather than flowing through to the reference price.
On the mainland, Queensland recorded the week's most significant constraint event, with the F_Q+8E_L1 constraint registering a shadow price of $182,700/MWh, pointing to an acute and localised network bottleneck affecting a Queensland transmission corridor. South Australia posted the highest daily average of the week at $176/MWh on 14 April, while Victoria recorded the lowest at just $16/MWh on 16 April, illustrating the divergence in regional conditions that can emerge even within a single 24-hour period.
Negative pricing was observed across several regions mid-week, consistent with the shoulder-season pattern of high daytime renewable output meeting reduced demand. Victoria touched -$48/MWh on 17 April, while SA1 reached -$31/MWh on 16 April and NSW1 recorded -$26/MWh on both 13 and 14 April. Queensland and VIC1 also recorded brief negative intervals across multiple
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