Commodity Demand — TAS1: Thursday 21 May 2026

Tasmania's spot price is $105.18/MWh at 6:35 AEST with demand at 1,305 MW, sitting in the middle of a classic winter evening demand ramp that is now underway. The day traced a textbook autumn/winter demand curve: demand troughed around 1,060–1,075 MW in the 1100–1300 AEST window before beginning a steady climb from approximately 1500 AEST onward. The current 1,305 MW reading represents a ~245 MW lift from that intraday trough, and prices are responding in step — the sub-$100/MWh floor that held through the midday lull has given way to the $105/MWh range as demand builds. The overnight peak earlier in this period hit ~1,428 MW around 0730–0800 AEST, when prices briefly spiked to $153–$164/MWh, confirming that supply tightens measurably once demand clears the 1,350–1,400 MW band.

Price sensitivity in today's data is clear and asymmetric. Demand below ~1,300 MW consistently clears at floor-adjacent prices of $87–$101/MWh, as seen through the 1430–1930 AEST window when load sat in the 1,075–1,115 MW range and prices hugged $87–$97/MWh. Once demand pushes above 1,300 MW — as it does now — the marginal clearing price steps up into the $105–$120/MWh range, and above ~1,350 MW intraday spikes to $130–$165/MWh become frequent. This sensitivity band is narrow: roughly 100–150 MW of additional demand separates orderly $100/MWh pricing from volatile $150+ prints. Generation is currently 1,284 MW hydro and 28 MW wind, with gas OCGT at zero, meaning any further demand increase relies on hydro ramping or Basslink flow adjustments.

The forecast price for the next half-hour (07:00 AEST) sits at $112.89/MWh, consistent with demand continuing to build toward the evening peak. Forecasts targeting the 07:30–08:30 AEST half-hours cluster around $105–$107/MWh, suggesting the market anticipates demand stabilising rather than accelerating sharply from here. However, tonight's temperature sits at 7.2°C with a heating demand index of 10.8, and tomorrow's forecast maximum of only 16.3°C under 82% cloud cover indicates sustained heating load through the evening without the solar offset that reduces afternoon demand in warmer months. That profile supports demand reaching or exceeding the 1,350–1,400 MW range by 08:00–09:00 AEST, the zone where today's history shows price volatility becomes materially elevated.

The relevant network notice to watch is the South Morang F2 500/330kV transformer outage in Victoria (constraint set V-SMTX_F_R), active until 1700 AEST today, which constrains several interconnectors including Basslink (T-V-MNSP1). If Basslink's import or export capacity into Tasmania is restricted under this constraint while local demand is rising through the sensitive 1,300–1,400 MW band, the price response on the Tasmanian side could be sharper than the $105–$