Commodity Demand — TAS1: Monday 15 June 2026

Tasmania spot is at $69.18/MWh with demand sitting at 1,189 MW as of 06:30 AEST — well below the overnight peak of 1,526 MW reached around 08:10–08:15 AEST and the morning shoulder of ~1,497 MW at 18:00 AEST. The demand-price relationship across today's cycle is unusually compressed: prices held a tight $77.26–$77.28/MWh band through the entire 1,400–1,526 MW range during the morning peak, then stepped cleanly down to $60.10/MWh as demand fell through the 1,100–1,200 MW midday trough. This band-like pricing behaviour points to a stack with distinct price tiers rather than a smooth supply curve — demand needs to cross a supply stack threshold to trigger a price step, which it did around 06:35 AEST on the way up (at ~1,374 MW) and again around 09:35 AEST on the way down (at ~1,421 MW). The current $69.18/MWh sits in a transitional zone as demand rebuilds from its 1,016 MW floor recorded at 03:45 AEST.

The evening ramp is now underway. Demand has climbed from that 1,016 MW trough through 1,189 MW currently, tracking the same trajectory as the morning build. At 8.2°C with 100% cloud cover and a heating demand index of 9.8, residential and commercial heating load is the primary driver — conditions that persist into tomorrow with a forecast max of just 11.2°C and no solar input. The demand-price inflection point observed this morning at ~1,374 MW is the key level to watch: if the evening ramp pushes through that threshold, prices are likely to re-enter the $77/MWh tier. Generation is currently 989 MW hydro and 36 MW wind, with gas OCGT at zero, consistent with the stack positioning implied by current prices.

Forecasts point to a sharper price escalation tonight than the morning session delivered. The forecast runs $64.93/MWh at 07:00 AEST, stepping to $70.23/MWh by 07:30, then pushing to $80.65/MWh by 09:00 AEST and holding near $80.47–$80.57/MWh through to 10:00 AEST. That $80/MWh tier — roughly 15% above the morning peak price — implies the dispatch stack is pricing in higher demand tonight than was realised this morning, likely reflecting a colder overnight period as temperatures are forecast to remain near 8°C through early Wednesday. The 09:00–10:00 AEST window (23:00–00:00 local) represents the highest-priced period on the forward curve and aligns with typical Tasmanian late-evening heating demand persistence in winter conditions.

For the remainder of Tuesday, demand trajectory will be the single most important price signal. The $60.10/MWh floor holds while demand stays below the ~1,370 MW stack threshold; the $77–$80/MWh tier activates once demand clears that level on the evening ramp. Flexibility holders with exposure in the 08:00–10:00 AEST window tonight face the widest spread opportunity of the day. Overnight into Wednesday, forecasts revert to the