Commodity Demand — TAS1: Wednesday 20 May 2026

Tasmania is sitting at 1,288 MW with a spot price of $112.21/MWh at 06:30 AEST, the highest level recorded across today's trading so far. This marks the third consecutive interval of rising prices as demand has climbed 94 MW in the past 35 minutes alone, following a steady evening ramp from a low of around 875 MW in the early hours of this morning (AEST). The demand trajectory is textbook winter peak behaviour: demand troughed around 10:00–11:00 AEST, held in a narrow 1,060–1,100 MW band through the mid-afternoon, then began its evening ascent from approximately 19:00 AEST. The price response has been proportionate — prices held between $87–$97/MWh through most of the off-peak period but are now breaking higher as demand approaches seasonal peak territory.

Price sensitivity to demand in this data is clear. Intervals below 1,100 MW consistently printed at $87–$88/MWh. The $96/MWh band held broadly between 1,100–1,270 MW. Above 1,280 MW, prices step up into the $109–$113/MWh range. The one notable outlier is the single spike to $241.72/MWh at the 06:00 UTC interval (16:00 AEST) when demand crossed 1,041 MW — relatively modest demand for that price, suggesting a brief supply-side tightness or dispatch constraint rather than a demand-driven event. The 6.5°C ambient temperature and heating demand of 11.5 units are sustaining the current upward pressure, with no solar generation contributing at this hour.

Forward forecasts for tonight's key intervals point to $101–$110/MWh for the 07:00 UTC half-hour (17:00 AEST) and a range of $105–$157/MWh for the 07:30 UTC interval (17:30 AEST) — the upper tail forecasts reflecting the uncertainty of demand peaking above 1,290–1,300 MW. Generation is currently 1,437 MW hydro and 68 MW wind, with gas OCGT at zero, meaning any incremental demand above current hydro output needs to be sourced via Basslink from Victoria or through increased hydro dispatch. The active South Morang transformer outage in Victoria (constraint set V-SMTX_F_R, in effect until 22 May) remains a factor constraining TAS-VIC transfer capacity, which adds a supply-side risk premium to any demand surge above current levels this evening.

Demand is forecast to remain elevated through the 08:00–09:30 UTC window (18:00–19:30 AEST) before gradually retreating. Traders and large consumers should expect prices to hold in the $100–$120/MWh range through the peak, with upside risk if demand prints above 1,300 MW given the constrained interconnector headroom. The overnight trough from approximately midnight AEST offers the clearest window of sub-$90/MWh pricing, consistent with the pattern seen across the past 24 hours.