Commodity Demand — TAS1: Friday 15 May 2026

Tasmania's spot price sits at $104.51/MWh at 06:35 AEST with demand at 1,019 MW, up sharply from the session low of around 981 MW recorded near 13:30 AEST when prices were holding in the $96/MWh band. The demand trajectory over the past 90 minutes tells the key story: load has climbed roughly 90 MW from the mid-afternoon trough near 930 MW, and price has responded in kind — each demand step above approximately 1,000 MW appears to push settlement prices through the $100/MWh threshold, while demand below that level consistently clears in the $96/MWh range. This $96–$106/MWh corridor has been the dominant price structure throughout today's trading, with the single notable outlier being a $138.93/MWh spike at 01:10 AEST (15:10 UTC) on demand of just 968 MW, suggesting an intermittent supply-side constraint rather than a demand-driven event.

The demand profile today follows a clear Saturday winter pattern: overnight trough near 980–1,000 MW through the early hours AEST, a morning ramp peaking around 1,210 MW between 17:45–18:00 AEST, a midday reduction back toward 930–960 MW through the early afternoon, and now a second build into the Saturday evening period. At the current trajectory, demand is on course to approach the 1,050–1,100 MW range through 08:00–09:00 AEST, consistent with the $100–$107/MWh price band seen during this morning's equivalent ramp. The most recent STPASA forecast for the 07:00 AEST half-hour (21:00 UTC target) is $98.20/MWh, suggesting the dispatch engine is expecting demand to ease slightly from the current level before the next material step up.

Generation is currently 864 MW hydro and 226 MW wind — 1,090 MW total local output against 1,019 MW of demand, with gas OCGT at zero. The surplus implies Basslink is likely exporting to Victoria at this interval, which means Tasmania's price is partly anchored to the Victorian settlement price rather than purely to local marginal cost. This interconnector dynamic compresses the local price floor and helps explain why prices have held relatively tightly in a $8–$10/MWh band despite demand moving 90–300 MW across the day. The heating demand signal is modest at this temperature (12°C, heating demand index 6), so today's evening demand build is expected to be gradual rather than a sharp spike.

Forward indications for the overnight period (07:30–10:00 AEST, 21:30–00:00 UTC) are pointing to $106–$113/MWh in the 21:30 UTC half-hour, reflecting the next demand ramp. Load windows through the 08:30–12:00 AEST period (22:30–02:00 UTC) are forecast in the $88–$96/MWh range as demand retreats to the overnight trough, which is consistent with historical Saturday overnight patterns for this region. The key risk to this outlook is any unplanned Basslink de-rating or export constraint that would tighten the local balance; no active market notices specific to TAS1 interconnector limits are current, so the base case remains a well-supplied overnight with prices tracking demand closely in