Commodity Demand — VIC1: Thursday 21 May 2026

Victoria's spot price sits at $119.97/MWh with demand at 6,183 MW as of 6:25 AEST, and both figures are climbing. The price history through today traces a textbook winter demand curve: demand troughed near 4,800 MW in the mid-afternoon around 15:00–17:00 AEST, with prices compressing into the $80–$97/MWh range during that trough. As demand has lifted through the evening — crossing 5,600 MW at 06:00 UTC (16:00 AEST), then accelerating past 6,000 MW — spot has responded with a near-proportional step up, confirming tight price sensitivity at the margin in the current dispatch stack. The generation mix at the latest interval shows brown coal at 4,612 MW, gas OCGT at 558 MW, wind at 571 MW, and battery at 184 MW, with solar negligible at 0.02 MW given the 7.2°C overnight condition and 100% cloud cover.

The demand trajectory today follows the morning peak pattern established in the price history data: demand cleared 7,500 MW during the 08:00–09:00 AEST window, producing sustained prices in the $118–$143/MWh band, before easing through the middle of the day to a trough around 4,800–5,000 MW as temperatures remained cool but heating demand briefly relented. The current re-escalation from that afternoon trough — driven by evening heating load in a 7.2°C, fully overcast environment — is tracking toward a second demand peak typical of winter Friday evenings. With max temperature forecast at only 15.1°C today and average wind potential near zero (0.1–0.2), there is no meaningful solar or wind uplift available to soften the price response to rising load.

The key constraint to watch is the South Morang F2 500/330 kV transformer outage, which remains active until 17:00 AEST today (22 May) per Market Notice 144122. This asset sits on the VIC1-NSW1 and V-SA interconnector equations, meaning VIC's import headroom from NSW is constrained under the V-SMTX_F_R constraint set. With interconnector flexibility reduced, the dispatch stack is leaning more heavily on local gas OCGT and battery to meet marginal load — assets that clear at higher offer prices than baseload, which is reflected in the elevated price floor through the overnight and morning periods. The latest forecast for the 07:00 AEST (21:00 UTC) interval clusters around $110–$120/MWh across the most recent runs, consistent with demand continuing to lift toward a 6,500–6,800 MW range as the evening progresses.

The load window data signals a material overnight price drop: forecast prices fall into the $10–$40/MWh range from approximately 11:00 AEST onwards (01:00–07:30 UTC Friday), as demand retreats toward the 5,800–6,000 MW overnight base and baseload thermal capacity dominates the stack. Demand-side participants and flexible industrial loads should note this window, particularly the 01:00–05:30 AEST band where multiple forecast intervals clear below $25/MWh. The South Morang transformer is scheduled to return to service at 17:00 AEST today, which — if the restoration completes on time — should restore interconnector capacity