commodity demand sa — SA1
SA1 spot is at $30.29/MWh with demand at 1,504.61 MW as of 16:35 AEST — a morning ramp that has driven prices from the overnight trough of near-zero into the high $20s-$30s range. The demand-price relationship is clear in yesterday's history: overnight demand bottomed near 1,260–1,280 MW with prices in the $16–$24/MWh band, then the solar-driven midday demand collapse on 12 March pushed net demand below 500 MW and prices to negative extremes, touching -$95.07/MWh at 23:05 UTC (09:05 AEST). As rooftop and utility solar faded through the late afternoon, demand recovered sharply from ~470 MW back toward 1,500 MW and prices reset firmly positive, tracking the demand recovery step-for-step.
The current morning ramp is following the same structural pattern. Demand has climbed ~230 MW since 15:40 AEST as solar generation drops to zero and heating demand activates — weather shows 14°C with a heating demand index of 4 and cloud cover at just 6%, meaning the solar collapse this morning was swift. Wind is supplying 841 MW with gas CCGT contributing 84 MW, giving a renewable penetration of 89.33% and carbon intensity of just 0.0523 tCO2/MWh. Gas dispatch remains minimal, which is why prices at 1,500 MW demand are clearing in the $27–$30/MWh range rather than escalating further — wind is absorbing the marginal need.
The key price risk today is the pre-solar trough period from roughly 19:00–21:00 AEST. Based on 12 March's pattern, demand will continue lifting through the morning peak toward the 1,550–1,572 MW range seen yesterday around 17:00–19:30 AEST, where prices tested $25–$31/MWh. Once rooftop solar ramps after 09:00 AEST, net demand will compress sharply and prices will again collapse toward zero or negative — wind surplus is the primary driver given 841 MW already online before sunrise. The forecast RRP signal of $21.17/MWh for the 07:00 AEST trading period is consistent with that trajectory: slightly softer than current spot as solar begins eroding net demand. Grid stress is scored at 72.3, reflecting the demand transition risk at ramp events rather than sustained high-load pressure.
Demand-side participants should note the window from approximately 08:00–10:00 AEST as the highest-value load-shifting opportunity, aligning with forecast negative pricing consistent with yesterday's -$59/MWh prints during peak solar hours. The evening ramp from 17:30 AEST onward carries the primary upside price exposure for the day — load curtailment or battery discharge targeted at the 18:00–20:00 AEST window is where price sensitivity to incremental demand will be sharpest, particularly if wind output softens from current levels.