Commodity Demand — SA1: Thursday 30 July 2026
South Australia's spot price sits at $400/MWh at 06:30 AEST (30 July 20:30 UTC settlement), with demand at 1649 MW — down from the overnight evening peak but still elevated for this time slot. The last 24 hours show extreme price sensitivity to demand swings: as demand climbed from ~1400 MW in the early hours to over 2170 MW by mid-morning (08:30-09:30 window), prices tracked upward from the $300-400 range into repeated $500-845/MWh prints, with a spike to $845 at 08:55 when demand hit 2187 MW. The tightest correlation is visible through the evening peak, where a demand ramp from 1408 MW at 18:00 to 1649 MW now has already produced volatility, including a $4,981/MWh spike at 16:35 and an $899/MWh print at 17:00 — both coinciding with demand pushing above 1470 MW during a low-wind, low-solar window (wind generation currently just 111 MW, solar at zero given overnight conditions).
The forecast trajectory points to a sharp de-escalation overnight: AEMO's forecast has prices falling from $500.44/MWh at 22:00 to $170.44/MWh by midnight, then into the $37-90/MWh band through the 01:00-05:30 window as demand troughs. This aligns with the identified low-price windows — the 05:00-06:00 slot averages $47/MWh and the 02:30-03:30 slot averages $67/MWh, both flagged as low-risk given minimal renewable output overnight. Expect prices to reverse quickly from 06:00 as forecast RRP climbs back to $101/MWh, then $163-209/MWh by 07:00-07:30, and a sharp jump to $400-521/MWh across the 08:00-09:00 morning ramp, mirroring today's pattern of low overnight wind (0.7% average wind potential) failing to offset the demand pickup.
Generation mix currently shows gas covering the bulk of supply — GAS_OCGT at 729 MW and GAS_CCGT at 533.82 MW — against just 111 MW wind and a 35.48 MW battery contribution, with renewable penetration at 10.39% and carbon intensity at 0.522 tCO2/MWh. This gas-heavy stack, combined with a short-notice outage of the Belalie-Davenport 275kV line (constraint S-DVBL_BC-2CP active since 16:30 yesterday) and a non-credible contingency event at City West substation, adds transmission-related pricing risk on top of demand-driven volatility. Traders should watch the 08:00-11:00 window today, where forecast prices exceed $400/MWh and last night's demand pattern suggests a repeat of 2100+ MW peaks is plausible given similar cold, low-wind conditions (current temperature 6.1°C, wind speed just 5.6 km/h).