US Morning Demand Note, Wednesday, 15 July 2026
A deep and persistent heat surplus across the southern tier is the dominant price signal this morning. The 15-day national gas-weighted CDD accumulation sits at 221, running 95 units above normal, a margin that, even after a modest five-unit downward revision from the prior run, keeps the broader demand picture firmly supportive for Henry Hub and regional power.
The synoptic structure driving this is a heat dome anchored across Texas and the southern plains, with the ridge providing enough stability that run-to-run revisions are directional rather than disruptive. The sharpest point of model disagreement sits around 21 July, where the day-gap of 3.1 cooling degree days signals that the exact timing of any ridge erosion or trough intrusion from the west remains contested. If the ridge maintains its current axis without significant meridional shedding, the ERCOT signal, already running 184 units above normal, extends and power burn stays at or above current levels through the third week of the month. If the trough to the west gains traction and nudges the ridge axis eastward, that relief arrives sooner, likely bleeding into the south_west zone before it does the core Texas load belt.
The zone breakdown reflects two distinct demand regimes running simultaneously. ERCOT is the outlier in both scale and trend: the 15-day CDD count revised sharply higher by 25 units to 356, putting the zone 184 units above normal with no sign the ridge is releasing. South and West moved modestly higher as well, up seven units to 304, running 148 units above normal, the Southwest load centers and SoCal remain in the heat's grip with only incremental model-to-model movement. Both zones are unambiguously supportive for regional power prices and associated gas burn.
The Northeast picture is more nuanced. The revision there was the largest in absolute terms, down 22 units to 183 CDDs, still 73 units above normal, still supportive for Algonquin and TETCO M3 basis, but the directional shift warrants attention. A trough that has been gradually encroaching on the Mid-Atlantic could be trimming the hotter tail scenarios for the back half of the period. Importantly, the zone remains anomalously warm, so the revision reduces upside rather than flipping the read. The Midwest diverged modestly from the Northeast, nudging two units higher to 182 CDDs and running 104 units above normal, the most durable of the northern-tier signals, with Chicago Citygate and MISO both seeing sustained cooling load.
What changes the picture from here: the critical variable is whether the 21 July model spread resolves toward ridge persistence or a trough-driven break, which the next one or two runs should clarify. A sustained Northeast revision lower, particularly if it extends the current trajectory over several consecutive runs, would narrow the geographic footprint of the demand signal even as the southern tier holds. Any evidence of the ERCOT anomaly plateauing rather than extending would be the first meaningful shift in the dominant pattern.