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PJM, ERCOT, and SWPP All Set Peak Load Records This Summer

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PJM, ERCOT, and SWPP All Set Peak Load Records This Summer

Support CleanTechnica's work through a Substack subscription , on Patreon , or on Stripe . Help us produce all of the high-quality, original content we publish week after week despite the challenges of content-scraping AI, antisocial media, inflation, and other hurdles. Three regional transmission organizations (RTOs) set records for peak hourly load this past summer, according to data reported on Form EIA-930 and presented in the Hourly Electric Grid Monitor :

PJM peaked at 162.6 gigawatts (GW) on July 2, 2026, 1.3% higher than the pre-2026 peak of 160.6 GW on June 23, 2025.

The Electric Reliability Council of Texas (ERCOT) peaked at 91.1 GW on July 22, 2026, 6.5% higher than the pre-2026 record of 85.5 GW on August 20, 2024.

The Southwest Power Pool (SWPP) peaked at 58.0 GW on July 27, 2026, 3.5% higher than the pre-2026 peak of 56.0 GW on August 21, 2023.

Most of these peaks occurred during regional heat waves, amid the hottest summer on record nationally, which drove up cooling demand.

Data source: U.S. Energy Information Administration, Hourly Electric Grid Monitor . Note: : ISO=independent system operator, MISO=Midcontinent Independent System Operator, CAISO=California Independent System Operator, NYISO=New York Independent System Operator, and ISO-NE=Independent System Operator New England.

The California Independent System Operator (CAISO) and the Independent System Operator for New England (ISO-NE) came within 2% of their previous records.



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