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Three U.S. Power Grids Hit New Summer Peak Loads Amid Heatwave

1 reports1 sources10/15/2026 updated

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In July 2026, the PJM, ERCOT, and Southwest Power Pool (SWPP) transmission organizations all recorded new summer peak loads, driven by extreme heat and soaring cooling demand. PJM’s peak reached 162.6 GW on July 2—1.3 % above its 2025 record—while ERCOT topped out at 91.1 GW on July 22, up 6.5 % from 2024. SWPP’s highest load was 58.0 GW on July 27, a 3.5 % increase over its 2023 peak. These new highs underscore the growing strain on the U.S. electric grid during hot summer periods and highlight the need for enhanced capacity and resilience measures.

Written with AI from the reporting · updated 10/15/2026

Latest developmentOct 15, 22:00
PJM, ERCOT, and SWPP Set New Peak Hourly Load Records This Summer
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  1. 1Unclassified fact stationOct 15, 00:00recorded Oct 15, 21:47single sourcerevised

    PJM, ERCOT, and SWPP set peak load records this summer

    Read original source ↗ EIA Today in EnergyReplay this moment in the explorer
    Evidence & revisions · 1 source records
    Subject：
    U.S. Energy Information Administration
    Action：
    reported peak hourly load records
    Object：
    regional transmission organizations
    Occurred (fact side)：
    Oct 15, 00:00
    EIA Today in Energy ↗Report pageRevision 2 · currently revised
    Published (valid side)：
    Oct 15, 22:00
    First seen (known side)：
    Oct 15, 21:47
    Fact stationSingle source · one-sided claimRevised

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Oct 15
  1. EIA Today in EnergyFirst-party sourceRelated fact: single sourceSource report revised
    PJM, ERCOT, and SWPP Set New Peak Hourly Load Records This Summer

    Report first recorded Oct 15, 21:47

    Three regional transmission organizations—PJM, ERCOT, and SWPP—set new peak hourly load records this past summer, according to data from the U.S. Energy Information Administration. PJM peaked at 162.6 GW on July 2, 2026, which is 1.3% higher than its pre-2026 peak of 160.6 GW on June 23, 2025. ERCOT peaked at 91.1 GW on July 22, 2026, a 6.5% increase over its pre-2026 record of 85.5 GW on August 20, 2024. SWPP peaked at 58.0 GW on July 27, 2026, 3.5% higher than its pre-2026 peak of 56.0 GW on August 21, 2023. These peaks largely occurred during regional heat waves amid the hottest summer on record nationally, driving up cooling demand.

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