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EIA Today in Energy reports that PJM, ERCOT and SWPP all set peak hourly load records this past summer.

Record peak loads across three major grid operators show tight summer capacity just as data center demand grows, raising the risk of grid stress and increasing interest in flexible load and new generation.

업계 전문지Slicast · 2026년 10월 15일 14:00 UTC · 글로벌 · 출처: EIA Today in Energy

중요도 55

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.

The California Independent System Operator (CAISO) and the Independent System Operator New England (ISO-NE) came within 2% of their previous records. The New York Independent System Operator (NYISO) was within 3% of its previous record load, and the Midcontinent Independent System Operator (MISO) was within 4%, according to Form EIA-930.

- **CAISO** reached 50.0 GW on September 9, 2026, below its record high of 51.1 GW reached on September 6, 2022.

- **ISO-NE** reached 25.3 GW on July 2, 2026, below its record of 25.9 GW on June 24, 2025.

- **NYISO** reached 31.1 GW on July 2, 2026, below its previous record of 31.9 GW on June 24, 2025. NYISO reports a record of 34.0 GW set in 2013, before the Hourly Electric Grid Monitor began collecting hourly data.

- **MISO** peaked at 121.5 GW on June 30, 2026, the highest in the Hourly Electric Grid Monitor but below the previous peak of 127.1 GW on July 20, 2011, as reported by MISO.

Data from Form EIA-930 is reported to the U.S. Energy Information Administration by each balancing authority (BA) and is made available "as-is." The data BAs report represent best values at the time of reporting, but various reporting issues may limit the quality of these data. Data published directly by BAs may differ from the data in Form EIA-930.

*Data source: U.S. Energy Information Administration, Hourly Electric Grid Monitor. Note: Data are the highest hourly load for a given day. ISO = independent system operator; ERCOT = Electric Reliability Council of Texas; SWPP = Southwest Power Pool. MISO = Midcontinent Independent System Operator; CAISO = California Independent System Operator; NYISO = New York Independent System Operator; ISO-NE = Independent System Operator New England.*

*Principal contributor: Alex Mey*

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