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PJM, ERCOT and Southwest Power Pool each set a new peak hourly load record in summer 2026, according to U.S. Energy Information Administration data. ERCOT’s 91.1-gigawatt peak on July 22 was 6.5% above its previous record; EIA said regional heat waves and a nationally record-hot summer drove up cooling demand.
PJM, the Electric Reliability Council of Texas and Southwest Power Pool each set a new record for peak hourly electricity load during summer 2026, according to data reported to the U.S. Energy Information Administration. Their peaks came during a nationally record-hot summer, when heat waves raised demand for air conditioning and put pressure on regional power systems.
PJM recorded a peak of 162.6 gigawatts on July 2, surpassing its previous hourly record of 160.6 GW, set June 23, 2025, by 1.3%. ERCOT reached 91.1 GW on July 22, up 6.5% from its previous record of 85.5 GW on August 20, 2024. The figures are the highest hourly loads reported for a day, rather than daily energy use.
Southwest Power Pool, identified as SWPP in the EIA report, reached 58.0 GW on July 27. That was 3.5% above its previous peak of 56.0 GW, recorded August 21, 2023. The three records are based on hourly data reported on Form EIA-930 and displayed in the agency’s Hourly Electric Grid Monitor.
The EIA said most of the peaks occurred during regional heat waves. It linked the high loads to increased cooling demand during what it described as the hottest summer on record nationally. The report also said several other grid operators came close to past peaks, but did not set new records in the EIA’s hourly data.
Heat Pushed Three Grids to New Peaks
Peak load records show how much electricity a grid had to serve during its most demanding hour, a useful measure of stress during extreme heat. Higher demand can leave less spare capacity available at the moment customers need power for cooling. The records alone do not show whether any grid experienced shortages, outages or reliability problems; the EIA report does not say that they did.
The scale and timing of the peaks matter for grid operators, utilities and consumers because heat-driven demand can rise quickly across large areas. ERCOT’s record was 6.5% above its previous high, the largest percentage increase among the three record-setting systems in the report. That comparison describes peak load relative to the stated historical record, not a measure of unmet demand or the amount of electricity consumed over the whole summer.
For households and businesses, the figures offer a clear indicator of how strongly heat can affect electricity use. They do not, by themselves, establish what caused any particular bill increase or predict future prices. Nor do they establish whether generation, transmission and demand-response resources were sufficient under every operating condition. Those questions require separate operational and market data.
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How the Summer Peaks Compare
The EIA’s comparison also shows that high loads were not limited to the three regions that set records. California ISO reached 50.0 GW on September 9, below its hourly record of 51.1 GW set in 2022. ISO New England reached 25.3 GW on July 2, short of its 25.9-GW record from 2025. New York ISO reached 31.1 GW on July 2, below its prior hourly-data peak of 31.9 GW from 2025.
The EIA noted a separate historical figure for New York: NYISO reports a 34.0-GW record from 2013, before the agency collected hourly data. For the Midcontinent Independent System Operator, the EIA monitor showed a 2026 peak of 121.5 GW on June 30, the highest in that monitor’s records, but below MISO’s reported peak of 127.1 GW on July 20, 2011. These distinctions reflect the data series and historical records being compared, not new records for those operators.
The report was published on October 15, 2026, and draws on figures submitted by balancing authorities through Form EIA-930. The EIA says those submissions represent the best values available when reported, while noting that reporting issues can affect data quality and that figures published directly by balancing authorities may differ.
“Most of these peaks occurred during regional heat waves, amid the hottest summer on record nationally, which drove up cooling demand.”
— U.S. Energy Information Administration
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What the Load Data Cannot Show
The EIA report identifies the peak hourly loads and compares them with earlier records, but does not provide a detailed account of reserve margins, generation availability, outages or local reliability during each peak. A record load does not by itself mean that electricity supply fell short, and the report does not claim that customers experienced power interruptions as a result.
The figures also carry a reporting caveat. Balancing authorities submit Form EIA-930 data, which the EIA makes available as reported; the agency says reporting issues may affect data quality and that its figures may differ from values published by the operators themselves. The report does not quantify the extent of any difference for these records.
The EIA attributes the high loads to heat-driven cooling demand, but its brief report does not break down the contribution from weather, population, economic activity or other factors in each region. It also does not make a forecast about whether the records will be exceeded in future summers.
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Operator Data and Future Peaks
The EIA’s October 15 report presents the summer figures as an analysis of data already reported through Form EIA-930. Readers seeking further operational detail can compare the agency’s hourly monitor with data published by PJM, ERCOT and Southwest Power Pool, keeping in mind that the EIA says the sources may not match exactly.
No additional investigation, revised estimate or next reporting date is specified in the report. The immediate next step is continued monitoring of hourly demand and later data releases, which can show whether subsequent heat events produce new peaks. The EIA data establish the records for the periods covered; what happens in later summers remains unknown.
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Key Questions
Which grid operators set peak load records in summer 2026?
PJM, ERCOT and Southwest Power Pool each set a new peak hourly load record, according to the EIA’s Form EIA-930 data.
What were the three record peaks?
PJM peaked at 162.6 GW on July 2, ERCOT at 91.1 GW on July 22, and Southwest Power Pool at 58.0 GW on July 27.
Why did electricity demand reach these levels?
The EIA said most of the peaks occurred during regional heat waves and linked the higher loads to increased cooling demand during a nationally record-hot summer.
Do the records mean the regions had power shortages?
No such conclusion is made in the EIA report. A peak load record measures the highest hourly demand reported; it does not, by itself, show whether supply was insufficient or whether outages occurred.
How reliable are the reported figures?
The EIA says Form EIA-930 data are reported by balancing authorities and made available as reported. It cautions that reporting issues may affect data quality and that operator-published figures may differ.
Source: primary
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