Largest U.S. ISO's by energy production June 2020

PJM Interconnection is the largest regional transmission organization and largest independent system operator in the United States. In June 2020, it generated 2,391 gigawatt hours of electricity, more than Midcontinent Independent System Operator (MISO), and Electric Reliability Council of Texas (ERCOT). PJM is headquartered in Pennsylvania and serves parts of most Mideastern states from New Jersey to Virginia and Delaware to Indiana. Natural gas and nuclear power are its greatest sources of electricity generation.

Leading regional transmission organizations and independent system operators in the United States as of June 2020, by power generation (in gigawatt hours)

Characteristic	Generation of fuel in gigawatt hours
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Release date

July 2020

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Region

United States

Survey time period

June 2020

Supplementary notes

California independent system operator (CAISO) - ISO; Electric Reliability Council of Texas (ERCOT) - ISO; Midcontinent Independent System Operator, Inc. (MISO) - RTO; ISO New England (ISO-NE) - RTO; New York Independent System Operator (NYISO) - ISO; Ontario Independent Electricity System Operator (IESO) - ISO; PJM Interconnection (PJM) - RTO; Southwest Power Pool (SPP) - RTO.

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