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RTO/ISOs

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California Independent System Operator

Date Founded1998
Territory Served (in full or in part)California, Nevada
CAISO Homepage

Western Energy Imbalance Market

Electric Reliability Council of Texas

Date Founded1970
Territory Served (in full or in part)Texas
ERCOT Homepage

Independent System Operator New England

Date Founded1997
Territory Served (in full or in part)Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island and Vermont
ISONE Homepage

Midcontinent Independent System Operator

Date Founded2001
Territory Served (in full or in part)Montana, North Dakota, Minnesota, Wisconsin, Michigan, Indiana, Kentucky, South Dakota, Iowa, Arkansas, Mississippi, Louisiana, Texas, Missouri, Illinois
MISO Homepage

New York Independent System Operator

Date Founded1999
Territory ServedNew York
NYISO Homepage

PJM Interconnection

Date Founded1927
Territory Served (in full or in part)Delaware, Illinois, Indiana, Kentucky, Maryland, Michigan, New Jersey, North Carolina, Ohio, Pennsylvania, Tennessee, Virginia and West Virginia
PJM Homepage

Southwest Power Pool

Date Founded1941
Territory Served (in full or in part)Arkansas, Iowa, Kansas, Louisiana, Minnesota, Missouri, Montana, Nebraska, New Mexico, North Dakota, Oklahoma, South Dakota, Texas and Wyoming
SPP Homepage

Western Energy Imbalance Service Market