Independent System Operators

Uncategorized

There are currently 5 Independent System Operators (ISOs) in the US–CAISO, MISO, ERCOT, NEISO, and NYISO–while three others–PJM, BPA, and SPP–fall under the broader umbrella of Regional Transmission Operators (RTOs) but serve a large market and are also tracked. The map below shows the rough geographical domain of each provider.

ISO/RTO	Full Name	Customer Base	Population Served
PJM	Pennsylvania Jersey Maryland	North Carolina, Virginia, West Virginia, Kentucky, Maryland, Delaware, Ohio, Pennsylvania, New Jersey, Illinois	61 Million
NYISO	New York ISO	New York	20 Million
NEISO	New England ISO	Connecticut, Rhode Island, Massachusetts, Vermont, New Hampshire, Maine	18 Million
MISO	Midcontinent ISO	Mississippi, Louisiana, Arkansas, Missouri, Illinois, Indiana, Iowa, Wisconsin, Michigan, Minnesota	24 Million
SPP	Southwest Power Pool	New Mexico, Oklahoma, Kansas, Nebraska, South Dakota, North Dakota, Montana	18 Million
ERCOT	Electric Reliability Council Of Texas	Texas	24 Million
CAISO	California ISO	California	30 Million
BPA	Bonneville Power Administration	Washington; Oregon; Idaho	10 Million