US Grid Operators & ISOs
The US electricity grid is managed by Independent System Operators (ISOs) and Regional Transmission Organizations (RTOs). These entities operate wholesale electricity markets, manage transmission, and coordinate the integration of clean energy resources.
All Grid Operators
ERCOT
(Electric Reliability Council of Texas)Texas isolated grid with energy-only market, leading in wind and solar capacity
Coverage: Texas
CAISO
(California Independent System Operator)California grid operator driving 100% clean energy by 2045
Coverage: California
PJM
(PJM Interconnection)Largest US grid serving 13 states and DC with 180+ GW capacity
Coverage: Pennsylvania, Ohio, Virginia, New Jersey, Maryland, North Carolina
NYISO
(New York Independent System Operator)New York grid with ambitious CLCPA clean energy mandates
Coverage: New York
ISO-NE
(ISO New England)New England grid managing offshore wind integration
Coverage: Massachusetts, Connecticut, Maine
MISO
(Midcontinent Independent System Operator)Midwest grid with major wind resources and transmission expansion
Coverage: Illinois, Michigan, Minnesota, Iowa
SPP
(Southwest Power Pool)Central US grid often exceeding 70% wind generation
Coverage: Colorado, New Mexico, Oklahoma, Kansas
Also explore by state
View clean energy information organized by state, including policies, projects, and market details.
View State Guides