🇺🇸 USA Electrical Grid
Reference profile of the USA electricity grid — grid frequency, synchronous area, and the main transmission & distribution operators with their operating voltages. Compiled from the TransformerPath worldwide grid census.
Grid operators
Eastern InterconnectionPJM, MISO, SPP, NYISO, ISO-NE, SERC — world's 2nd-largest sync area Record updated 11 July 2026765 kVSite →
Western Interconnection (WECC)CAISO + western utilities, 14 states + BC/AB + Baja Record updated 11 July 2026500 kVSite →
ERCOT (Texas)Standalone sync grid — DC ties only to East/Mexico Record updated 11 July 2026345 kVSite →
Related TransformerPath
Transformer-relevant projects
- Cardinal-Hickory Creek Transmission Line Project · 345 kV · energized
- Mankato–Mississippi River 345 kV Transmission Project · 345 kV · planned
- Big Stone South to Alexandria 345 kV Transmission Line (MISO LRTP) · 345 kV · planned
- SunZia Transmission (±525 kV HVDC) · 525 kV HVDC · energized
- Champlain Hudson Power Express (CHPE) · 320 kV HVDC · energized
- TransWest Express Transmission Project · 600 kV HVDC · construction
- Grain Belt Express Transmission Line · 525 kV HVDC · construction
- SOO Green HVDC Link · 525 kV HVDC · planned
- Maryland Piedmont Reliability Project (MPRP) · 500 kV · planned
- Beckham County–Potter 345 kV Project (SPP, TX–OK) · 345 kV · awarded
- Manning–Metcalf 500 kV Transmission Line Project (CAISO) · 500 kV · planned
- Southline Transmission Project · 345 kV · planned
- Coastal Virginia Offshore Wind (CVOW) · · construction
- Vineyard Wind 1 · · energized
- Sunrise Wind · · construction
- Empire Wind 1 · · construction
- SouthCoast Wind · · awarded
- Atlantic Shores South · · cancelled
- Nova Power Bank (BESS) · · construction
- Edwards Sanborn Solar + Energy Storage · · energized
- AEP Ohio New Albany Data Center Substation (Google) · · planned
- Entergy Louisiana Richland Parish Substation (Meta Data Center) · · construction
- ComEd Franklin Park Data Center Substation (Digital Realty) · · energized
- New England Clean Energy Connect (NECEC) · HVDC (1,200 MW) · energized
- Jamestown–Ellendale (JETx) 345 kV Transmission Line (MISO LRTP Tranche 1) · 345 kV · planned
- North Plains Connector (Grid United / ALLETE interregional HVDC, MT–ND) · · planned
Census verified 7 July 2026. Each operator row shows that operator record's own updated date. Operator, voltage and frequency data are as recorded and may change. Report a correction.
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