United States βΊ Grid βΊ Transmission lines
OCTARY USA Β· TRANSMISSIONTransmission lines in the USA
The high-voltage lines that carry electricity from power plants to cities, with voltage, owner and the substations at each end. Click a state to drill down, or a line on the map for details.
Line sections94,619mapped segments
Route length950,434 km590,572 mi
345 kV and above158,865 kmthe backbone
Owners628utilities and others
Map
Loading linesβ¦
735 kV and aboveHVDC500 kV345 kV220β287 kV100β161 kVUnder 100 kVVoltage not reported
Longest high-voltage lines
220 kV and above, highest voltage first
| Between | Voltage | Length |
|---|---|---|
| Jefferson β Hanging Rock | 765 kV | 260 km |
| Massena β Marcy | 765 kV | 216 km |
| Baker β Broadford (765 Kv) | 765 kV | 203 km |
| Jefferson β Greentown | 765 kV | 202 km |
| Sorenson β Marysville | 765 kV | 188 km |
| Kammer (765kv) | 765 kV | 187 km |
| Jefferson β Rockport Station | 765 kV | 178 km |
| Flatlick β Marysville | 765 kV | 176 km |
| Sullivan β Rockport Station | 765 kV | 156 km |
| Wilton β Dumont | 765 kV | 146 km |
| Jacksons Ferry β Wyoming | 765 kV | 145 km |
| Kammer (765kv) β South Canton 765kv | 765 kV | 128 km |
| Greentown β Dumont | 765 kV | 126 km |
| Axton β Jacksons Ferry | 765 kV | 118 km |
| Sorenson β Dumont | 765 kV | 118 km |
| Belmont β Mountainteer | 765 kV | 107 km |
| Cloverdale 765kv β Jacksons Ferry | 765 kV | 105 km |
| Culloden β Wyoming | 765 kV | 94.1 km |
| Cloverdale 765kv β Joshua Falls | 765 kV | 91.1 km |
| Massena | 765 kV | 90.0 km |
| Jacksons Ferry β Broadford (765 Kv) | 765 kV | 78.6 km |
| Kammer (765kv) β Belmont | 765 kV | 78.5 km |
| John Amos β Mountainteer | 765 kV | 75.0 km |
| Gavin β Culloden | 765 kV | 67.9 km |
| Cook β Dumont | 765 kV | 57.8 km |
Line length by state
Click a state to drill down.
AK2.8k kmME5k kmVT2.6k kmNH3k kmWA26k kmID14k kmMT22k kmND22k kmMN28k kmIL25k kmWI21k kmMI23k kmNY24k kmRI715 kmMA5.7k kmOR20k kmNV12k kmWY14k kmSD17k kmIA16k kmIN24k kmOH27k kmPA20k kmNJ5k kmCT3k kmCA62k kmUT15k kmCO22k kmNE17k kmMO23k kmKY22k kmWV9.4k kmVA17k kmMD6.6k kmDE1.5k kmAZ20k kmNM14k kmKS19k kmAR14k kmTN22k kmNC26k kmSC23k kmDC123 kmOK27k kmLA14k kmMS15k kmAL23k kmGA27k kmHI1.2k kmTX94k kmFL30k km
Largest owners
By route length in this view. Click to map their lines.
- Pacificorp29,506 km Β· 5,367 km at 345 kV+
- Oncor Electric Delivery Co.28,768 km Β· 8,064 km at 345 kV+
- Bonneville Power Administration25,955 km Β· 10,011 km at 345 kV+
- Georgia Power Co25,062 km Β· 2,131 km at 345 kV+
- Pacific Gas & Electric Company24,324 km Β· 2,259 km at 345 kV+
- Tennessee Valley Authority21,943 km Β· 3,020 km at 345 kV+
- Alabama Power Co18,043 km Β· 701 km at 345 kV+
- WAPA-- Western Area Power Administration17,129 km Β· 1,530 km at 345 kV+
- Ameren Illinois Company16,544 km Β· 2,602 km at 345 kV+
- Otter Tail Power Co15,615 km Β· 862 km at 345 kV+
- Duke Energy Carolinas, LLC15,349 km Β· 559 km at 345 kV+
- American Transmission Co11,277 km Β· 2,330 km at 345 kV+
- Union Electric Co - (mo)11,000 km Β· 1,920 km at 345 kV+
- Virginia Electric & Power Co10,657 km Β· 1,626 km at 345 kV+
- Niagara Mohawk Power Corp.10,319 km Β· 1,370 km at 345 kV+
- Public Service Co Of Oklahoma10,253 km Β· 1,272 km at 345 kV+
- Entergy Arkansas Inc10,000 km Β· 1,411 km at 345 kV+
- Northwestern Energy LLC - (mt)9,966 km Β· 367 km at 345 kV+
- Oklahoma Gas & Electric Co9,811 km Β· 1,879 km at 345 kV+
- Ohio Power Co9,273 km Β· 609 km at 345 kV+
Source: Homeland Infrastructure Foundation-Level Data (HIFLD), Electric Power Transmission Lines. HIFLD Open closed in September 2025; this is the last public version (August 2025). Lines are mapped from imagery and utility filings; some voltages and owners are not reported. Lengths are route lengths of the mapped sections. Interconnection queues Β· US power plants