Voltage not reported transmission 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 sections8,823mapped segments

Route length48,071 km29,870 mi

345 kV and above158,865 kmthe backbone

Owners194utilities and others

Filter lines

The whole-country map shows lines of 345 kV and above. Pick a state, owner or voltage to see lines down to 100 kV. Source: HIFLD Electric Power Transmission Lines (last updated August 2025).

Map

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735 kV and aboveHVDC500 kV345 kV220–287 kV100–161 kVUnder 100 kVVoltage not reported

Longest high-voltage lines

220 kV and above, highest voltage first

No 220 kV+ lines in this view.

Line length by state

Click a state to drill down.

Largest owners

By route length in this view. Click to map their lines.

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 · US power plants