Comparison of Transmission and Distribution Lines

The differences between transmission and distribution lines can sometimes be confusing. Here is a quick comparison:

Transmission Lines

Transmission lines are the big high-voltage lines that carry electricity over long distances, such as from a power station to a city, or from a grid to a city. They are generally high voltage and are placed on physically tall structures. Dominion Energy has about 6,600 miles of transmission lines.

Learn more about transmission systems and overhead lines.

Transmission lines

Distribution lines

Distribution Lines

Distribution or sub-distribution lines are lower in voltage, and are the final stage in the delivery of electricity to end users. They are part of a network that typically includes medium-voltage power lines, substations, pole-mounted transformers, low-voltage distribution wiring and meters. Dominion Energy has nearly 57,000 miles of distribution lines, 900 substations, 566,000 transformers and 1.1 million utility poles.

Learn more about distribution lines and what is typically found on an electric power pole.