Comparison of Transmission and Distribution Lines
The differences between transmission and distribution lines can sometimes be confusing. Here is a quick comparison:
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.
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.