noun
power distribution line; power line
Refers to an electric power distribution line, typically carrying electricity from a substation to consumers.
台風で配電線が切れて、停電した。
The power line was cut by the typhoon, causing a blackout.
新しい配電線を敷設する
Construction to lay new power distribution lines has begun.
電線 is a general term for any electric wire or cable, whereas 配電線 specifically refers to power distribution lines.
Compound of 配電 (power distribution) + 線 (line). The exact historical derivation is straightforward; the term is a technical compound from the early 20th century.