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Longman Dictionary of Contemporary English
power line
noun
EXAMPLES FROM CORPUS
▪ From Tempe to east Mesa, 10, 000 people lost electricity when high winds toppled a 12, 000-volt power line.
▪ They look like jittery, hysterical little birds crowded together on a power line.
Wiktionary
power line

alt. An electrical wire, cable or conduit, suspended in air by utility poles or transmission towers, or buried underground, used for the carrying of electricity either from a power source such as a generating station to a substation, or from a substation to a building such as a plant, commercial building or a home. n. An electrical wire, cable or conduit, suspended in air by utility poles or transmission towers, or buried underground, used for the carrying of electricity either from a power source such as a generating station to a substation, or from a substation to a building such as a plant, commercial building or a home.

WordNet
power line

n. cable used to distribute electricity [syn: power cable]

Wikipedia
Power Line
See Electric power transmission for the more common use of this term.

Power Line is an American political blog, founded in May 2002. Its posts were originally written by three lawyers who attended Dartmouth College together: John H. Hinderaker, Scott W. Johnson, and Paul Mirengoff. The site is published by Publir, founded by Joseph Malchow, also a Dartmouth graduate.

The site gained recognition among the American right for its role in covering the Killian documents story that aired during the 2004 Presidential campaign about forged documents relating to President George W. Bush's term of service in the Texas Air National Guard, which kept him out of the Vietnam war.

In 2004, Power Line was named Time magazine's first-ever "Blog of the Year." When AOL added blogs to their news website in 2007, Power Line was one of the five blogs included. A 2007 memo from the National Republican Senatorial Committee described Power Line as one of the five best-read national conservative blogs.