Transmission line rebuild approved

The Valley Forge, Pennsylvania-based organization says rebuilding the 500-kilovolt line from Mount Storm in West Virginia and Doubs, Maryland would increase capacity more than 60 percent. It's expected to cost between $320 million and $370 million.

PJM says its board also reaffirmed support for the proposed Potomac-Appalachian Transmission Highline, or PATH, project. The 277-mile PATH project calls for a 765-kilovolt line from American Electric Power's John Amos plant in West Virginia, across parts of northern Virginia, to a substation near Kemptown, Maryland.

The $2.1 billion project won PJM approval in 2007, but regulators are still mulling approval.