The Potomac-Appalachian Transmission Highline (PATH) was a proposed 290 mile 765 kilovolt electric power transmission line designed to supply power from the Amos Substation in Putnam County, West Virginia, to a proposed electrical substation to be constructed in Frederick County, Maryland. If approved, the transmission line would have been owned and operated by subsidiary companies of Allegheny Energy and the American Electric Power Company. The route proposed would have gone through 13 counties in West Virginia, three counties in Virginia, and Frederick County in Maryland. The endpoint in Maryland would be a proposed electrical substation in Kemptown, Maryland, that would be in a residential area surrounded by about 1,300 houses. The Kemptown substation would have been the largest substation ever built by Allegheny Power. The project was cancelled by PJM Interconnection in 2011. Application status 2009 Initial applications for regulatory approval to construct the PATH transmission line were filed in 2009. On September 9, 2009, the Maryland Public Service Commission rejected the application as improperly filed. PATH was given 30 days to declare whether they would refile in Maryland, but only announced they were reconsidering their options. On October 19, 2009, the Virginia State Corporation Commission filed a motion to dismiss the PATH application in Virginia, citing inability to adequately analyze the project due to an uncertain Maryland termination point. On October 28, 2009 an attorney for the West Virginia Public Service Commission moved to dismiss the PATH application in West Virginia. Virginia and West Virginia are requesting rejection of the application without prejudice, meaning PATH will be able to refile in those states once they have refiled a proper application in Maryland. 2010 Allegheny Power filed applications with Frederick County for a special exception to locate an electric power substation in agricultural zoned land. On September 15 they met with the Frederick County Planning Commission make a case that this is consistent with the Frederick County Comprehensive Plan. The commission found a substation of this size and at this location to be "inconsistent with the county's comprehensive plan." On September 29, 2010, there was a hearing for the Frederick County Board of Zoning Appeals at which PATH will submit a special exception zoning request. After several hearings, on November 18, 2010, the application for a special exception was denied. On December 20, 2010, Allegheny Power asked the Frederick County Board of Appeals to reconsider, and the board denied this