The summer and fall of 2015 promise to be another busy period on NorthWestern Energy’s 37-mile, $45 million upgrade of its electric transmission line between Four Corners and Big Sky. Work again
will focus on the Gallatin Canyon area, from Hellroaring to the southern side of Deer Creek. The result of this project will be more reliable electric service for the Big Sky community, one of the fastest growing areas in NorthWestern’s service territory.
NorthWestern is upgrading the transmission line that runs from Four Corners, west of Bozeman, to the Meadow Village area of Big Sky. The existing 69 kV line is being upgraded to a 161 kV line, with 12.5 kV underbuild. The project will more than double the line’s capacity, more reliably serve existing electric needs in the area and allow for anticipated future demand growth. New poles and conductors will be installed on the line, which largely uses the existing 69 kV right of way. There are some minor changes to the line route at Cave Creek and Cascade Creek, as well as the elimination of two Gallatin River crossings.
Project Maps and Description