Granby Pumping Plant Switchyard-Windy Gap Substation Transmission Line Rebuild, Grand County, Colorado
Western Area Power Administration (Western), a power marketing administration in the U.S. Department of Energy (DOE), owns and operates the 69-kilovolt (kV) Granby Pumping Plant Switchyard-Windy Gap Substation (Project) transmission line in Grand County, Colorado. The transmission line is 13.6 miles long. Western proposes to rebuild the single-circuit line as a double-circuit line, increase the voltage rating to 138-kV, and operate one circuit at 69-kV and the second at 138-kV. One circuit would replace Western's existing transmission line between the Windy Gap Substation and Stillwater Tap and provide a redundant feed from the tap to the Granby Pumping Plant to prepare for when the existing 69-kV cable located in the Alva B. Adams Tunnel is no longer operable. The second circuit was requested by Tri-State Generation and Transmission Association, Inc. (Tri-State) to improve reliability for their local customer, Mountain Parks Electric, Inc., and to minimize environmental effects by sharing a right-of-way (ROW). The Notice of Availability (NOA) of the Final Environmental Impact Statement (EIS) was published in the Federal Register on July 5, 2013 (78 FR 40474). After considering the environmental impacts, Western has decided to construct, operate, and maintain the transmission line on the preferred alignment identified as Alternative D (Option 1), in the EIS.