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CX-012080: Categorical Exclusion Determination

Deering Lake and Yuma Substation Upgrades
CX(s) Applied: B4.6
Date: 03/06/2014
Location(s): Colorado
Offices(s): Western Area Power Administration-Rocky Mountain Region

Western Area Power Administration (Western) proposes to support the upgrade of Deering Lake Substation owned by Tri-State Generation and Transmission Association, Inc. (Tri-State). This will result in removal of equipment from Western's existing Yuma Substation. Y-W Electric Association, Inc. (Y-W Electric) and Tri-State have agreed to enter into a joint project to rebuild and upgrade the existing Tri-State's Deering Lake Switching Station into a new Deering Lake 115/69-Kilovolt (kV) and 115/12.47-kV Substation (Deering Lake). The existing four-breaker ring configured switching station will be converted into a six-breaker ring bus configured substation. Y-W Electric will construct separate 69-kV and 12.47-kV switching stations that will be adjacent to Tri-State's 115-kV substation. The project will also improve existing design/reliability deficiencies at both the Yuma and Deering Lake Substation.