Cheyenne Light, Fuel and Power d/b/a Black Hills Energy on March 31 filed with the Wyoming Public Service Commission an application for a certificate of public convenience and necessity to build and operate two 115-kV substations, associated transmission lines, and related facilities in Laramie County, Wyo.
As noted in the filing, Microsoft Corporation, which has been growing its operations in Cheyenne since 2012, is under contract to purchase property in the newly formed Bison Business Park in order to expand data center operations in Cheyenne to a third data center campus location.
The company added in its filing that in consultation with Microsoft regarding its electric service and facility needs for the planned expansion, it determined that the Sweetgrass Project is necessary to extend service to Microsoft’s new data center campus.
The Sweetgrass Project includes the new 115-kV Sweetgrass substation and the new 115-kV and 24.9-kV Bison substation. The company added that the project also includes the expansion of the existing Cheyenne Prairie Generation Station (CPGS) substation and the South Cheyenne substation, as well as seven new transmission lines totaling about 11 miles in length.
In addition, the Sweetgrass Project would include an interconnection to the Cheyenne Light transmission system at the existing CPGS and South Cheyenne substations, as well as at the proposed Campstool substation.
The company added that the substations would be built of open-air bus work with standard 115-kV rated equipment.
The Sweetgrass substation construction, for instance, would include terminals for five 115-kV transmission tie lines from Cheyenne Light’s transmission system and one future line terminal.
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