Design and Construction

The proposed project would be constructed by the utilities and include the following components:

Approximately 95 miles of new double-circuit 230-kilovolt (kV) transmission line from the existing San Luis Valley Substation, north of Alamosa, to a new Calumet Substation near Walsenburg

A new 230/345-kV Calumet Substation at a location six miles north of Walsenburg on property owned by Tri-State and expansion of three existing substations

Approximately 45 miles of new double-circuit 345-kV transmission line between the proposed Calumet Substation and the existing Comanche Substation near Pueblo

Approximately six miles of new 230-kV transmission line between the proposed Calumet Substation and the existing Walsenburg Substation

Proposed communication facilities to support operation and maintenance of the transmission lines

Tri-State and PSCo are proposing to use a combination of steel lattice structures and steel mono-poles. The choice of structure type would be based on location and design conditions (i.e. mountainous vs. flat terrain). The line would also use low corona hardware to minimize audible noise.

Construction would be completed in several phases: access development, staging structures, foundation construction, framing and erecting the structures, stringing conductor, clean up and reclamation. Several work phases may be in progress simultaneously at different locations along the alignment. Construction of the transmission line is expected to last approximately 18 to 24 months.

Engineering and Electric Transmission Fact Sheet
Details on how the proposed transmission line will be constructed

Design and Construction

In the News