Transmission Line Project
Texas-New Mexico Power Company (TNMP) intends to amend its Certificate of Convenience and Necessity (CCN) to construct approximately three miles of new transmission line in Galveston County, Texas. The Greenbelt-Cattail-Cherokee 138 kV Transmission Line Project will connect the existing Greenbelt Substation to a proposed new substation Cattail Substation Site, and then will connect the proposed Cattail Substation Site to the existing Cherokee Substation. The western-most substation (Greenbelt Substation) is located at the northwest corner of the intersection of 27th Street South and 5th Avenue South. The eastern-most substation site (Cattail Substation Site) will be located northeast of the intersection of 6th Street South and 2nd Avenue South. The southern-most substation (Cherokee Substation) is located 0.15 mile southwest of the intersection of 14th Street South and TX 197 Loop South. Depending on which route is selected in this process, the total length of the Project ranges from approximately three to four and a half miles long, composed of 2.18 to 2.70 miles for the Greenbelt to Cattail Segment and 1.58 to 1.89 miles for the Cattail to Cherokee Segment. The proposed project would have estimated total line costs ranging from $12.57 million to $18.41 million, composed of $6.62 million to $10.27 million for the Greenbelt to Cattail Segment and $5.95 million to $8.14 million for the Cattail to Cherokee Segment, depending on which route is selected. The associated installed substation costs remain the same for all routes and are estimated to be $15.13 million, which include the Cattail Switching Station, Cherokee Terminal addition, Greenbelt Terminal addition, and the addition of a terminal to the existing Texas City Main switching station and install of a 138/69kv autotransformer.
Alternative transmission line routes were identified on an overlay of the composite environmental and land use constraints map. These alternative transmission line routes were developed following field reconnaissance, public involvement, and review of environmental and social constraints. These alternative transmission line routes were developed based upon maximizing the use of routing opportunity areas while avoiding areas of high environmental constraints or conflicting land uses. Recent aerial photography was used as the background of the composite constraints overlay to identify optimal locations for the alternative transmission line centerlines. Not all alternative transmission line routes will be constructed. Rather, one alternative transmission line route will be selected by the PUCT.