Niagara Mohawk Power d/b/a National Grid on July 21 filed with the New York State Public Service Commission a Part 102 Report for the Tilden-Cortland #18 115-kV Transmission Line Conductor Clearance Refurbishment Project.
The line is about 31 miles long and runs from the Tilden substation in the Town of Jamesville, Onondaga County, to the Cortland substation in the Town of Cortland, Cortland County in New York, the company said, adding that the line traverses the towns of Cortlandville, Homer, Truxton, Tully, Fabius, and Lafayette.
The line is supported on single circuit wood pole H-frame structures for the entirety of the line, the company said. There is a loop to the Tully Center station off of structures 103 and 103 1/2, the company noted, adding that the Tully Center North and Tully Center South lines are about 1.9 miles long and supported on single circuit wood pole H-frame structures.
The Rock Cut Tap, off of structure 197 ½ is about 3.1 miles long and is supported on double circuit (DC) wood and steel poles with the T2770 OCRRA-Tilden #15 115-kV Line, the company said.
The Tilden-Cortland #18 Line shares its right of way (ROW) with the T6470 Lafayette-Clarks Corner #4 345-kV transmission line, for its entirety, and the T6140 Fenner-Cortland #3 115-kV line from the Cortland substation to structure 66, National Grid said.
The company owns the ROW for the project.
The line was built circa 1969, and since then, six structures have been replaced, the company noted.
The project is a maintenance project that is necessary to provide system reliability to the electric utility end users, as well as provide for public safety in areas where structure replacement or other methods are used to mitigate substandard clearances and maintain thermal ratings, the company added. Timely completion of the work is essential to mitigate potential impacts to customer reliability and public safety, National Grid said.
The Tilden-Cortland #18 Line, which crosses Interstate 81 along with multiple lower traffic roads, traverses through various land cover types, including agricultural areas, forested areas, rural residential areas and fallow land, the company said.
As part of the project, National Grid said that it proposes the replacement of 52 existing structures and the installation of 11 new “midspan” structures. The company said that the proposed structure replacements and midspan structure installations for the project would consist of single circuit wood pole H-frame structures, three pole “pulloff” structures, and a double circuit single wood pole suspension structure.
The proposed structures would be direct-embedded foundations and installed in 10-foot to 15-foot-deep augured holes, which would be stabilized with the use of steel culverts set vertically, the company said.
Among other things, the company said that the proposed work would take place within the developed ROW, which would minimize and/or avoid potential impacts to adjacent and nearby existing or planned land uses. Adjacent land uses may experience some temporary, short-term disturbances and inconveniences associated with construction, National Grid said, adding that no permanent impacts to land use or natural resources would occur as a result of the project.
National Grid said that project construction is proposed to begin on Oct. 1, and the target date for completion of the project is Jan. 31, 2018.