Niagara Mohawk Power d/b/a National Grid on Aug. 30 filed with the New York State Public Service Commission an application for a certificate of environmental compatibility and public need for the rebuild of two existing 115-kV transmission lines, the Gardenville-Dunkirk 141 and 142 lines, from the North Angola substation to existing structure 4.
The lines are in the villages of Angola and Blasdell, towns of Evans, Hamburg and West Seneca, and City of Lackawanna, all in Erie County.
National Grid added that the existing 141/142 Lines, which originate at the Gardenville substation and terminate at the Dunkirk substation, share the same double-circuit steel towers, heading generally south-west for about 45 miles. The project would encompass the section of the existing 141/142 Lines from the North Angola substation to existing Structure #4, which is located about 0.35 miles south of the existing Gardenville substation for a total of 20.31 miles.
The main need for the project relates to the condition of those lines, National Grid added, noting that the project would replace deteriorated structures, conductor and shield wire along that section of the lines, which are more than 80 years old and have reached the end of their service lives.
The replacement of structures and conductor would also address capacity concerns that are frequently encountered during system operation. National Grid added that as part of the project, it proposes to replace the existing double-circuit towers with new double-circuit or triple-circuit, single-pole, galvanized steel structures, with the ability to carry two shieldwires.
The project consists of a number of different activities involving the existing 141/142 lines on each of six different segments. National Grid added that in Segments 1 through 6, with the exception of Segment 4-Existing, where the Existing 141/142 structures are proposed to be removed, the company proposes to rebuild the existing 141/142 Lines, which primarily feature 4/0 AWG (6/1) ACSR “Penguin” conductor, with 795 kcmil ACSR “Drake” (26/7) non-specular conductor. In Segments 1 through 6, National Grid also proposes to install one Optical Ground Wire (OPGW), and one 159 kcmil ACSR “Guinea” (12/7) for shieldwires. National Grid said that the ACSR shieldwire is sized to achieve a balanced fault-current with the proposed OPGW.
The project would also include work on the 34.5-kV sub-transmission lines that run parallel to the existing 141/142 Lines: the existing 856 Line, the existing 610 Line, and the existing 610 Tap.
Among other things, National Grid added that environmental studies and an environmental impact assessment for the project that were conducted by the company and its consultant TRC Solutions concluded that the construction and operation of the project would result in limited, temporary adverse environmental effects, which would occur primarily during the construction phase.