Central Hudson Gas & Electric, in a Feb. 20 Part 102 Report filed with the New York State Public Service Commission (PSC), said that it is proposing to rebuild a major portion of the existing single-circuit 69-kV G Line Transmission Line, with the rebuilt portion to be known as the G Line North Transmission Line.
The G Line North would run from the Todd Hill substation on Bushwick Road in the Town of LaGrange, northerly for about eight miles to Central Hudson’s Structure #1494, which is located about 1.4 miles north of the Tinkertown substation in the Town of Pleasant Valley.
The company added that the length of the line to be rebuilt in the Town of LaGrange is about 4.4 miles, while the length of the line to be rebuilt in the Town of Pleasant Valley is about 3.6 miles.
The existing G Line, which is about 85 years old, and the proposed rebuild for G Line North run entirely within Dutchess County, N.Y., the company said.
The G Line, which is currently supplied from the Knapps Corners substation on Spring Road in the Town of Poughkeepsie, runs in a northerly direction and adjacent to, but does not connect to, the existing Todd Hill substation. The line then continues on to connect to the Tinkertown substation and from there, runs to its termination at the Pleasant Valley substation in the Town of Pleasant Valley, the company added. In the rebuilt configuration, the G Line North would be supplied at a voltage of 69 kV from a new 115/69-kV transformer to be installed at the Todd Hill substation.
Three new disconnect switches would be mounted on the newly installed double pole Structure #1494, which would replace the existing lattice tower type structure to be removed, the company said. The remaining portion of the G Line North from Pole Structure #1494 to the Pleasant Valley substation is not being rebuilt as part of the project. The company further noted that the poles and wire for the portion of the existing G Line that runs from the Knapps Corners substation to the Todd Hill substation would be retired.
The company said that modifications to Todd Hill substation would be completed prior to the in-service completion date of the G Line North rebuild.
Construction of the G Line Rebuild is planned to begin in mid-2017, and the project’s estimated completion date is in mid-2018, according to the company.
The purpose of the project is to replace aging and deteriorated electric transmission infrastructure that has reached its end of useful life, as well as to provide a comprehensive rebuild of the line, which meets current electric utility design standards and provides enhanced storm hardening, the company said.
The portion of the existing line to be rebuilt includes a mixture of deteriorating original wood poles – about 50% of the total – and self-weathering steel poles of varying types and configurations, which were installed over previous years to replace deteriorated wood poles on an as-needed basis, the company said. As part of the rebuild and upgrade for the G Line North, all of the existing poles would be replaced with new self-weathering steel poles, which would range from about 52 feet to 75 feet tall, the company said.
In the Town of LaGrange, the number of new poles to be installed would be 66, compared to the current number of 84 poles, while in the Town of Pleasant Valley, the number of new poles to be installed is 49, compared to the current number of 58 poles, the company said.
“The G Line North rebuild will result in upgraded facilities and improved electric transmission supply reliability for the local areas served,” the company said.
The rebuilt G Line North would remain a single-circuit line with a voltage rating of 69 kV, the company said.
Among other things, the company said that most of the rebuilt line would be built in parallel with the existing G Line, without the need to take the G Line out of service. After the G Line North is successfully placed in service and the existing G Line has been de-energized, the poles and conductors for the portion of the line that was rebuilt would be removed, holes would be filled, and the disturbed areas would be seeded and mulched, the company said.
Central Hudson is a Fortis (NYSE:FTS) company.