The Public Utilities Regulatory Authority (PURA) of Connecticut, in recent separate draft decisions, granted approval to Connecticut Light and Power d/b/a Eversource Energy (NYSE:ES) of the construction of two projects.
As noted in the company’s March petition in Docket No. 17-03-74, Eversource requested that the PURA approve the method and manner of construction and provide permission to energize modifications to the 1620 Line and 1975 Line within an existing right of way (ROW) in Haddam, Conn.
The purpose of the project is to upgrade a portion of the 115-kV 1620 Line and a portion of the 115-kV 1975 Line by replacing structures that are exhibiting age-related degradation. The company further noted that the total length of the project is about 7.9 miles. The project involves replacing 64 existing structures with 56 115-kV double-circuit weathering steel direct-embed monopole structures and eight 115-kV single-circuit guyed weathering steel H-frame structures ranging in height from 68 feet to 107.5 feet above ground.
The existing 1272-kcmil 45/7 ACSR conductors will not be replaced and will be relocated onto the new structures. The company added that the existing shield wire will not be replaced and will be relocated onto the new structures.
The company said that the original construction of the 115-kV lines was approved by state regulators in 1946 and 1954. The 115-kV lines were rebuilt onto the laminated wood poles as part of a 345-kV line project approved by state regulators in March 1972. Further modifications of the 1975 Line were approved by state regulators in August 2006, the company added.
Construction of the project is scheduled to begin in April, and completion is anticipated in June, the company said.
In its March petition in Docket No. 17-03-89, Eversource requested that the PURA approve the method and manner of construction and provide permission to energize the 1779 Line upgrade project within an existing ROW in the Connecticut towns of East Hartford and South Windsor.
The purpose of the project is to rebuild an approximately 4.6-mile portion of the 1779 Line by replacing the existing 115-kV double-circuit lattice towers that are exhibiting age-related degradation.
The company added that the project involves replacing 41 existing structures – 38 painted steel lattice towers, two single-circuit wood monopoles, and one three-pole wood structure – with 39 single-circuit weathering steel pole structures and one single-circuit weathering steel H-frame structure. State regulators approved the line in 1925.
The company said that the materials to be used include 39 single-circuit weathering steel pole structures and one single-circuit weathering steel H-frame structure, ranging in height from 90 feet to 160 feet above ground; one 115-kV conductor, 795 kcmil 26/7 strand aluminum conductor steel supported (ACSS) per phase (three total); one fiber optic shield wire (48 fibers); and ceramic insulators.
Construction of the project is scheduled to begin in June, and completion is anticipated in March 2018, the company said.
In each petition, the company said that project construction will involve multiple outages and re-energizing of the circuits as the proposed work is being performed, and for that reason, Eversource seeks permission to energize during and after the construction period.
In each draft decision – dated April 18 on the PURA’s website – the PURA said that it grants approval for the company to conduct commissioning tests and energize the facilities as necessary during construction and following completion of the projects.
The company is to advise the PURA of the date on which construction was completed, according to the draft decisions.