Virginia Electric and Power (Dominion Energy Virginia) in late June filed with the Virginia State Corporation Commission an application for approval and certification of a project that includes rebuilding about 8.5 miles of an existing 230-kV line.
Specifically, the company proposes to:
- Rebuild, entirely within existing right of way (ROW) or on company owned property, the existing overhead, single-circuit transmission Line #231 on double-circuit structures, which runs from the company’s existing Landstown substation to the existing Thrasher substation, located in the City of Chesapeake and the City of Virginia Beach
- Replace 230-kV switches and perform minor conduit work at the Landstown and Stumpy Lake substations, as well as perform minor conduit work at the Thrasher substation
The company added that the proposed rebuild project would replace aging infrastructure that is at the end of its service life in order to comply with the company’s mandatory transmission planning criteria, thereby enabling the company to maintain the overall long-term reliability of its transmission system.
A majority of the line was built in 1965 on double-circuit “COR-TEN” towers, which have been identified for rebuild based on the company’s assessment in accordance with the planning criteria, the company said.
As part of the rebuild project, 44 230-kV double-circuit weathering steel lattice towers and two double-circuit 230-kV galvanized steel poles (Structures #81 and #101) supporting Line #231 would be replaced with 46 230-kV, double-circuit, galvanized steel poles.
The company also said that it anticipates that the rebuild project could be in service by Dec. 30, 2020, subject to commission approval and outage scheduling. The company requested a final order by the commission by July 15, 2019, noting that should the commission issues a final order by then, the company estimates that construction should begin on April 1, 2020 – road building – and be completed by Dec. 15, 2020.
The estimated conceptual cost of the project is $19m, which includes $18.5m for transmission-related work and $0.5m for substation-related work (2018 dollars), the company said.
Among other things, the filing noted that the PJM Interconnection board approved the proposed rebuild project in October 2017, as baseline project b2899.