Dominion Virginia Power said it is proposing to replace the existing 500-kV Carson—Rogers Road Line #585 from Structure #3, outside of the Carson switching station, to Structure #142, located at a point north of the junction of Line #585 and Line #570 (Rogers Road Terminus), about 0.9 mile northwest of the company’s approved Rogers Road switching station in Greensville County that is under construction.
The company also said in its application filed with the Virginia State Corporation Commission (SCC) that the rebuild project would include new phase conductors and shield wires, and the replacement of the existing “COR-TEN” weathering steel lattice towers with galvanized steel lattice towers.
The company said that the in-service date for the proposed rebuild project is December 2018, and its estimated cost is about $52.9 million.
The rebuild project is necessary to assure that Dominion Virginia Power can continue to provide reliable electric service consistent with mandatory NERC reliability standards for transmission facilities, PJM Interconnection reliability standards and the company’s transmission planning criteria.
The company added that the existing Line #585 provides service to the company’s transmission system in the southern and central regions of Virginia, and is a critical component of the electric transmission grid that serves Virginia, North Carolina, West Virginia, the District of Columbia, Maryland and beyond.
The company said that its transmission facilities are not projected to meet PJM and NERC reliability standards unless the line is rebuilt to resolve the generator deliverability criteria violation identified by PJM and confirmed by Dominion Virginia Power. The existing Line #585 is projected to be in violation of that criteria following the loss of the 500-kV Carson—Rawlings Line #511.
Line #585 has also been identified as a facility reaching its end of life in the long term range — five to 10 years — and will need to be rebuilt to meet the company’s transmission planning criteria, the company added. From 2016 to 2025, peak electrical demand is projected to grow from 19,531 MW to 21,854 MW, an increase of about 11.9 percent, the company said.
Line #585 went into service in or about 1972, and after about 40 years of continuous operation, the line and its associated facilities are approaching the end of their service lives.
The company also said that the proposed facilities will afford the best means of meeting the continuing need for reliable service while reasonably minimizing adverse impact on the scenic, environmental and historic assets of the area, the company said, noting that the route for the project is located entirely within existing right of way (ROW).
The general character of the rebuild project areas is predominantly rural, and there are more than 12 named streams crossed by the rebuild project. The company also said that a search of the Virginia Department of Game and Inland Fisheries (DGIF) public database identified several federal and state listed species that have the potential to occur within the project area. The company said that it intends to minimize any impact on those resources and coordinate with DGIF as appropriate.
Among other things, the company noted that there are 55 dwellings located within 500 feet of the centerline of the existing Line #585 and the rebuild project, and one dwelling located within 100 feet of the centerline.