Virginia Electric and Power (Dominion Energy Virginia) recently filed with the Virginia State Corporation Commission an application for certification of the Fudge Hollow-Low Moor Line #112 and East Mill-Low Moor Line #161 138-kV Transmission Line Partial Rebuild project.
The company said that in order to maintain the structural integrity and reliability of its transmission system in compliance with mandatory NERC Reliability Standards, it proposes – in Alleghany County and the City of Covington – to:
- Rebuild, entirely within existing transmission right of way (ROW), Virginia Department of Transportation (VDOT) ROW, or on company owned property, about 1.4 miles of the existing 138-kV overhead transmission Lines #112 and #161, which are collocated primarily on steel towers running from the company’s existing Fudge Hollow station to the existing Covington substation
- Rebuild three existing structures between the Covington substation and the Line #112 and #161 Junction entirely within existing ROW
- Rebuild, entirely within existing ROW, about 3.9 miles of the existing 138-kV overhead transmission line #112 on steel towers running from the Line #112 and #161 Junction to the Line #112 and #133 Junction
- Replace existing shield wire within the entire existing 7.3-mile, 138-kV overhead transmission corridor between the company’s existing Fudge Hollow and Low Moor substations, which contains Line #112 and a segment of Line #161 and Line #133, with one fiber optic shield wire, which would facilitate company network telecommunications between the Fudge Hollow substation and Low Moor substation
- Perform minor work at the existing Fudge Hollow, Covington, and Low Moor substations, including conductor and connector replacement
The company noted that Line #112 was built in the 1920s and that the single- and double-circuit structures that would be replaced include 33 steel lattice structures that have been identified for rebuild based on the company’s assessment in accordance with the company’s mandatory transmission planning criteria. Those specific structures have experienced severe corrosion at grade and their foundations are no longer considered dependable, the company said.
The proposed rebuild project would primarily replace aging infrastructure at the end of its service life in order to comply with the company’s mandatory planning criteria, thereby enabling the company to maintain the overall long-term reliability of its transmission system. The company added that because the existing ROW and company owned property is adequate to build the proposed project, new ROW is not necessary.
The company noted that it anticipates that the rebuild project could be in service by Dec. 31, 2020, subject to commission approval and outage scheduling. The company said that it estimates that it would take about 19 months for detailed engineering, scheduled outages, materials procurement, permitting, and construction after a final order from the commission.
Accordingly, to support that estimated construction timeline and construction plan, the company said that it requests a final order by April 30, 2019. Should the commission issue a final order by that date, the company estimates that construction should begin on Jan. 1, 2020, and be completed by Dec. 31, 2020.
The company also said that the estimated conceptual cost of the project is about $11.3m, which includes $11m for transmission-related work and $0.3m for substation-related work (2018 dollars).