After more than five decades of operation, the COR-TEN® lattice structures and associated components along the nearly 18-mile line from our Dooms substation to our Valley substation in Augusta County need to be replaced in order to maintain reliability for our customers and add future operational flexibility into the system.
EventsSeptember 10, 2018
The SCC issued its final order, approving, among other things, the need for the rebuild project and authorizing the company to construct 500 kV single circuit lattice structures using chemically-dulled steel.
Our suggested approach is to rebuild this line in a manner that:
- Upgrades it to current standards.
- Provides future system flexibility for the long term by adding the option to add another transmission line on the same structure.
- Maximizing the use of existing rights of way.
The Dooms-Valley 500kV line was originally built in the early 1960s using COR-TEN steel, which, among other things, gave the steel a rust color. The idea behind using COR-TEN was that it would “seal” the steel with a form of rust patina that would prevent further natural rusting and corrosion. However, the patina layer has not performed as expected and is actually aiding in degrading the steel and reducing the durability of the lattice structures as a whole. Although well maintained, it has come time to address these concerns.
The key purpose of this project is to replace old infrastructure and add future operational flexibility into the system.
Existing Transmission Corridor Conditions:
- Project area is ~18 miles long
- Right of way width is primarily 150 feet wide
- Average structure height = 111 feet
SCC Approval Process
The State Corporation Commission (SCC) is responsible for verifying the need, determining the route and reviewing the environmental impact of certain transmission lines in Virginia.
On September 22, 2017, Dominion Energy submitted its application regarding the Dooms-Valley Project and on September 10, 2018, the SCC approved the project.
Documents related to the case are available to the public on the SCC Docket Search section of the SCC website, in the "Search Cases" section – Case Number PUR-2017-00114. In addition, interested parties may comment directly to the SCC by sending an email to firstname.lastname@example.org.
To learn more about this process, view our SCC process map.
Application – Filed September 22, 2017:Volume 1:
The following are the key dates and developments related to the SCC review timeline. For the most up-to-date and full listing of motions, rulings and other related documents, please refer to the SCC docket for this case.
- November 17, 2017 - The SCC issued an Order for Notice and Public Hearing which sets the procedural schedule for this case
- January 16, 2018 - Notices of Participation period ends
- February 20, 2018 - Respondent Testimony due
- February 22, 2018 - Local Public Hearings, Augusta County Government Center, 4:30 p.m. and 7:00 p.m.
- March 13, 2018 - Staff Report due
- March 27, 2018 - Company Rebuttal Testimony due
- April 5, 2018 - Public Comment period ends
- April 12, 2018 - SCC Public Evidentiary Hearing, State Commissions’ Courtroom, Second Floor, Tyler Building, 1300 Main Street, Richmond, VA @10 a.m.
- September 10, 2018 - SCC issues final order approving project