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The Cunningham-Dooms line is nearing the end of its useful life and needs to be replaced with new equipment to meet current standards.
As approved by the State Corporation Commission (SCC), the galvanized lattice structures will be chemically pre-dulled to mute the finish of the galvanized sheen. The conductor (line) will be dulled to mute its reflectivity.
Approximate total line length is 33 miles.
Typical structure description – The existing 500kV structures average 106 feet tall with a range from 72 feet to 149 feet. The preliminary approximate heights of the proposed towers range from 108 feet to 174 feet with an overall average height of 134 feet over this 32-mile rebuild project. Compared to the existing structures, the increase in average height is 28 feet. View existing and proposed configurations below:
Photo Simulations
The following simulations compare the existing and proposed views.
Photo simulations and diagrams provide representational views of proposed electric transmission facilities. These illustrations do not necessarily depict exact structure design or physical placement. All projects are subject to change and to final engineering.
Timeline
Overhead lines have proven to be the best choice for providing safe, reliable and economical energy to our customers. Underground transmission lines are not as desirable from an operational point of view. The duration of outages for underground high-voltage transmission lines is significantly greater compared to overhead lines due to the complexities of locating failures and facilitating repairs. Dominion Energy operates a high-voltage network of approximately 6,500 miles of transmission lines. Of this total, only about 1% (67 miles) is comprised of underground cables with zero at 500,000 volt level. These 115kV-230kV underground installations are primarily for dense metro areas or other areas that are not suitable for overhead lines.
As part of the SCC application, Dominion Energy completes an evaluation of potential impacts of the project. The company also submits annual Erosion and Sedimentation (E&S) Control Specifications and an anticipated list of transmission line projects for the construction and maintenance of transmission lines to the Virginia Department of Conservation and Recreation for review and approval. Our contractors receive copies of the E&S specifications and any additional permit conditions prior to construction and are completed to meet any requirements.
Impacts to farming will be minimal but should construction work within the right of way disrupt crop planting, Dominion Energy will compensate property owners accordingly.
Photo simulations and diagrams provide representational views of proposed electric transmission facilities. These illustrations do not necessarily depict exact structure design or physical placement. All projects are subject to change and to final engineering.
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