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Spring Hill to Tysons 230 kV Underground Transmission Line Project

At Dominion Energy, we are committed to continually reviewing and maintaining our energy infrastructure to provide safe and reliable electric service. We believe solutions should always account for future energy needs while continuing to balance cost and impacts.

Project Overview

This project will replace a portion of an existing 230-kilovolt (kV) above-ground line in Tysons with a new 230kV underground line running from the existing Tysons substation on Tyco Road and terminating at a structure near the Future Spring Hill Substation southwest of Leesburg Pike and Spring Hill Road.

Project Overview Project Overview Approved Development Approved Development Key Locations Key Locations Rendering Locations No Activity Construction Beginning Soon Active Construction Construction Complete Phases are labeled chronologically for organization purpose. However, work may occur in multiple phases at once and may not necessarily work in chronological order. For example, work may begin in Phase C before Phase A, and could occur simultaneously. Construction may start at any location in the phases, not necessarily at the start point. Start dates and locations are determined by the construction team to complete the project safely and efficiently with the least amount of disruption to the community. Please refer to the progress identifiers to see if we have begun to work in each section.
Recent Updates

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  • Phase A
  • Phase B
  • Phase C
  • Phase D
  • Phase E
  • Vesper Trail
  • Manhole

Phase description

Phase Progress

Last Updated

Recent Updates

May 4-9, 2023 – Manhole #2 installation. This manhole is located in Phase B, and is one of two manholes to be installed for this project. Manhole work is complete, and trenching has begun starting at this manhole heading toward Spring Hill Rd.

May 30, 2023 – Manhole #1 installation work, originally scheduled for late April 2023, has been rescheduled to June 2-6, 2023. This manhole is located in Phase E and is one of two manholes to be installed for this project.

This manhole installation will require a closure of the Vesper Trail beginning Friday morning, June 2. The trail is expected to reopen Tuesday, June 6. Crews will work continuously throughout the weekend (day and night) to complete this work.

August 2023 – Trenching work is ongoing in Phase A and Phase C, primarily at night, with most of the work being within the roadways. Expect delays and detours if driving in these areas during nighttime hours.

Work along Vesper Trail will begin in November 2023 and last through early 2024. The trail will be closed while work is ongoing.

March 2024 – The Vesper Trail is open to use. Most duct bank installation has been completed and work will pick back up later in the spring with cable pulling along the underground route, installation of the overhead transition structure near the Vesper Trail, and work at Tysons Substation.