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Transmission Line Workers


A secondary power source is needed for the growing Johns Island area, which is powered by Santee Cooper, as well as the need for Dominion Energy South Carolina (DESC) to rebuild aging infrastructure in the Charleston area.

To serve the Johns Island area, Santee Cooper has requested a new “tie line” with DESC. The line will have dual ownership. DESC will own approximately six miles of the line from the existing Queensboro Substation on James Island to an interconnection point on Johns Island. From the interconnection point, Santee Cooper will own the remainder of the line up to their Johns Island Substation.

Additionally, because the existing DESC transmission line will be converted to become the Queensboro - Johns Island tie line, DESC will construct a new transmission line on the open side of its existing 170-ft right of way. This line will originate at DESC's Queensboro Substation and follow the existing right of way to DESC's Church Creek Substation.

This entire project is approximately 9.5 miles in length and will be done exclusively on existing right of way along an existing transmission corridor. All new transmission structures will be rebuilt on galvanized steel monopoles designed to meet all modern National Electric Safety Code requirements.

Letters will be sent to impacted property owners along the route as DESC gets closer to construction. Property owners can expect to see right of way flagging along the corridor. Because only one side of the existing 170-ft right of way has been utilized up to this point, there will be some tree trimming necessary to reclaim the full extent of the right of way.


  • Maintains current right of way
  • New structures located in the same general location as existing structures
  • Complies with mandatory standards to ensure safety, reliability and to meet future needs
  • Minimizes impact to the community and environment
  • Replaces aging infrastructure


The engineering design and environmental permitting began in the summer of 2020 and will continue in 2021. Line construction is expected to start in the 3rd quarter of 2021 and will continue through the end of 2022.

Contact Us

Call us M - F, 8am - 5pm

(866) 865-1466

Construction-Related Impacts

Service Interruption

Your electric service is not expected to be impacted by this project.

Equipment Lifespan

50+ Years

The equipment has been in service for 50+ years and needs to be replaced.


This project is not expected to impact traffic.


Noise levels will be moderate; permits are in place.

Construction Times

8am - 5pm

Most work will be completed between these hours, on weekdays.


This project may have limited environmental impacts.


Access to surrounding neighborhoods may be impacted.

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