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Grading, site prep, compressor station work and pipe-laying along Highway 25 and various locations in Trousdale County began October 2025.

Today, many of the locations where large, 30-inch green pipe lay staged for installation along an existing pipeline has been buried, back filled and cleaned up for reclamation, with site restoration continuing into the spring of 2027.

鈥淚f pipeline (buried down to four feet in ground and five feet under streams) has gone through a hay field or another crop field or whatever it is, once the work is completed, it can go back to whatever service it had before,鈥� said Art Haskins, Manager Stakeholder Engagement with Enbridge.

With 80% of the ETNG Hartsville Compressor Station completed, and 72% of the pipeline in place, the Ridgeline Expansion Project is right on schedule to be tied together by Oct. 1 and delivering natural gas to the Tennessee Valley Authority (TVA) Kingston Fossil Plant by Nov. 1.

The ETNG Hartsville Compressor Station is a major component of the over $1 billion Ridgeline Expansion Project. An open house, tour and project update was held last Monday at the compressor station located at 625 Boat Dock Road, Hartsville.

The event provided attenders and elected officials with an opportunity to meet the project construction team, tour the grounds and compressor plant 鈥� a 14,600-horsepower facility designed to maintain the area鈥檚 rural aesthetic and local landscape. The station is also fully enclosed with soundproofing.

The Hartsville Compressor Station uses electric-driven compressor units primarily with power supplied from TVA and Tri-County. The electric driven compressors are also supported by the adjacent 80-acre solar array.

To maintain pipeline flow to the Kingston TVA plant during a power outage in Trousdale County, the station relies on natural gas-fired compressor units as backup.

鈥淭ri-County has done of phenomenal job of assisting us,鈥� said Brian Kuta, Enbridge Senior Project Manager. 鈥淭hey鈥檝e been the best utility company we have worked with through eight counties. We鈥檝e also enjoyed working with the county鈥檚 Building Official Rosalie Myhan, she鈥檚 been fantastic.鈥�

According to officials during the tour, in the next two months, the compressor station site will look different than it does today. As the construction project winds down and construction materials and equipment is used or moved off site, the back entrance to the meter station will close down leaving one entrance into the facility off Boat Dock Road.

For safety security reasons, there will be a few, down-facing LED lights on the grounds but night lighting should not cause issues with any dark sky initiatives. It was noted that bright lights seen currently in evening hours are due to electricians working on the project at night to meet the contracted completion date.

With numerous safety measures and protocols in place, the facility will be continuously monitored by highly trained personnel, site security personnel and protocols mandated by federal and state organizations. Onsite emergency shut down systems, bypass valves and pressure relief valves are also in place.

Enbridge utilizes hydrostatic testing as a primary preventative safety measure to verify the structural integrity of both new and existing pipelines. The process involves isolating pipeline segments, filling them with water and pressuring the line to levels well beyond the normal operating pressures of lines with natural gas. The pressure is held for several hours while engineers monitor for pressure drops or leaks.

The water used for the hydrostatic testing will come from sources approved by the Tennessee Department of Environment and Conservation. The water is then filtered and returned after the testing following the approved TDEC process.

The tour also highlighted the economic and operational importance of the pipeline expansion and new compressor facilities for Trousdale County and surrounding communities. While boosting the reliability of cleaner, regional power and utilizing electric-driven technologies, the operation is expected to generate millions in tax revenue for the county.

鈥淓nbridge has been, and remains, a great corporate partner with Hartsville-Trousdale County, participating in multiple events and community causes,鈥� said Trousdale County Mayor Jack McCall.

During the construction of the pipeline and compressor station in Trousdale County, Michels Corporation, an energy and infrastructure construction company, has had 105 to 125 crew members in the county, many of whom have rented housing during the year of project construction and boosted the local economy through purchases such as food and gasoline.

To learn more about the project, visit