FERC Approves 122-Mile Ridgeline Gas Pipeline Expansion in Tennessee
By Mary Holcomb, Digital Editor
(P&GJ) — The Federal Energy Regulatory Commission (FERC) has approved The Enbridge Inc.-sponsored Ridgeline Expansion Project, a 122-mile natural gas pipeline system designed to serve the Tennessee Valley Authority’s (TVA) new combined-cycle power plant in Morgan County, Tennessee.
FERC issued the certificate on April 2, 2025, following an application by East Tennessee Natural Gas LLC, a subsidiary of Enbridge Inc., under sections of the Natural Gas Act. The $1.1 billion project will provide up to 300,000 dekatherms per day (Dth/d) of firm transportation service and 95,000 Dth of Customized Delivery Service to TVA.
The pipeline expansion includes:
- 110 miles of 30-inch mainline and 4 miles of 30-inch header pipeline
- An 8-mile lateral pipeline
- Three new crossover pipelines
- A new compressor station in Trousdale County with 14,600 horsepower capacity
- Modifications to interconnects with other major pipelines (Texas Eastern, Columbia Gulf, and Midwestern Gas Transmission)
The infrastructure is critical to TVA’s plan to retire nine coal-fired units at its Kingston Plant by 2027 and replace them with a 1,500 MW natural-gas-fired plant, plus solar and battery storage systems.
East Tennessee signed a precedent agreement with TVA for 100% of the project’s capacity. The utility also proposed a new Customized Delivery Service feature to provide no-notice, flexible gas delivery up to 95,000 Dth/day, enabling rapid generation ramp-ups.
Pending regulatory approvals, the Ridgeline Expansion Project is on track to begin construction soon to meet TVA’s timeline.
The Author
Mary Holcomb is the Digital Editor & Operations Manager at Gulf Energy Information, overseeing the Pipeline & Gas Journal, World Oil, and Underground Infrastructure brands. With over 5 years of experience, she drives digital content strategy and operations for these industry-leading publications.
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