Ridgeline Expansion Project

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Sources disagree on some of this page's facts. Each value is shown with its sources; see Sources disagree.

Ridgeline Expansion Project is a natural gas pipeline expansion in Tennessee, operated by East Tennessee Natural Gas, LLC. Construction began in 2025.

Ridgeline Expansion Project
General information
KindPipeline project[1]
Project typeExpansion[1][2]
StatusUnder construction[2][3]
CommodityNatural gas[2][4]
Owner and operator
Operator
Facility project
StateTennessee[2][5]
CountiesFentress, Jackson, Morgan, Overton, Putnam, Roane, Smith, Trousdale[6]
Approved2 April 2025[4][5]
Construction startedOctober 2025[7][8]
FERC docketCP23-516[1]
FERC pre-filing docketPF22-7[1]
Contractors
Technical information
Length122 mi[5] or 122.2 mi[2][6][sources disagree]
Pipe size30"[2][4][8]
Capacity395 MMcf/d (FERC project list)[5] or 300 MMcf/d additional capacity (EIA)[2][sources disagree]
Cost$1105 million (EIA estimate; no dollar year given)[2] or US$1.4 billion estimated capital cost[9][sources disagree]
On ProvenHand
Hands listed0

Ridgeline Expansion Project is a natural gas pipeline expansion in Tennessee, operated by East Tennessee Natural Gas, LLC. Construction began in 2025.

Contractorsedit

ContractorWorkScopeSpread
Michels Trenchless, Inc.[10]HDD and boreHDD contractor selected for the Cumberland River crossing; Cumberland River
J. D. Hair & Associates, Inc.[10]HDD design engineerHDD design review for the Cumberland River crossing
WSP USA Inc.[11]Blasting plan consultantSpecifies controlled blasting requirements and reviews the blasting contractor's site-specific plans
Michels Pipeline, Inc.[12]PrimePipe work on the 122.2 miles of 30-inch (union job notification, Sept 2025)
Michels Trenchless, Inc.[13]HDD and boreSix HDDs, possibly more, on the 30-inch pipe (union job notification, Sept 2025)
Michels Trenchless, Inc.[14]Compressor station, M&R and crossover workCompressor station, M&R facilities and crossovers in Trousdale, Jackson, Fentress, Morgan and Roane Counties (union job notification, Sept 2025)
Northern Clearing, Inc.[15]Clearing and reclamation62 miles of land clearing, matting and fencing on Spread 2 (union job notification, Sept 2025)Spread 2
WHM Construction, Inc.[16]Clearing and reclamationClearing, matting and fencing in Smith, Putnam, Overton, Fentress, Morgan and Roane Counties, start Dec 2025 (union job notification, Nov 2025)

Spreads

SpreadDates
Spread 1[3][7]from 1 October 2025
Spread 2[3][15][17]from 1 October 2025

Crossings

FeatureMethodContractor
Cumberland River[10][18]HDDMichels Trenchless, Inc.
Emory River[18]HDD
Harriman Highway[18]HDD
Little Goose Creek and Big Goose Creek[19]HDD
Norfolk Southern Railroad at Lancing[20]HDD
Second Creek[19]HDD

Sources disagree

These sources give different values for the same fact. Each value is listed with the sources that give it.

FactValues given
Capacity
  • 395 MMcf/d (FERC project list)[5]
  • 300 MMcf/d additional capacity (EIA)[2]
Cost
  • $1105 million (EIA estimate; no dollar year given)[2]
  • US$1.4 billion estimated capital cost[9]
Length

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Referencesedit

  1. “FERC eLibrary docket CP23-516”. Federal Energy Regulatory Commission. 18 July 2023. Retrieved 3 October 2026.
  2. “U.S. natural gas pipeline projects (Natural Gas Pipeline Projects)”. U.S. Energy Information Administration. Retrieved 3 October 2026.
  3. “Bi-Weekly Status Report No. 30 (Aug 8 to Aug 21, 2026), Ridgeline Expansion Project (CP23-516)”. East Tennessee Natural Gas, LLC (filed with FERC). 4 September 2026. Retrieved 3 October 2026.
  4. “Order Issuing Certificate, East Tennessee Natural Gas, LLC (191 FERC 61,004), Ridgeline Expansion Project”. FERC. 2 April 2025. Retrieved 3 October 2026.
  5. “FERC: Approved Major Pipeline Projects (1997-Present)”. Federal Energy Regulatory Commission. Archived from the original on 1 July 2025. Retrieved 3 October 2026.
  6. “Environmental Compliance Monitoring Program weekly summary (Oct 23 to Nov 1, 2025), Ridgeline Expansion Project”. FERC. 17 November 2025. Retrieved 3 October 2026.
  7. “Bi-Weekly Status Report No. 9 (Oct 18 to Oct 31, 2025), Ridgeline Expansion Project (CP23-516)”. East Tennessee Natural Gas, LLC (filed with FERC). 7 November 2025. Retrieved 3 October 2026.
  8. “Ridgeline Expansion Project (project page)”. Enbridge Inc. Retrieved 3 October 2026.
  9. “Enbridge Inc. Form 10-Q for the quarter ended June 30, 2026 (growth projects table)”. Enbridge Inc. (filed with the SEC). 31 July 2026. Retrieved 3 October 2026.
  10. “Implementation Plan supplement (Condition 13, Cumberland River HDD), Ridgeline Expansion Project (CP23-516)”. East Tennessee Natural Gas, LLC (filed with FERC). 29 July 2025. Retrieved 3 October 2026.
  11. “Implementation Plan supplement (Revised Controlled Blasting Plan), Ridgeline Expansion Project (CP23-516)”. East Tennessee Natural Gas, LLC (filed with FERC). 2 October 2025. Retrieved 3 October 2026.
  12. “Job notification: Michels Pipeline, Ridgeline Expansion (Enbridge), Tennessee”. Teamsters National Pipeline (union job notification database). 26 September 2025. Retrieved 3 October 2026.
  13. “Job notification: Michels Trenchless, Ridgeline Expansion (Enbridge), six HDDs”. Teamsters National Pipeline (union job notification database). 26 September 2025. Retrieved 3 October 2026.
  14. “Job notification: Michels Trenchless, Ridgeline Expansion (Enbridge), compressor station, M&R facilities and crossovers”. Teamsters National Pipeline (union job notification database). 26 September 2025. Retrieved 3 October 2026.
  15. “Job notification: Northern Clearing Inc., Enbridge Ridgeline Spread 2, 62 miles of clearing”. Teamsters National Pipeline (union job notification database). 30 September 2025. Retrieved 3 October 2026.
  16. “Job notification: WHM Construction, Inc., Ridgeline Expansion (Enbridge), clearing, matting and fencing”. Teamsters National Pipeline (union job notification database). 6 November 2025. Retrieved 3 October 2026.
  17. “Bi-Weekly Status Report No. 11 (Nov 15 to Nov 28, 2025), Ridgeline Expansion Project (CP23-516)”. East Tennessee Natural Gas, LLC (filed with FERC). 5 December 2025. Retrieved 3 October 2026.
  18. “Bi-Weekly Status Report (period ending March 2026), Ridgeline Expansion Project (CP23-516)”. East Tennessee Natural Gas, LLC (filed with FERC). 16 March 2026. Retrieved 3 October 2026.
  19. “Bi-Weekly Status Report No. 12 (Nov 29 to Dec 12, 2025), Ridgeline Expansion Project (CP23-516)”. East Tennessee Natural Gas, LLC (filed with FERC). 22 December 2025. Retrieved 3 October 2026.
  20. “Bi-Weekly Status Report No. 26, Ridgeline Expansion Project (CP23-516)”. East Tennessee Natural Gas, LLC (filed with FERC). 10 July 2026. Retrieved 3 October 2026.

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This page was last edited on 09:25, 4 October 2026 (UTC). Version 1.

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