On July 1, 2026, MountainWest Overthrust Pipeline, LLC (Overthrust) ( printed page 67832) filed an application in Docket No. CP26-550-000 requesting a Certificate of Public Convenience and Necessity pursuant to Section 7(c) of the Natural Gas Act to construct and operate certain natural gas pipeline facilities. The proposed project is known as the Green River West Expansion Project (Project), and it would allow the delivery of up to 64,000 dekatherms per day of firm natural gas transportation service from receipt points near Opal, Wyoming, to the new WE Soda delivery meter station in Sweetwater County, Wyoming.

On July 15, 2026, the Federal Energy Regulatory Commission (Commission or FERC) issued its Notice of Application for the Project. Among other things, that notice alerted agencies issuing federal authorizations of the requirement to complete all necessary reviews and to reach a final decision on a request for a federal authorization within 90 days of the date of issuance of the Commission staff's environmental document for the Project.

This notice identifies Commission staff's intention to prepare an environmental assessment (EA) for the Project and the planned schedule for the completion of the environmental review.^[1]

Schedule for Environmental Review

Issuance of EA February 5, 2027

90-day Federal Authorization Decision Deadline ^[2] May 6, 2027

If a schedule change becomes necessary, additional notice will be provided so that the relevant agencies are kept informed of the Project's progress.

Project Description

Overthrust proposes to construct, own, operate, and maintain the following facilities in Sweetwater County, Wyoming: two new 12-inch-diameter delivery taps on Overthrust's existing ML116 and ML133 mainline pipelines; a 6.78-mile-long, 12-inch-diameter tap line (JTL150), extending north from the new taps to WE Soda's Westvaco Trona Processing Plant; and a new meter and regulator station (JTL150 Meter Station) at the existing Westvaco Plant site. The Project would also involve construction of new permanent access roads, use of existing access roads, and use of temporary workspaces during construction.

Background

On September 1, 2026, the Commission issued a Notice of Scoping Period Requesting Comments on Environmental Issues for the Proposed Green River West Expansion Project (Notice of Scoping). The Notice of Scoping was sent to federal, state, and local government representatives and agencies; elected officials; Native American Tribes; environmental and public interest groups; other interested parties; and local libraries and media outlets. In response to the Notice of Scoping, the Commission received comments from the Wyoming Department of Environmental Quality, Water Quality Division and the U.S. Bureau of Land Management, Kemmerer Field Office. The primary issues raised to date are the identification of surface waters of the state in proximity to the Project, their designated uses, and compliance with Wyoming water quality permitting requirements; and effects on wildlife and special status species, vegetation and soils, cultural, paleontological, and land resources on BLM-administered public lands. A letter of support for the project was also filed by the Sweetwater County Board of County Commissioners. All substantive comments will be addressed in the EA.

The U.S. Bureau of Land Management, Kemmerer Field Office is a cooperating agency in the preparation of the EA.

Additional Information

In order to receive notification of the issuance of the EA and to keep track of formal issuances and submittals in specific dockets, the Commission offers a free service called eSubscription. This service provides automatic notification of filings made to subscribed dockets, document summaries, and direct links to the documents. Go to www.ferc.gov/​ferc-online/​overview to register for eSubscription.

For public inquiries and assistance with making filings such as interventions, comments, or requests for rehearing, contact the Office of Public Participation at (202) 502-6595 or OPP@ferc.gov.

Additional information about the Project is available from the FERC website ( www.ferc.gov). Using the “eLibrary” link, select “General Search” from the eLibrary menu, enter the selected date range and “Docket Number” excluding the last three digits ( i.e., CP26-550), and follow the instructions. For assistance with access to eLibrary, the helpline can be reached at (866) 208-3676, TTY (202) 502-8659, or at FERCOnlineSupport@ferc.gov. The eLibrary link on the FERC website also provides access to the texts of formal documents issued by the Commission, such as orders, notices, and rule makings.

(Authority: 18 CFR 2.1)