MountainWest Pipeline

Transporting clean natural gas throughout the Rockies

NEWS: Williams Closes Acquisition of MountainWest Natural Gas Transmission and Storage Business.

On February 14, 2023, Williams announced that it has closed its acquisition of MountainWest Pipelines Holding Company from Southwest Gas Holding, Inc.
Read more about the acquisition.
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MountainWest Pipeline is an interstate natural gas pipeline company that provides transportation and underground storage services in Utah, Wyoming and Colorado. We own and operate 1,867 miles of pipeline with total daily capacity of 2,530 Mdth. Our system is strategically located in the Rocky Mountains near large reserves of natural gas in six major producing areas, including the Greater Green River, Uinta and Piceance basins. We transport gas from these areas to other major pipeline systems for delivery to markets in the West and Midwest including the Dominion Energy UT local distribution system serving natural gas utility customers in Utah, southwest Wyoming and southern Idaho. We own and operate the Clay Basin storage facility located on the Wyoming-Utah border. Clay Basin is the largest underground storage reservoir in the Rocky Mountain Region.

Through wholly-owned subsidiaries, MountainWest Pipeline owns and operates the MountainWest Overthrust Pipeline in southwestern Wyoming. We also operate and own 50% of the White River Hub, LLC providing transportation and hub services through interconnections with six interstate pipeline systems and a major processing plant near Meeker, Colorado.