MountainWest Pipeline, a medium-sized 1,867-mile pipeline located in the Rocky Mountains, serves key natural gas reserves in the Greater Green River, Uinta, and Piceance basins. Owned by The Williams Companies, Inc. and operated by MountainWest Pipelines Holding Company, it operates at more than 50% utilization, serving utility/power and producers sectors. Major clients include Questar Gas Company, Pacificorp, and Concord Energy LLC.