 LAS VEGAS, Oct. 5, 2021 PRNewswire -- Southwest Gas Holdings, Inc. NYSE: SWX announced today that it has entered into a definitive agreement to acquire Dominion Energy Questar Pipeline, LLC, its subsidiaries and certain associated affiliates, including Overthrust Pipeline, White River Hub and Questar Field Services Questar Pipelines from Dominion Energy, Inc. NYSE: D. Questar Pipelines is an essential Rocky Mountain energy hub with 2,160-miles of highly contracted, FERC-regulated interstate natural gas pipelines providing transportation and underground storage services in Utah, Wyoming and Colorado. 