Questar's Businesses Retail Gas Distribution Questar Gas provides retail natural gas-distribution service to more than 1 million customers in Utah, southwestern Wyoming and southeastern Idaho. Questar Gas is regulated by public service commissions in Utah and Wyoming. Interstate Gas Transportation & Storage Questar Pipeline transports and stores natural gas. Questar's pipelines interconnect with major regional pipelines, and its system is strategically located to serve major gas-producing basins in the Rockies. Questar Pipeline owns and operates the Clay Basin storage facility, the largest underground-storage reservoir in the Rocky Mountain region. Gas Development and Production Wexpro develops and produces gas for affiliate Questar Gas under the terms of a long-standing agreement with the states of Utah and Wyoming. Dominion Questar Corporation and its integrated business are headquartered in Salt Lake City, Utah. Questar merged with Dominion Resources (NYSE: D) on Sept. 16, 2016.