Questar Corporation specializes in gas-focused energy through its three principal subsidiaries: Questar Market Resources, Questar Pipeline and Questar Gas. Questar Market Resources is a company that specializes in gas and oil exploration, development and production, as well as gas gathering and processing. Questar Pipeline focuses on interstate gas transportation and storage. Questar Gas is a retail gas distribution operation. At the close of 2005, Questar Corporation had an estimated value of nearly $7 billion, including net income that exceeded $325 million. The company finds, develops, produces, gathers, processes, trasports, stores and distributes natural gas. Questar Corporation maintains operations in Salt Lake City.