Questar Gas provides retail natural gas-distribution service to more than 800,000 customers in Utah, southwestern Wyoming and a small portion of southeastern Idaho. The company is regulated by the Public Service Commission of Utah and the Wyoming Public Service Commission. More than 40 percent of the natural gas sold to Questar Gas retail customers comes from utility-owned supplies that are typically much less expensive than gas purchased on the open market. Questar Gas is also one of the most efficient natural gas utilities in the nation as measured by the ratio of customers to employees. As a result, rates paid by its customers are traditionally among the lowest in the country. A Questar Gas predecessor began serving customers in 1929. In the decades that have elapsed since that time, it has never had a major service interruption.