QUESTAR CORPORATION
Questar Corporation is a natural gas-focused energy company with four major lines of business conducted through three principal subsidiaries — Questar Market Resources (gas and oil exploration, development and production; gas gathering and processing); Questar Pipeline (interstate gas transportation and storage); and Questar Gas (retail gas distribution).

QUESTAR MARKET RESOURCES
Questar Market Resources is the corporation's primary growth driver. Market Resources has four principal subsidiaries:

• Questar Exploration and Production (Questar E&P) acquires, explores for, develops and produces gas and oil in two core areas — the Rocky Mountain region of Wyoming, Utah and Colorado and the Midcontinent region of Oklahoma, Texas and Louisiana.
• Wexpro manages, develops and produces cost-of-service reserves for affiliated utility company Questar Gas.
• Questar Gas Management provides midstream field services, including gas gathering and processing, primarily in the Rockies.
• Questar Energy Trading sells Market Resources' equity and third-party gas and oil in the western U.S., provides risk-management services and owns and operates a natural gas storage facility in the Rockies.

QUESTAR PIPELINE
Questar Pipeline is an interstate pipeline company that transports natural gas in Utah, Wyoming and Colorado and owns and operates gas-storage facilities in Utah and Wyoming. Questar Pipeline is regulated by the Federal Energy Regulatory Commission. Questar Pipeline also owns and operates the Southern Trails Pipeline, which extends from the Four Corners area to the California state line, and the Questar Overthrust Pipeline in southwestern Wyoming.

QUESTAR GAS
Questar Gas provides retail gas-distribution service to more than 850,000 customers in Utah, southwestern Wyoming and a small portion of southeastern Idaho. Questar Gas is regulated by the Public Service Commission of Utah and the Wyoming Public Service Commission.