July 17, 2001
NYSE:STR

Contact: R. Curtis Burnett
Business: (801) 324-5647

QUESTAR EARNINGS TELECONFERENCE/WEB CAST
SCHEDULED FOR TUESDAY, JULY 31

SALT LAKE CITY — Questar Corp. (NYSE:STR) will hold an analyst conference call and Web Cast to review financial results for second-quarter 2001 and management's outlook for 2001. The call will be held Tuesday, July 31, 2001, at 9:30 a.m. Eastern Time, 7:30 a.m. Mountain Time.

Don Cash, Questar chairman and CEO, Stephen E. Parks, chief financial officer, and Keith O. Rattie, Questar president and COO, will speak during the conference call.

The call will be available live in a listen-only mode via telephone or the Internet. To listen via telephone, dial 1-212-346-7467 five to ten minutes prior to the teleconference. The Internet site is www.questar.com.

A telephone replay of the teleconference will be available at 1-800-633-8284, #19171185, through August 7. The presentation also will be available on the Questar site under Financial Information/Audio Archives.

Questar is a $2.5 billion diversified natural gas company headquartered in Salt Lake City. Through subsidiaries, it engages in energy development and production; gas gathering and processing; wholesale gas, electricity and liquids trading; retail energy services; interstate gas transmission and storage; retail gas distribution; and information systems and technologies.

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