QUESTAR ANNOUNCES RECORD PRODUCTION, RESERVE TOTALS

SALT LAKE CITY — Questar Corp. (NYSE:STR) announced nonutility oil and gas production increased 17% to an all-time-high 76.6 billion cubic feet of gas equivalent (Bcfe) in 1999. This represents the fourth consecutive year of record production and the ninth increase in the last 10 years.

A subsidiary, Questar Exploration and Production Co. (QEP), replaced 131% of production in 1999 through reserve additions, revisions and acquisitions amounting to 134.1 Bcfe. The production and reserve totals were reduced by the fourth-quarter sale of nonstrategic properties and approximately 34 Bcfe of oil and gas reserves in the Permian Basin and Kansas.

Questar estimated that nonutility oil and gas reserves totaled 597.6 Bcfe on Dec. 31, 1999, a 4% year-to-year increase. The reserve total does not include nonutility oil owned by another Questar affiliate, Wexpro Co.

The prospective first-quarter 2000 amortization rate for QEP's U.S. operations is $.80 per thousand cubic feet equivalent (Mcfe) compared with a first-quarter 1999 rate of $.85 per Mcfe. The Canadian amortization rate for first-quarter 2000 is $.74 (U.S.) per Mcfe.

Questar officials said the monthly production rate increased from 6.2 Bcfe in December 1998 to 6.7 Bcfe in December 1999, after adjusting for sold properties.

Gas reserves make up approximately 86 percent of QEP's total nonutility oil and gas reserves, with proved undeveloped reserves accounting for 15 percent of the record total.

Approximately 94% of the companies' reserves are in the U.S., primarily the Midcontinent (56%) and Rocky Mountains (38%). The remaining reserves are primarily in the Canadian provinces of Alberta and British Columbia. These reserve totals do not include the recently announced acquisition of 61 Bcfe of reserves in western Canada.

Questar is a $2.2 billion integrated energy resources and services 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.