Questar Corporation
Former Salt Lake City-based natural-gas utility and energy holding company whose businesses were ultimately acquired by Dominion Resources and Enbridge.
Last updated August 26, 2026
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Overview
Questar Corporation was a Utah-based energy holding company best known for natural-gas distribution, interstate pipeline operations, and hydrocarbon exploration and production in the western United States. Although the Questar name was created in 1984, its operating history extended back to the formation of Western Public Service Corporation in 1928 and to the development of Mountain Fuel Supply Company as that group’s exploration and production affiliate. The company’s early utility business grew around natural-gas discoveries in Wyoming and a distribution network serving Utah communities, including Salt Lake City, Ogden, and Provo. Questar’s historical development reflected the changing structure of the American natural-gas industry. Its predecessor businesses built a long-distance pipeline from the Uintah Basin area in 1929 and combined gas distribution, pipeline transportation, and exploration and production. The company endured the collapse in demand and share value associated with the Great Depression, wartime restrictions on new utility connections, and repeated debates over whether it should be managed primarily as a regulated gas utility or as an oil and gas producer. Its producing activities expanded through discoveries at Clay Basin, Church Buttes, and Brady, while its regulated distribution operations remained centered in Utah and adjacent western markets. In 1935, shareholders reorganized the predecessor company and moved its headquarters from Pittsburgh to Salt Lake City, with Mountain Fuel Supply Company becoming the consolidated operating company. Over subsequent decades, the business diversified beyond gas. It acquired Interstate Brick in 1971, established telecommunications and alternative-fueling ventures in the late 1980s, and bought additional oil and gas reserves in Oklahoma and elsewhere. By the early 1990s, the company had three principal operating areas: exploration and production, interstate transmission, and retail gas distribution. Questar Corporation became the parent holding company in 1984. Mountain Fuel Supply Company was renamed Questar Gas Company in 1998, aligning the customer-facing utility with the corporate brand. The company continued to acquire energy assets, including HSRTW and Shenandoah Energy, while also disposing of noncore activities. Questar Telecom was sold to Nextel Communications in 1994, and the data-center subsidiary Consonus was sold in 2005. The company’s later history was shaped by separation and consolidation. In 2010, Questar spun off its exploration and production operations as QEP Resources, leaving a more focused gas-utility and midstream organization. In 2015, Tesoro Logistics acquired Questar’s natural-gas pipeline and processing operations. Dominion Resources acquired Questar in 2016, bringing Questar Gas into Dominion’s regulated utility portfolio. In 2024, Enbridge completed its acquisition of Questar Gas for a reported $4.3 billion. Following that transaction, Questar ceased to exist as an independent corporate energy group, while the Questar Gas utility business became part of Enbridge’s gas-utility operations.
History
Questar’s roots lay in the development of natural-gas resources and utility infrastructure in Utah and Wyoming. In 1922, the Ohio Oil Company discovered gas near Rock Springs, Wyoming. Ohio Oil later joined Prairie Oil & Gas and the Crawford interests of Pittsburgh in creating Western Public Service Corporation, incorporated on October 6, 1928. Mountain Fuel Supply Company served as the group’s hydrocarbon exploration and production affiliate. The predecessor organization moved quickly to establish transportation and distribution infrastructure. Construction of the 380-mile Uintah Pipe Line began on March 3, 1929, and was completed later that year. The line reportedly cost $24 million and had capacity of approximately 60 million cubic feet per day. Distribution was conducted through subsidiaries including Ogden Gas Company, Utah Gas & Coke Company in Salt Lake City, and Wasatch Gas Company, which was organized in 1929 to serve much of the remaining territory. Utah Valley Gas & Coke of Provo was acquired in 1931, although the area did not receive natural gas service until 1948 because surplus coal gas remained available. The Great Depression severely affected the business. As households struggled to pay for fuel, the company’s share price declined sharply between 1929 and 1932. In 1935, shareholders approved a reorganization that merged the company with its subsidiaries and moved the headquarters from Pittsburgh to Salt Lake City. Mountain Fuel Supply Company became the name of the reorganized consolidated company. Exploration success strengthened the company’s resource base. Natural gas was discovered in the Clay Basin region of northeastern Utah during the mid-1930s, followed by the Church Buttes field in southwestern Wyoming in 1946 and the Brady field southeast of Wyoming in 1972. During World War II, the War Production Board required the company to stop accepting new natural-gas utility customers so that resources could be conserved for wartime purposes. Mountain Fuel also experimented with diversification. It acquired Interstate Brick, described as the largest brick-making facility in the western United States, in 1971 and sold the business in 1990. In 1976, some shareholders sought to replace management in a dispute over whether the company should recognize that its economic profile had become more closely tied to oil production than to regulated gas distribution. In 1984, shareholders approved a return to a holding-company structure and selected Questar Corporation as the new parent name. The company created Questar Telecom in 1989 to acquire specialized mobile-radio operations and formed FuelMaker, a joint venture intended to market equipment allowing natural-gas vehicles to be refueled at home. By 1993, its activities were organized into exploration and production businesses, interstate transmission through Questar Pipeline Company, and retail distribution through Mountain Fuel. Questar expanded and restructured during the 1990s and early 2000s. It acquired oil and gas properties from Union Pacific Resources in 1994 and sold Questar Telecom to Nextel Communications later that year. On January 1, 1998, Mountain Fuel Supply Company was renamed Questar Gas Company. Questar acquired HSRTW, which held Oklahoma oil and gas reserves, in 1998, and bought Shenandoah Energy in 2001 for cash and assumed debt. Chief executive D. N. “Nick” Rose retired in 2003 and was succeeded by Alan K. Allred. Questar’s S&P 500 membership began in 2006 and ended in 2010. The company then concentrated on utility and midstream activities. On July 1, 2010, it spun off its exploration and production business as QEP Resources. In 2012, Questar moved into a new six-story headquarters at 333 South State Street in downtown Salt Lake City. The building was described as a $45 million, 170,000-square-foot project and among the first LEED Silver energy-efficient buildings in downtown Salt Lake City. In December 2015, Tesoro Logistics acquired Questar’s natural-gas pipeline and processing business for cash, further narrowing the company’s operating scope. Dominion Resources acquired Questar in September 2016. The transaction integrated Questar Gas into Dominion’s utility operations. Dominion later agreed to sell Questar Gas to Enbridge, and Enbridge completed the acquisition in June 2024 for a reported $4.3 billion. Questar Corporation is therefore a defunct independent company, while the Questar Gas operating business continues under Enbridge ownership.
- 2024
Enbridge acquisition completed
[1]Enbridge completed its purchase of Questar Gas, ending Questar’s existence as an independent company.
- 2016
Acquired by Dominion Resources
[1]Dominion Resources acquired Questar and integrated its gas utility into the Dominion system.
- 2015
Pipeline and processing business sold
[1]Tesoro Logistics acquired Questar’s natural-gas pipeline and processing operations.
- 2012
New Salt Lake City headquarters opened
[1]Questar moved to a new energy-efficient headquarters at 333 South State Street.
- 2010
QEP Resources spun off
[1]Questar separated its exploration and production business as QEP Resources.
- 1998
Mountain Fuel renamed Questar Gas
[1]The principal retail utility subsidiary adopted the Questar Gas name.
- 1989
Questar Telecom and FuelMaker established
[1]The company entered specialized mobile radio and residential natural-gas vehicle refueling through new ventures.
- 1984
Questar Corporation created
[1]Shareholders approved a holding-company structure and adopted Questar Corporation as the parent name.
- 1971
Interstate Brick acquired
[1]Mountain Fuel diversified into brick manufacturing by acquiring Interstate Brick.
- 1946
Church Buttes field discovered
[1]The company discovered the Church Buttes natural-gas field in southwestern Wyoming.
Products and positioning
A regional western U.S. natural-gas utility and integrated energy company combining regulated distribution with pipeline, processing, and exploration and production assets.
Natural-gas utility · 1998
Questar Gas
Questar Gas was the company’s retail natural-gas distribution business, serving residential, commercial, and other utility customers primarily in Utah and nearby western markets. The business originated as Mountain Fuel Supply Company and adopted the Questar Gas name in 1998. It became the principal surviving operating business after the upstream and pipeline businesses were separated or sold, and it was acquired by Dominion Resources in 2016 and Enbridge in 2024.
Interstate natural-gas transmission
Questar Pipeline
Questar Pipeline represented the company’s interstate transmission activities. It connected western natural-gas production and storage resources with utility and commercial markets and formed one of Questar’s three principal business lines during the 1990s. The pipeline and associated processing operations were sold to Tesoro Logistics in 2015.
Oil and natural-gas exploration and production
Wexpro and related upstream operations
Questar conducted exploration and production through Wexpro Company, Celsius Energy Company, Universal Resources Corporation, and other affiliated operations. These businesses developed gas and oil reserves in the Rocky Mountain region and elsewhere. Questar separated the upstream portfolio in 2010 through the creation of QEP Resources.
Alternative-fuel equipment · 1989
Natural-gas vehicle refueling equipment
Through FuelMaker, a joint venture established in 1989, Questar participated in efforts to commercialize equipment that would allow natural-gas vehicles to be refueled at home. The initiative reflected the company’s interest in expanding natural gas beyond conventional utility consumption.
Brand decisions
2024
Enbridge acquisition of Questar GasM&ABackground
After Questar had operated within Dominion, Enbridge pursued the acquisition of the Questar Gas utility business as part of its gas-utility portfolio expansion.
Action taken
Enbridge completed the acquisition in June 2024 for a reported $4.3 billion.
Aftermath
Questar Gas became part of Enbridge, and Questar Corporation remained only as a historical corporate identity.
Acquisition value. $4.3 billion (June 2024)
2016
Acquisition by Dominion ResourcesM&ABackground
Questar had become increasingly focused on its gas-utility operations following the upstream spin-off and pipeline sale.
Action taken
Dominion Resources acquired Questar Corporation and incorporated Questar Gas into its utility portfolio.
Aftermath
Questar no longer operated as an independent public energy company, although the Questar Gas brand and utility business continued.
2015
Sale of pipeline and processing operationsM&ABackground
Questar continued to streamline its portfolio after separating the upstream business.
Action taken
Tesoro Logistics acquired Questar’s natural-gas pipeline and processing business for $2.5 billion in cash.
Aftermath
The sale further concentrated Questar on its regulated gas-utility activities before the Dominion acquisition.
Transaction value. $2.5 billion cash (2015)
2010
Spin-off of exploration and productionStrategyBackground
Questar operated both a regulated gas utility and upstream oil and gas businesses, exposing the parent to different capital requirements and risk profiles.
Action taken
On July 1, Questar completed the corporate spin-off of its exploration and production business as QEP Resources.
Aftermath
Questar became more focused on gas distribution and related midstream operations, while QEP Resources operated independently until its later acquisition by Diamondback Energy in 2021.
1984
Return to a holding-company structureStrategyBackground
Mountain Fuel Supply Company’s shareholders approved a corporate reorganization after decades of operating as a consolidated energy company with utility and exploration activities.
Action taken
The shareholders created a new parent holding company named Questar Corporation.
Aftermath
The Questar name became the corporate identity for a group spanning gas distribution, pipelines, and exploration and production.
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