MDU Resources
MDU Resources is a U.S. corporation focused on regulated energy delivery and construction materials and services.
Last updated October 30, 2026
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Overview
MDU Resources is a Bismarck, North Dakota–based American corporation whose businesses center on regulated energy delivery and infrastructure-related construction materials and services. The company traces its origins to 1924, when Rolland Heskett organized the Minnesota Northern Power Company. Its early holdings included electric utilities in Minnesota, Montana, and Oklahoma, although several of those initial properties were subsequently sold or spun off. The remaining eastern Montana operations became the foundation of the utility system that later developed into Montana-Dakota Utilities. The business expanded from electricity into natural gas after oil was discovered in the Williston Basin in 1936. During the following decades, it enlarged its utility territory across eastern Montana and western North Dakota, including the 1945 purchase of Dakota Public Service Company. That transaction substantially increased the number of communities served by the company, although it also led to a lengthy dispute with the seller concerning alleged internal charges in the acquired utility's historical accounts. The litigation continued for approximately six years before both sides abandoned it. The company's corporate identity changed as its operations developed. The Minnesota Northern subsidiaries were reorganized under the Montana-Dakota Utilities name after the passage of the Public Utility Holding Company Act of 1935. The company's common stock began trading on the New York Stock Exchange in 1948 under the symbol MDU. Its headquarters moved to Bismarck in 1968, placing the corporate center within the utility service territory. In 1985, the corporation adopted the name MDU Resources Group, Inc., reflecting a broader portfolio than its original electric and gas operations. MDU Resources later diversified beyond regulated utilities. It entered the construction materials industry in 1992 through the acquisition of an aggregates-mining company in central California. That business grew into Knife River Corporation, a major U.S. producer and supplier of aggregates, asphalt, cement, ready-mix concrete, and related construction services. MDU Resources also established a utility services division in 1997, which expanded into engineering, construction, and infrastructure work and became known as MDU Construction Services Group. The portfolio was subsequently adjusted through separations and rebranding. Knife River was spun off in 2023 as an independent public company. In 2024, the construction services business was renamed Everus Construction Group in preparation for a planned tax-free spinoff. These changes left MDU Resources more focused on regulated energy delivery while separating the main construction materials and construction services businesses into distinct corporate platforms. MDU Resources operates in 48 U.S. states through its utility, construction, and materials businesses. Its principal utility subsidiaries include Montana-Dakota Utilities, Cascade Natural Gas, and Intermountain Gas. Cascade Natural Gas, serving parts of Oregon and Washington, was acquired in 2006; Intermountain Gas, serving Idaho, was acquired in 2008. The company has also participated in regional generation projects, including the Big Stone and Coyote plants. Its history combines regulated electric and natural gas distribution with a long-term strategy of adding complementary infrastructure businesses and then periodically separating them when management believes independent ownership is more appropriate.
History
MDU Resources began in 1924 as Minnesota Northern Power Company under the leadership of Rolland Heskett, a utility executive with prior connections to power businesses in Wisconsin and northeastern Minnesota. Its original holdings included electric systems in Cushing, Oklahoma; the Bemidji area of Minnesota; and several communities in eastern Montana. The Oklahoma property was soon transferred to Oklahoma Gas & Electric, and the Minnesota system was sold to interests associated with W. B. Foshay in 1925. The eastern Montana properties remained central to the company's later development. In 1926, Minnesota Northern acquired United Power Company of Crosby, North Dakota, which served communities around Kenmare and elsewhere in the region. The relevant businesses were operated under the Montana-Dakota Power Company name. The company entered the natural-gas industry after oil discoveries in the Williston Basin in 1936 and expanded its electric and gas footprint through eastern Montana and western North Dakota. Following the 1935 Public Utility Holding Company Act, Heskett reorganized the gas and electric subsidiaries under the Montana-Dakota Utilities name. The company generally emphasized retail utility distribution rather than wholesale energy resales. During the early 1940s, it acquired distribution systems serving five eastern Montana towns that had previously been associated with Mountain States Power Company. In 1945, it made its largest early expansion of electric territory by buying Dakota Public Service Company from NorthWestern Public Service Company. The acquired system served 91 towns across western and central North Dakota and into north-central South Dakota. A dispute over alleged internal accounting charges led to roughly six years of litigation between the companies. The parties eventually ended the case and redirected attention toward system expansion and reliability improvements. MDU's common stock began trading on the New York Stock Exchange in 1948 under the symbol MDU. During the 1960s, management decided to locate the headquarters within the utility's operating territory. The move to Bismarck, North Dakota, was completed in 1968. MDU also participated with neighboring utilities in developing regional baseload generation, including the Big Stone plant near Big Stone City, South Dakota, and the Coyote plant. The corporation adopted the name MDU Resources Group, Inc. in 1985 as it broadened beyond its historic utility identity. Diversification accelerated in 1992, when the company acquired its first aggregates-mining business in central California. The resulting construction materials platform expanded over time and became Knife River Corporation, which grew into a major U.S. supplier of aggregates and related products. MDU Resources sold its remaining coal-mining interests in 2001. The company established a utility services division in 1997. Over time, that operation added construction, engineering, and infrastructure capabilities and became MDU Construction Services Group. MDU also expanded its regulated natural-gas presence through the acquisitions of Cascade Natural Gas Corporation in 2006 and Intermountain Gas Company in 2008. Cascade served portions of Oregon and Washington, while Intermountain served Idaho. MDU Resources later began separating its diversified businesses. Knife River was spun off in 2023 as an independent public company with operations in construction materials and contracting across 17 states. In 2024, MDU Construction Services Group was renamed Everus Construction Group in preparation for a planned tax-free spinoff. The changes marked a shift toward a more focused regulated-energy company while preserving a long historical connection to construction and infrastructure markets.
- 2024
MDU Construction Services Group is renamed Everus
[1]The construction services business adopts the Everus Construction Group name ahead of a planned spinoff.
- 2023
Knife River is spun off
[1]The construction materials and contracting platform becomes a separate publicly traded company.
- 2008
Intermountain Gas is acquired
[1]The acquisition expands MDU Resources' regulated gas business into Idaho.
- 2006
Cascade Natural Gas is acquired
[1]The acquisition adds regulated natural-gas operations in parts of Oregon and Washington.
- 2001
Remaining coal interests are sold
[1]Knife River divests MDU Resources' remaining coal-mining interests.
- 1997
Utility services division is established
[1]The company creates a utility services business that later develops into MDU Construction Services Group.
- 1992
Construction materials diversification begins
[1]MDU Resources acquires its first aggregates-mining company in central California.
- 1985
Corporate name changes to MDU Resources Group
[1]The corporation adopts the MDU Resources Group name to reflect its broader business portfolio.
- 1968
Headquarters move to Bismarck
[1]The corporate headquarters relocation to Bismarck, North Dakota, is completed.
- 1948
Stock begins trading on the New York Stock Exchange
[1]The company's common stock starts trading under the ticker symbol MDU.
Products and positioning
A diversified U.S. energy and infrastructure company historically combining regulated electric and natural gas utilities with construction materials and construction services. Following the 2023 Knife River separation and the planned separation of Everus Construction Group, MDU Resources has been repositioning around its regulated energy-delivery businesses.
Electricity distribution · 1924
Regulated electric utility service
MDU Resources' historic core is the regulated generation, transmission, and distribution of electricity to communities in the northern Great Plains and surrounding service areas. Its utility operations developed from eastern Montana and western North Dakota systems and later expanded through acquisitions and regional generation partnerships.
Natural gas distribution · 1936
Regulated natural gas service
The company entered natural gas after Williston Basin oil discoveries in the 1930s. Its gas portfolio has included Montana-Dakota Utilities, Cascade Natural Gas in Oregon and Washington, and Intermountain Gas in Idaho, providing regulated distribution service to residential, commercial, and other customers.
Construction materials · 1992
Knife River construction materials
Knife River developed from MDU Resources' aggregates investments and supplied aggregates, asphalt, cement, ready-mix concrete, liquid asphalt, building materials, and related contracting services. The business was separated from MDU Resources in 2023 and is no longer an MDU Resources operating line.
Utility and infrastructure construction · 1997
Everus Construction Group
The construction services operation grew from a utility services division established in 1997. It provides construction and infrastructure capabilities associated with utility and energy projects. In 2024, MDU Resources renamed the business Everus Construction Group in preparation for a planned tax-free separation.
Controversies
2019
Additional Portland explosion lawsuits
Two further lawsuits against Loy Clark were filed in December 2019 in connection with the Portland incident.
2018
Loy Clark litigation following the explosion
Ten lawsuits were filed against Loy Clark in November 2018, including two brought by insurers seeking recovery for claims they had paid.
2016
Portland gas explosion involving Loy Clark
A gas explosion in Portland, Oregon, involving MDU Resources subsidiary Loy Clark destroyed a building, damaged nearby properties, dispersed asbestos fragments, and injured eight people. The Oregon Public Utility Commission faulted Loy Clark for failing to provide regulators with sufficient notice of excavation plans. OSHA also cited and fined the company for safety violations.
Brand decisions
2024
Rebrand construction services business as EverusStrategyBackground
MDU Resources prepared to separate its construction services business from the parent company.
Action taken
MDU Construction Services Group, Inc. was renamed Everus Construction Group, Inc.
Aftermath
The rebranding established a distinct identity for the construction services platform ahead of a planned tax-free spinoff.
2023
Separate Knife River CorporationM&ABackground
MDU Resources was restructuring its portfolio and separating the construction materials business from regulated energy operations.
Action taken
Knife River was spun off into a separate publicly traded company.
Aftermath
MDU Resources became more concentrated on regulated energy delivery, while Knife River continued independently in construction materials and contracting.
1997
Create utility services divisionStrategyBackground
The company aimed to develop construction and service capabilities related to utility infrastructure.
Action taken
MDU Resources established a utility services division that later became MDU Construction Services Group.
Aftermath
The division broadened into construction and infrastructure services and was later renamed Everus Construction Group.
1992
Enter construction materials through aggregates acquisitionStrategyBackground
MDU Resources sought businesses complementary to its utility operations and less dependent on regulated energy delivery.
Action taken
The corporation acquired its first aggregates-mining company in central California.
Aftermath
The activity expanded into Knife River, a major construction materials and contracting platform that was later spun off.
1945
Acquire Dakota Public Service CompanyM&ABackground
MDU sought to expand its regulated electric territory in North Dakota and South Dakota.
Action taken
The company purchased Dakota Public Service Company from NorthWestern Public Service Company, adding service to 91 towns.
Aftermath
The acquisition led to a prolonged accounting-related lawsuit, but ultimately enlarged MDU's operating territory and became a major part of its utility system.
Recent events
MDU Resources adjusts 2021 guidance[2]
Reported:
MDU Resources announced that it was adjusting its revenue, margin and earnings-per-share guidance for the year; it anticipated earnings per share of $1.90 to $2.05.
MDU Resources reports first-quarter earnings[3]
Reported:
MDU Resources reported first-quarter earnings of $52.1 million, or $0.26 per share, compared with $25.1 million, or $0.13 per share, in the prior-year quarter.
MDU Resources acquires Spokane prestressed-concrete business[4]
Reported:
MDU Resources Group announced that it had acquired the assets of Oldcastle Infrastructure Spokane, and that the operation became part of its subsidiary Knife River Corporation.
Sources7 sources
- 1MDU Resourcesen.wikipedia.org
- 2MDU Resources调整2021年业绩指引prnewswire.com
- 3MDU Resources公布第一季度业绩finanznachrichten.de
- 4MDU Resources收购斯波坎预应力混凝土业务prnewswire.com
- 5MDU Resources Cuts FY Profit Guidancefinanznachrichten.de
- 6MDU Resources Reports 2021 Earnings, Initiates 2022 Guidanceprnewswire.com
- 7MDU Resources Reports Second Quarter Earnings; Affirms Earnings Guidanceprnewswire.com
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