Historical Timeline

Historical Timeline

1924

Company Begins

The company is incorporated and begins acquiring electric utilities in eastern Montana.

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1927

Natural Gas

A subsidiary company, now known as WBI Energy, is formed to look for natural gas and build pipelines to transport the gas so it can be used to fuel electric generating stations.

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1935

One Company

All subsidiaries merge under a single corporation, Montana-Dakota Utilities Co.

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1945

Coal For Fuel

The company acquires a coal-mining operation to supply fuel for its electric generating stations.

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1948

On The NYSE

The company common stock begins trading Sept. 20, 1948, on the New York Stock Exchange. At that time, the company had assets of $59 million and total revenues of $11 million.

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1968

On The Move

The company moves its corporate headquarters from Minneapolis to Bismarck, North Dakota, to be located closer to the company's operational territories.

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1985

New Name

The corporation realigns under a new name, MDU Resources Group, Inc., to better reflect its expanding operations.

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1992

Rock On!

MDU Resources decides to use its coal-mining expertise to venture in a new direction, beginning to acquire aggregate mining operations and getting into the construction materials and contracting business.

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1997

Utility Services

Expanding on the company's extensive utility experience, MDU Resources launches a construction services division that provides a variety of utility, electrical wiring and mechanical services.

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2000

In Minnesota

MDU Resources expands its utility operations into Minnesota with the acquisition of Great Plains Natural Gas Co., a natural gas distribution company.

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2001

Still Rocking!

MDU Resources sells its coal operations, becoming an aggregate-based construction materials business.

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2007

In Oregon and Washington

MDU Resources acquires Cascade Natural Gas Corporation, which provides natural gas utility services to customers in Oregon and Washington. This acquisition doubles the number of utility customers that MDU Resources serves.

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2008

In Idaho

MDU Resources acquires Intermountain Gas Company, which serves more than 300,000 natural gas utility customers in Idaho.

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