Bruce T. Imsdahl, president and chief executive officer of Montana-Dakota Utilities Co., announced today that he plans to retire on June 5 after a 38-year career with the utility. He also will retire from his positions as president and chief executive officer of Great Plains Natural Gas Co., and chief executive officer of Cascade Natural Gas Co.

“Bruce has done a tremendous job for the company,” said Terry D. Hildestad, president and chief executive officer of MDU Resources Group, Inc.  “His entire career was dedicated to our utility business and to serving our customers. He has played an important role in Montana-Dakota Utilities’ success, and in the growth of our utilities into a business that now serves more than 500,000 natural gas customers and 120,000 electric customers.

“Bruce is widely respected within the industry, as well as by employees. He leaves the company in a strong financial position and well-prepared for continued success.”

Imsdahl joined Montana-Dakota Utilities in 1970 as a staff engineer at the Lewis & Clark Generating Station. He advanced through a number of positions and was named vice president-power supply in 1989. In 1991 he became vice president-energy supply. Imsdahl was named executive vice president of utility operations early in 2003, and later that year became president of both Montana-Dakota and Great Plains. He assumed responsibility as chief executive officer of both utilities in November 2004, and was named chief executive officer of Cascade when MDU Resources acquired that company in 2007.

He is a member of the board of directors of the American Gas Association, the Edison Electric Institute and the Lignite Energy Council, and is a member of the North Dakota Energy Research Council.

Imsdahl, a registered professional engineer, is a graduate of North Dakota State University with a B.S. in mechanical engineering, and participated in the management program for executives at the University of Pittsburgh. He and his wife, Lynn, live in Bismarck, and have two children and four grandchildren.

MDU Resources Group, Inc., a member of the S&P MidCap 400 index, provides value-added natural resource products and related services that are essential to energy and transportation infrastructure, operating in three core lines of business: energy, construction materials and utility resources. MDU Resources includes natural gas and oil production, natural gas pipelines and energy services, construction materials and mining, construction services, and electric and natural gas utilities. For more information about MDU Resources, see the company’s Web site at www.mdu.com or contact the Investor Relations Department at investor@mduresources.com.


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     Richard Matteson
     Director of Communications and Public Affairs
     (701) 530-1700

     or

     Mark Hanson
     Senior Public Relations Representative
     (701) 530-1093

For investor relations inquiries, contact:
     Phyllis A. Rittenbach
     Director of Investor Relations
     (701) 530-1057