Published: February 17, 2011

MDU Resources Declares Quarterly Dividends on Common and Preferred Stock

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BISMARCK, N.D. - (BUSINESS WIRE) - The MDU Resources Group (NYSE: MDU) board of directors today declared quarterly dividends on the company's common and preferred stock.

The dividend for common stock is 16.25 cents per share, unchanged from the previous quarter. Dividends for preferred stock are:

$1.12-1/2 per share on 4.50 percent Series Preferred
$1.17-1/2 per share on 4.70 percent Series Preferred
$1.27-1/2 per share on 5.10 percent Series Preferred

The dividends are payable April 1, 2011 to stockholders of record March 10, 2011.

MDU Resources Group, Inc., a Fortune 500 company and 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, including regulated businesses, an exploration and production company and construction companies. MDU Resources includes regulated electric and natural gas utilities and regulated natural gas pipelines and energy services, natural gas and oil production, construction materials and contracting, and construction services. 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.

MDU Resources Group, Inc.
Financial:
Phyllis A. Rittenbach, 701-530-1057
Director - Investor Relations
or
Media:
Rick Matteson, 701-530-1700
Director of Communications and Public Affairs