The Board of Directors of MDU Resources Group, Inc. (NYSE:MDU) at its regular meeting today declared a quarterly common stock dividend of 13.5 cents per share, unchanged from the previous quarter.

The diversified natural resource company’s Board of Directors also declared dividends on preferred stock as follows:

• $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, 2007, to stockholders of record March 8, 2007.

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. MDU Resources includes natural gas and oil production, natural gas pipelines and energy services, construction materials and mining, construction services, electric and natural gas utilities, and independent power production. 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.

Contacts:

  Financial:
     Daryl Splichal
     Senior Assistant Treasurer
     (701) 530-1019
    
     Phyllis Rittenbach
     Director of Investor Relations
     (701) 530-1057

   Media:
     Laura Lueder
     Corporate Public Relations Manager
     (701) 530-1095