MDU Resources Group, Inc. (NYSE:MDU) is celebrating 60 years of listing on the New York Stock Exchange. In recognition of this anniversary, President and Chief Executive Officer Terry D. Hildestad will ring The Opening Bell(sm). at 9:30 a.m. EDT Thursday, March 13, at the exchange.

“We’re very proud of our long history of providing excellent returns to our shareholders while serving our customers with outstanding products and services,” Hildestad said. “We’re honored to be ringing The Opening Bell to mark the corporation’s 60th year on the New York Stock Exchange.”

Only about 7 percent of NYSE-listed companies have been traded on the exchange for more than 60 years.

A webcast of The Opening Bell event will be available at www.mdu.com.

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. The company operates 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 contracting, 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.

Investor Contact:
     Phyllis A. Rittenbach
     Director of Investor Relations
     (701) 530-1057

Media Contact:
     Rick Matteson
     Director of Communications and Public Affairs
     (701) 530-1700

MEDIA NOTE: Photos of the event will be available via Associated Press/New York, (212) 621-1902; Reuters America (646) 223-6285; and Bloomberg Photo, (212) 617-3420. The Opening Bell(sm) feed, starting at 9:25 a.m., is available via Ascent loop No. 1630 and by request via The Switch.