MDU Resources Group, Inc. (NYSE:MDU) will webcast its year-end 2011 earnings and 2012 guidance conference call Feb. 2 following the release of its results.

The webcast will begin at 11 a.m. EST and can be accessed at www.mdu.com. A webcast replay and audio replay will be available. The dial-in number for audio replay is (855) 859-2056, or (404) 537-3406 for international callers, conference ID 40840208.

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, 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.
Phyllis A. Rittenbach, 701-530-1057
Director, Investor Relations