Montana-Dakota Utilities Co. Wind Projects Fully Operational

BISMARCK, N.D.--(BUSINESS WIRE)--Montana-Dakota Utilities Co. announced today that two new wind projects have achieved commercial operation. Montana-Dakota, a division of MDU Resources Group, Inc. (NYSE:MDU), constructed an additional 30 megawatts of wind generation in two locations.

“The projects were finished on schedule and provide us with additional electric generation for our customers”

The company developed the 19.5 megawatt Cedar Hills wind generation facility in southwest North Dakota. The project is located on leased land approximately five miles west of Rhame, N.D. It also expanded its Diamond Willow wind facility by an additional 10.5 MW. Diamond Willow, which went online in late 2007, is located near Baker, Mont. The expansion project includes seven additional wind turbines on leased land, and increases the capability of the site to 30 MW.

“The projects were finished on schedule and provide us with additional electric generation for our customers,” said Dave Goodin, president and chief executive officer of Montana-Dakota Utilities. “This further diversifies the types of electric generation used to meet our customers’ needs.”

The North Dakota site features 13 turbines and is located close to a Montana-Dakota transmission line for interconnection. Two new employees will be hired because of the wind expansion. The additional generation from both projects will provide enough electricity to meet the needs of about 10,000 Montana-Dakota residential customers in Montana, North Dakota and South Dakota.

Montana-Dakota has nearly $130 million invested in wind generation and other renewable projects to serve its electric customers in Montana, North Dakota and South Dakota.

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 website at www.mdu.com or contact the Investor Relations Department at [e-mail].