MDU Construction Services Group, Inc. is a subsidiary of MDU Resources Group, Inc. specializing electrical line construction, pipeline construction, inside electrical wiring, cabling and mechanical services, and the manufacture and distribution of specialty equipment. The company has offices in 16 states and is licensed to do business in 43 states. CSG employs nearly 5,500 people.

MDU Resources Group, Inc. is headquartered in Bismarck, N.D. The company was founded in 1924 as a regional electric and natural gas utility company, operating on the plains of eastern Montana and western North Dakota. It has been publicly traded on the New York Stock Exchange since 1948 under the ticker symbol MDU.