MDU Resources Group, Inc. is a utility natural gas distribution company. It provides natural resource products and related services, essential for energy transportation, regulated energy delivery and construction materials & services business. The company operates through regulated energy delivery platform and construction materials and services platform. It has five reportable business segments: Electric, Natural gas distribution, Pipeline, Construction materials and contracting, and Construction services. The Electric segment and The Natural Gas Distribution segment generate, transmit, and distribute electricity and gas respectively, in many states in the U.S. The Pipeline segment provides natural gas transportation, underground storage and gathering services. The Construction Materials and Contracting segment mines, processes as well as sells construction aggregates, produces & sells asphalt mix, and supplies ready-mixed concrete. The Construction Services segment provides all contracting related services.