A strong infrastructure is the heart of our economy. It is the natural gas and electricity that power business, industry and ... our daily lives. It is the pipes and wires that connect our homes, factories, offices and stores to bring them to life. It is the transportation network of roads, highways and airports that keeps our economy moving. Infrastructure is our business. MDU Resources Group is Building a Strong America® through our regulated energy delivery and construction materials and services businesses. Our company was founded in 1924 as a small electric utility serving a handful of farm communities on the border of Montana and North Dakota. We realized early the value of delivering a variety of services, and grew our company by developing a core line of businesses. Today, MDU Resources is a multibillion-dollar corporation with operations, customers and employees across the country. We have more than 13,000 employees during peak construction season and are authorized to conduct business in 44 states. Since 1948, our stock has been traded on the New York Stock Exchange. It trades under the symbol MDU. read more