MDU Resources Group, Inc.

MDU Resources Group, Inc. is engaged in regulated energy delivery and construction services businesses. Its segments include Electric, Natural gas distribution, Pipeline, Construction services, and Other. The Electric segment generates, transmits and distributes electricity. The Natural gas distribution segment distributes natural gas. The Pipeline segment provides natural gas transportation and underground storage services through a regulated pipeline system in the Rocky Mountain and northern Great Plains regions of the United States. The Construction services segment provides a full spectrum of construction services through its electrical and mechanical and transmission and distribution specialty contracting services across the United States. Its Other segment includes the activities of Centennial Capital, which, through its subsidiary InterSource Insurance Company, insures various types of risks as a captive insurer for certain of the Company's subsidiaries.