THE CORPORATE LIBRARY

Related Party Transactions and Outside Related Director Information

MDU Resources Group, Inc. (MDU)

3/12/2004, 3/11/2005 and 3/6/2006 Proxy Information

John K. Wilson was Vice President of Great Plains Natural Gas Co., an affiliate company of Durham Resources, LLC, until July 1, 2000. Great Plains Energy Corp. and Great Plains Natural Gas Co. were sold to MDU Resources Group, Inc. on July 1, 2000.