EX-23 3 exh23.txt CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS We consent to the incorporation by reference in the previously filed Registration Statement No. 333-70622 of MDU Resources Group, Inc. on Form S-8 of our report dated June 6, 2003, appearing in the Annual Report on this Form 11-K of MDU Resources Group, Inc. 401(k) Retirement Plan for the year ended December 31, 2002. /s/ DELOITTE & TOUCHE LLP DELOITTE & TOUCHE LLP Minneapolis, Minnesota June 26, 2003