Exhibit 23(a)
[Letterhead of Deloitte & Touche LLP]
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the incorporation by reference in this Registration Statement on Form S-3 of our reports dated February 24, 2017, relating to the consolidated financial statements and financial statement schedules of MDU Resources Group, Inc. and subsidiaries, and the effectiveness of MDU Resources Group, Inc. and subsidiaries’ internal control over financial reporting, appearing in the Annual Report on Form 10-K of MDU Resources Group, Inc. for the year ended December 31, 2016, and to the reference to us under the heading "Experts" in the Prospectus, which is part of this Registration Statement.
/s/ Deloitte & Touche LLP
Minneapolis, Minnesota
August 18, 2017
