Exhibit 23(d)(1)

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this Registration Statement on Form S-3 of our report dated February 28, 2013, relating to the consolidated financial statements of Duke Energy Indiana, Inc. and subsidiary (the “Company”), appearing in the Annual Report on Form 10-K of the Company for the year ended December 31, 2012, and to the reference to us under the heading “Experts” in the Prospectus, which is part of this Registration Statement.

/s/ DELOITTE & TOUCHE LLP

September 30, 2013