Xcel Energy (XEL) S-3ASR Automatic shelf registration

Exhibit 23.01

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference into this Registration Statement on Form S-3 of our reports dated February 24, 2006, relating to the financial statements and financial statement schedules of Xcel Energy Inc., and management’s report on the effectiveness of internal control over financial reporting appearing in the Annual Report on Form 10-K of Xcel Energy Inc. for the year ended December 31, 2005, and to the reference to us under the heading “Experts” in the Prospectus, which is part of this Registration Statement.

/s/ DELOITTE & TOUCHE LLP

Deloitte & Touche LLP

Minneapolis, Minnesota

May 26, 2006