Exhibit 23.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the incorporation by reference in this Registration Statement on Form S-3 of our reports dated March 1, 2007, relating to the consolidated financial statements and financial statement schedule of Sierra Pacific Resources (which report expresses an unqualified opinion and includes an explanatory paragraph related to the adoption of Statement of Financial Accounting Standards No. 158) and to management's report on the effectiveness of internal control over financial reporting, appearing in the Annual Report on Form 10-K of Sierra Pacific Resources for the year ended December 31, 2006 and to the reference to us under the heading "Experts" in the Prospectus, which is part of such Registration Statement.
DELOITTE & TOUCHE LLP
Reno, Nevada
September 12, 2007
