Xcel Energy 2006 Annual Report Download - page 76

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66
Report of Independent Registered Public Accounting Firm
Board of Directors and Stockholders
Xcel Energy Inc.
We have audited the accompanying consolidated balance sheets and consolidated statements of capitalization of Xcel Energy Inc. and
subsidiaries (the “Company”) as of December 31, 2006 and 2005, and the related consolidated statements of income, common
stockholders’ equity and comprehensive income, and cash flows for each of the three years in the period ended December 31, 2006.
Our audits also included the financial statement schedules listed in the Index at Item 15. These financial statements and financial
statement schedules are the responsibility of the Company’s management. Our responsibility is to express an opinion on the financial
statements and financial statement schedules based on our audits.
We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those
standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of
material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial
statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as
evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.
In our opinion, such consolidated financial statements present fairly, in all material respects, the financial position of Xcel Energy Inc.
and subsidiaries as of December 31, 2006 and 2005, and the results of their operations and their cash flows for each of the three years
in the period ended December 31, 2006, in conformity with accounting principles generally accepted in the United States of America.
Also, in our opinion, such financial statement schedules, when considered in relation to the basic consolidated financial statements
taken as a whole, present fairly, in all material respects, the information set forth therein.
As discussed in Note 9 to the consolidated financial statements, the Company adopted Statement of Financial Accounting Standards
No. 158, “Employers’ Accounting for Defined Benefit Pension and Other Postretirement Plans,” as of December 31, 2006.
We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the
effectiveness of the Company’s internal control over financial reporting as of December 31, 2006, based on the criteria established in
Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission and
our report dated February 22, 2007 expressed an unqualified opinion on management’s assessment of the effectiveness of the
Company’s internal control over financial reporting and an unqualified opinion on the effectiveness of the Company’s internal control
over financial reporting.
/s/ DELOITTE & TOUCHE LLP
Minneapolis, Minnesota
February 22, 2007