2.2.0.7 false Review by Independent Registered Public Accounting Firm 0218 - Disclosure - Review by Independent Registered Public Accounting Firm true false false false 1 false false 2 Review by Independent Registered Public Accounting Firm [Abstract] 0 uns_ReviewByIndependentRegisteredPublicAccountingFirmAbstract uns false na duration Review by independent registered public accounting firm. false false false false false true false false false false false false 1 false false false false 0 0 false false false xbrli:stringItemType string Review by independent registered public accounting firm. false 3 REVIEW BY INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM 1 uns_ReviewByIndependentRegisteredPublicAccountingFirmTextBlock uns false na duration Review by independent registered public accounting firm. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 <!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" --> <!-- Begin Block Tagged Note 18 - uns:ReviewByIndependentRegisteredPublicAccountingFirmTextBlock--> <div style="font-family: Helvetica,Arial,sans-serif; margin-left: 0in; "> <div align="left" style="font-size: 10pt; margin-top: 10pt"><u><b>NOTE 18. REVIEW BY INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM</b></u> </div> <div align="left" style="font-size: 10pt; margin-top: 10pt">The UniSource Energy and TEP condensed consolidated financial statements as of June&#160;30, 2010 and for the three and six months ended June&#160;30, 2010 and 2009, have been reviewed by PricewaterhouseCoopers LLP, an independent registered public accounting firm. Their reports (dated August&#160;5, 2010) are included on pages 1 and 2. The reports of PricewaterhouseCoopers LLP state that they did not audit and they do not express an opinion on that unaudited financial information. Accordingly, the degree of reliance on their reports on such information should be restricted in light of the limited nature of the review procedures applied. PricewaterhouseCoopers LLP is not subject to the liability provisions of Section&#160;11 of the Securities Act of 1933 (the Act) for their reports on the unaudited financial information because neither of those reports is a &#8220;report&#8221; or a &#8220;part&#8221; of the registration statement prepared or certified by PricewaterhouseCoopers LLP within the meaning of Sections&#160;7 and 11 of the Act. </div> </div> <!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" --> <!-- Begin Block Tagged Note false false false us-types:textBlockItemType textblock Review by independent registered public accounting firm. No authoritative reference available. false 1 2 false UnKnown UnKnown UnKnown false true