10-Q
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<span id="c03233exv32w1.htm"></span><html lang="en-US"> <HEAD> <title>Form 10-Q filed by on 2010-08-03</title> </HEAD> <BODY bgcolor="#FFFFFF"> <!-- PAGEBREAK --> <DIV style="font-family: 'Times New Roman',Times,serif; margin-left: .25in; width: 7.20in"> <DIV align="right" style="font-size: 10pt; margin-top: 10pt"><B>Exhibit 32.1</B> </DIV> <DIV align="center" style="font-size: 10pt; margin-top: 10pt"><B>CERTIFICATION<BR> OF<BR> CHIEF EXECUTIVE OFFICER<BR> AND<BR> CHIEF FINANCIAL OFFICER<BR> PURSUANT TO 18 U.S.C. 1350,<BR> AS ADOPTED PURSUANT TO<BR> SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002</B> </DIV> <DIV align="left" style="font-size: 10pt; margin-top: 10pt; text-indent: 4%">I, Donald E. Brandt, certify, pursuant to 18 U.S.C. 1350, as adopted pursuant to Section&nbsp;906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report on Form 10-Q of Pinnacle West Capital Corporation for the fiscal quarter ended June&nbsp;30, 2010 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Quarterly Report on Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Pinnacle West Capital Corporation. </DIV> <DIV align="left" style="font-size: 10pt; margin-top: 10pt">Date: August&nbsp;3, 2010. </DIV> <TABLE width="100%" border="0" cellspacing="0" cellpadding="0" style="font-size: 10pt"> <TR> <TD width="48%">&nbsp;</TD> <TD width="1%">&nbsp;</TD> <TD width="1%">&nbsp;</TD> <TD width="35%">&nbsp;</TD> <TD width="15%">&nbsp;</TD> </TR> <TR> <TD align="left">&nbsp;</TD> <TD colspan="3" style="border-bottom: 1px solid #000000" align="left"> /s/ Donald E. Brandt &nbsp;</TD> <TD>&nbsp;</TD> </TR><TR> <TD align="left">&nbsp;</TD> <TD colspan="3" align="left">Donald E. Brandt&nbsp;</TD> <TD>&nbsp;</TD> </TR><TR> <TD align="left">&nbsp;</TD> <TD colspan="3" align="left" nowrap>Chairman, President and Chief Executive Officer&nbsp;</TD> <TD>&nbsp;</TD> </TR> </TABLE> <DIV align="left" style="font-size: 10pt; margin-top: 10pt; text-indent: 4%">I, James R. Hatfield, certify, pursuant to 18 U.S.C. 1350, as adopted pursuant to Section&nbsp;906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report on Form 10-Q of Pinnacle West Capital Corporation for the fiscal quarter ended June&nbsp;30, 2010 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Quarterly Report on Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Pinnacle West Capital Corporation. </DIV> <DIV align="left" style="font-size: 10pt; margin-top: 10pt">Date: August&nbsp;3, 2010. </DIV> <TABLE width="100%" border="0" cellspacing="0" cellpadding="0" style="font-size: 10pt"> <TR> <TD width="48%">&nbsp;</TD> <TD width="1%">&nbsp;</TD> <TD width="1%">&nbsp;</TD> <TD width="35%">&nbsp;</TD> <TD width="15%">&nbsp;</TD> </TR> <TR> <TD align="left">&nbsp;</TD> <TD colspan="3" style="border-bottom: 1px solid #000000" align="left"> /s/ James R. Hatfield &nbsp;</TD> <TD>&nbsp;</TD> </TR><TR> <TD align="left">&nbsp;</TD> <TD colspan="3" align="left">James R. Hatfield&nbsp;</TD> <TD>&nbsp;</TD> </TR><TR> <TD align="left">&nbsp;</TD> <TD colspan="3" align="left" nowrap>Senior Vice President and Chief Financial Officer&nbsp;</TD> <TD>&nbsp;</TD> </TR> </TABLE> <P align="center" style="font-size: 10pt">&nbsp; <P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio --> </DIV> </BODY> </HTML>