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<span id="c09734exv32w1.htm"></span><html lang="en-US"> <HEAD> <title>Form 10-K filed by on 2011-02-18</title> </HEAD> <BODY bgcolor="#FFFFFF"> <!-- PAGEBREAK --> <DIV style="font-family: 'Times New Roman',Times,serif; margin-left: .25in; width: 7.50in"> <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 906 of the Sarbanes-Oxley Act of 2002, that the Annual Report on Form 10-K of Pinnacle West Capital Corporation for the fiscal year ended December 31, 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 Annual Report on Form 10-K 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: February 18, 2011. </DIV> <TABLE width="100%" border="0" cellspacing="0" cellpadding="0" style="font-size: 10pt"> <TR> <TD width="48%"> </TD> <TD width="1%"> </TD> <TD width="1%"> </TD> <TD width="35%"> </TD> <TD width="15%"> </TD> </TR> <TR> <TD align="left"> </TD> <TD colspan="3" style="border-bottom: 1px solid #000000" align="left"> /s/ Donald E. Brandt </TD> <TD> </TD> </TR><TR> <TD align="left"> </TD> <TD colspan="3" align="left">Donald E. Brandt </TD> <TD> </TD> </TR><TR> <TD align="left"> </TD> <TD colspan="3" align="left">Chairman, President and Chief Executive Officer </TD> <TD> </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 906 of the Sarbanes-Oxley Act of 2002, that the Annual Report on Form 10-K of Pinnacle West Capital Corporation for the fiscal year ended December 31, 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 Annual Report on Form 10-K 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: February 18, 2011. </DIV> <TABLE width="100%" border="0" cellspacing="0" cellpadding="0" style="font-size: 10pt"> <TR> <TD width="48%"> </TD> <TD width="1%"> </TD> <TD width="1%"> </TD> <TD width="35%"> </TD> <TD width="15%"> </TD> </TR> <TR> <TD align="left"> </TD> <TD colspan="3" style="border-bottom: 1px solid #000000" align="left"> /s/ James R. Hatfield </TD> <TD> </TD> </TR><TR> <TD align="left"> </TD> <TD colspan="3" align="left">James R. Hatfield </TD> <TD> </TD> </TR><TR> <TD align="left"> </TD> <TD colspan="3" align="left" nowrap>Senior Vice President and Chief Financial Officer </TD> <TD> </TD> </TR> </TABLE> <P align="center" style="font-size: 10pt"> <P align="center" style="font-size: 10pt"><!-- Folio --><!-- /Folio --> </DIV> </BODY> </HTML>