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<span id="c09734exv21w1.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: Helvetica,Arial,sans-serif; margin-left: .25in; width: 7.50in"> <DIV align="right" style="font-size: 10pt; margin-top: 10pt"><B>Exhibit 21.1</B> </DIV> <DIV align="center"> <TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%"> <!-- Begin Table Head --><TR valign="bottom"> <TD width="100%"> </TD> </TR> <!-- End Table Head --> <!-- Begin Table Body --> <TR valign="bottom"><!-- Blank Space --> <TD><DIV style="margin-left:15px; text-indent:-15px"> </DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD><DIV style="margin-left:15px; text-indent:-15px">PNW has the following subsidiaries:</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">1) Arizona Public Service Company</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">2) APS Energy Services Company, Inc.</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">3) El Dorado Investment Company</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">4) Pinnacle West Energy Corporation (merged into PWCC 8/1/06)</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">5) SunCor Development Company</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">6) APSES Holdings, Inc.</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD><DIV style="margin-left:45px; text-indent:-15px">APS Energy L.P. (dissolved 9/29/06)</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">7) Pinnacle West Marketing & Trading Co., LLC</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"><!-- Blank Space --> <TD><DIV style="margin-left:15px; text-indent:-15px"> </DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD><DIV style="margin-left:15px; text-indent:-15px">Pinnacle West Energy affiliates:</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">1) GenWest, LLC } now under PWCC</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">2) APACS Holdings, LLC } now under PWCC</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"><!-- Blank Space --> <TD><DIV style="margin-left:15px; text-indent:-15px"> </DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD><DIV style="margin-left:15px; text-indent:-15px">Arizona Public Service Company has the following subsidiaries/affiliates:</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">1) APS Foundation, Inc.</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">2) Axiom Power Solutions, Inc.</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">3) BIXCO, Inc.</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">4) PWE NEWCO, Inc.</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">5) Powertree Carbon Co., LLC</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"><!-- Blank Space --> <TD><DIV style="margin-left:15px; text-indent:-15px"> </DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD><DIV style="margin-left:15px; text-indent:-15px">APS Energy Services Company has or has had the following affiliates:</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">1) Apex Power LLC</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">2) Northwind Phoenix LLC (a Delaware LLC/subsidiary of APSES) (sold 6/22/10)</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">3) Tucson District Energy, LLC (an Arizona LLC/subsidiary of Northwind Phx LLC) (sold 6/22/10)</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">4) Crest Power, LLC (dormant)</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"><!-- Blank Space --> <TD><DIV style="margin-left:15px; text-indent:-15px"> </DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD><DIV style="margin-left:15px; text-indent:-15px">El Dorado has or has had the following investments<B>/</B>affiliates:</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">1) Acoustic Locating Services, LLC</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">2) Aegis Technologies, Inc. (dissolved in 2009)</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">3) Arizona Business Accelerator (dissolved in 2008)</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">4) Arizona Professional Baseball Ltd Partnership</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">5) Dominion Fund II (dissolved as of 12/31/02)</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">6) El Dorado Ventures / El Dorado Ventures II (dissolved as of 12/31/02)</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">7) El Dorado Ventures III (dissolving)</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">8) Gateway Data Sciences Corp. (dissolved as of 12/31/02)</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">9) NAC Holding Inc./ NAC International Inc. (all stock sold on 11/18/04 to USEC, Inc)</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">10) NxtPhase Corporation (sold in 2009)</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">11) Phoenix Downtown Theater LLC</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">12) Phoenix Suns Ltd Partnership (sold on 6/30/04)</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">13) PowerOneData, Inc. (sold in 2008)</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">14) Serveron Corporation (sold in 2007)</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">15) Underground Imaging Technologies (Vermeer Manufacturing Company)</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">16) SoftSwitching Technologies</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD><DIV style="margin-left:30px; text-indent:-15px">17) Zolo Technologies</DIV></TD> </TR> <!-- End Table Body --></TABLE> </DIV> <DIV align="center"> <TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%"> <!-- Begin Table Head --><TR valign="bottom"> <TD width="2%"> </TD> <TD width="1%"> </TD> <TD width="97%"> </TD> </TR> <!-- End Table Head --> <!-- Begin Table Body --> <TR valign="bottom" style="padding-top: 1px"> <TD colspan="3" valign="top" align="left">SunCor has the following subsidiaries and other related entities:</TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD align="left" valign="top">1.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">Centrepoint Associates, LLC (Kimco)</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD align="left" valign="top">2.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">Club West Golf Course, LLC</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD align="left" valign="top">3.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">Coral Canyon HD, LLC (SITLA)</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD align="left" valign="top">4.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">Golf de Mexico, S.A. de C.V.</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD align="left" valign="top">5.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">Hayden Ferry Lakeside, LLC</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD align="left" valign="top"> </TD> <TD> </TD> <TD><DIV style="margin-left:30px; text-indent:-15px">Lakeside Residential Communities, LLC</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD align="left" valign="top"> </TD> <TD> </TD> <TD><DIV style="margin-left:45px; text-indent:-15px">BV at Hayden Ferry Lakeside, LLC</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD align="left" valign="top"> </TD> <TD> </TD> <TD><DIV style="margin-left:45px; text-indent:-15px">Edgewater at Hayden Ferry Lakeside, LLC</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD align="left" valign="top"> </TD> <TD> </TD> <TD><DIV style="margin-left:45px; text-indent:-15px">Waterford at Hayden Ferry Lakeside, LLC</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD align="left" valign="top"> </TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">Hayden Ferry Lakeside II, LLC</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD align="left" valign="top"> </TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">Hayden Ferry Lakeside III, LLC</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD align="left" valign="top">6.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">Hidden Hills of Scottsdale, LLC</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD align="left" valign="top">7.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">Highland Water Company, Inc.</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD align="left" valign="top">8.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">Kabuto SunCor JV (Kabuto Int’l Corp.)</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD align="left" valign="top">9.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">Marina Heights, LLC</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD align="left" valign="top">10.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">Palm Valley 303 Building 1, LLC</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD align="left" valign="top">11.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">Palm Valley Golf Club, Inc.</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD align="left" valign="top">12.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">Palm Valley Professional Plaza, LLC</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD align="left" valign="top">13.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">Rancho Viejo de Santa Fe, Inc.</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD align="left" valign="top">14.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">Riverside Distribution Center, LLC (Ryan Buckeye, LLC)</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD align="left" valign="top">15.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">Scottsdale Mountain Limited Partnership</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD align="left" valign="top">16.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">SDC Prescott, LLC</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD align="left" valign="top">17.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">SDC Prescott Valley, LLC</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD align="left" valign="top">18.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">SDC Yavapai, LLC</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD align="left" valign="top">19.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">Sedona Golf Resort LC (Sedona Assoc. LP)</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD align="left" valign="top">20.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">StoneRidge Commercial, LLC</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD align="left" valign="top">21.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">StoneRidge — Prescott Valley LLC</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD align="left" valign="top"> </TD> <TD> </TD> <TD><DIV style="margin-left:30px; text-indent:-15px">StoneRidge Golf Course, LLC</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD align="left" valign="top">22.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">SunCor Homes, Inc. (fka Golden Heritage Homes, Inc.)</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD align="left" valign="top"> </TD> <TD> </TD> <TD><DIV style="margin-left:30px; text-indent:-15px">SunCor Construction AZ, Inc</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD align="left" valign="top"> </TD> <TD> </TD> <TD><DIV style="margin-left:45px; text-indent:-15px">Golden Heritage Construction Nevada, LLC</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD align="left" valign="top"> </TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">SunCor Financial, LLC</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD align="left" valign="top">23.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">SunCor Construction, Inc.</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD align="left" valign="top">24.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">SunCor Golf, Inc.</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD align="left" valign="top"> </TD> <TD> </TD> <TD><DIV style="margin-left:30px; text-indent:-15px">Westworld Golf Course, LLC</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD align="left" valign="top">25.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">SunCor Idaho, Inc.</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD align="left" valign="top"> </TD> <TD> </TD> <TD><DIV style="margin-left:30px; text-indent:-15px">Avimor, LLC</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD align="left" valign="top"> </TD> <TD> </TD> <TD><DIV style="margin-left:30px; text-indent:-15px">SunCor Realty & Management Idaho, LLC</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD align="left" valign="top">26.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">SunCor New Mexico, Inc.</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD align="left" valign="top"> </TD> <TD> </TD> <TD><DIV style="margin-left:30px; text-indent:-15px">SunCor Albuquerque, LLC</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD align="left" valign="top"> </TD> <TD> </TD> <TD><DIV style="margin-left:30px; text-indent:-15px">SunCor Construction NM, LLC</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD align="left" valign="top">27.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">SunCor Realty & Management Company</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD align="left" valign="top">28.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">SunCor Utah, Inc.</DIV></TD> </TR> <TR valign="bottom" style="padding-top: 1px"> <TD align="left" valign="top">29.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">SunRidge Canyon, LLC</DIV></TD> </TR> <TR valign="bottom" style="background: #cceeff; padding-top: 1px"> <TD align="left" valign="top">30.</TD> <TD> </TD> <TD><DIV style="margin-left:15px; text-indent:-15px">Talavi Associates, LLC (WLD Partners)</DIV></TD> </TR> <!-- End Table Body --></TABLE> </DIV> <P align="center" style="font-size: 10pt"> <P align="center" style="font-size: 10pt"><!-- Folio --><!-- /Folio --> </DIV> </BODY> </HTML>