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<div style="font-family: 'Times New Roman',Times,serif; margin-left: 0in; ">
<div align="left" style="font-size: 10pt; margin-top: 10pt"><b>4. Retirement Plans and Other Benefits</b>
</div>
<div align="left" style="font-size: 10pt; margin-top: 10pt; text-indent: 4%">Pinnacle West sponsors a qualified defined benefit and account balance pension plan, a
non-qualified supplemental excess benefit retirement plan, and other postretirement benefit plans
for the employees of Pinnacle West and our subsidiaries. Pinnacle West uses a December 31
measurement date for its pension and other postretirement benefit plans. The market-related value
of our plan assets is their fair value at the measurement date.
</div>
<div align="left" style="font-size: 10pt; margin-top: 10pt; text-indent: 4%">The following table provides details of the plans’ net periodic benefit costs and the portion
of these costs charged to expense (including administrative costs and excluding amounts capitalized
as overhead construction, billed to electric plant participants or
charged to a regulatory asset) (dollars in millions):
</div>
<div align="center">
<table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<tr valign="bottom">
<td width="44%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="9%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="9%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="9%"> </td>
<td width="1%"> </td>
<td width="3%"> </td>
<td width="1%"> </td>
<td width="9%"> </td>
<td width="1%"> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="6" style="border-bottom: 1px solid #000000">Pension Benefits</td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="6" style="border-bottom: 1px solid #000000">Other Benefits</td>
<td> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="6">Three Months Ended</td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="6">Three Months Ended</td>
<td> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="6" style="border-bottom: 1px solid #000000">March 31,</td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="6" style="border-bottom: 1px solid #000000">March 31,</td>
<td> </td>
</tr>
<tr style="font-size: 10pt" valign="bottom">
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="2" style="border-bottom: 1px solid #000000">2011</td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="2" style="border-bottom: 1px solid #000000">2010</td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="2" style="border-bottom: 1px solid #000000">2011</td>
<td> </td>
<td> </td>
<td nowrap="nowrap" align="center" colspan="2" style="border-bottom: 1px solid #000000">2010</td>
<td> </td>
</tr>
<!-- End Table Head -->
<!-- Begin Table Body -->
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Service cost — benefits earned
during the period
</div></td>
<td> </td>
<td align="left">$</td>
<td align="right">16</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">15</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">6</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">5</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Interest cost on benefit
obligation
</div></td>
<td> </td>
<td> </td>
<td align="right">31</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">31</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">12</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">11</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Expected return on plan assets
</div></td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right">(33</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right">(31</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right">(10</td>
<td nowrap="nowrap">)</td>
<td> </td>
<td nowrap="nowrap" align="left"> </td>
<td align="right">(10</td>
<td nowrap="nowrap">)</td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Amortization of:
</div></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Transition obligation
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">1</td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:30px; text-indent:-15px">Prior service cost
</div></td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">1</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">—</td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:30px; text-indent:-15px">Net actuarial loss
</div></td>
<td> </td>
<td> </td>
<td align="right">6</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">6</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">3</td>
<td> </td>
<td> </td>
<td> </td>
<td align="right">3</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td>
<div style="margin-left:15px; text-indent:-15px"> 
</div></td>
<td> </td>
<td nowrap="nowrap" colspan="2" align="right" style="border-top: 1px solid #000000"> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" colspan="2" align="right" style="border-top: 1px solid #000000"> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" colspan="2" align="right" style="border-top: 1px solid #000000"> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" colspan="2" align="right" style="border-top: 1px solid #000000"> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">Net periodic benefit cost
</div></td>
<td> </td>
<td align="left">$</td>
<td align="right">20</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">22</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">11</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">10</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td>
<div style="margin-left:15px; text-indent:-15px"> 
</div></td>
<td> </td>
<td nowrap="nowrap" colspan="2" align="right" style="border-top: 3px double #000000"> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" colspan="2" align="right" style="border-top: 3px double #000000"> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" colspan="2" align="right" style="border-top: 3px double #000000"> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" colspan="2" align="right" style="border-top: 3px double #000000"> </td>
<td> </td>
</tr>
<tr valign="bottom" style="background: #cceeff">
<td>
<div style="margin-left:15px; text-indent:-15px">Portion of cost charged to
expense
</div></td>
<td> </td>
<td align="left">$</td>
<td align="right">8</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">11</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">4</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">5</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td>
<div style="margin-left:15px; text-indent:-15px"> 
</div></td>
<td> </td>
<td nowrap="nowrap" colspan="2" align="right" style="border-top: 3px double #000000"> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" colspan="2" align="right" style="border-top: 3px double #000000"> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" colspan="2" align="right" style="border-top: 3px double #000000"> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" colspan="2" align="right" style="border-top: 3px double #000000"> </td>
<td> </td>
</tr>
<tr valign="bottom">
<td>
<div style="margin-left:15px; text-indent:-15px">APS’s share of cost charged
to expense
</div></td>
<td> </td>
<td align="left">$</td>
<td align="right">8</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">10</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">4</td>
<td> </td>
<td> </td>
<td align="left">$</td>
<td align="right">5</td>
<td> </td>
</tr>
<tr style="font-size: 1px">
<td>
<div style="margin-left:15px; text-indent:-15px"> 
</div></td>
<td> </td>
<td nowrap="nowrap" colspan="2" align="right" style="border-top: 3px double #000000"> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" colspan="2" align="right" style="border-top: 3px double #000000"> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" colspan="2" align="right" style="border-top: 3px double #000000"> </td>
<td> </td>
<td> </td>
<td nowrap="nowrap" colspan="2" align="right" style="border-top: 3px double #000000"> </td>
<td> </td>
</tr>
<!-- End Table Body -->
</table>
</div>
<!-- Folio -->
<!-- /Folio -->
</div>
<!-- PAGEBREAK -->
<div style="font-family: 'Times New Roman',Times,serif; margin-left: 0in; ">
<div align="center" style="font-size: 10pt; margin-top: 0pt">
<b>
</b>
</div>
<div align="left" style="font-size: 10pt; margin-top: 10pt"><b>Contributions</b>
</div>
<div align="left" style="font-size: 10pt; margin-top: 10pt; text-indent: 4%">The required minimum contribution to our pension plan is zero in 2011 and approximately $85
million in 2012. The contributions to our other postretirement benefit plans for 2011 and 2012 are
expected to be approximately $20 million each year. APS and other subsidiaries fund their share of
the contributions. APS’s share is approximately 99% of both plans.
</div>
</div>
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