Exhibit 99.1

Last Updated 10/27/2006

Pinnacle West Capital Corporation

Quarterly Consolidated Statistical Summary

Periods Ended September 30, 2006 and 2005

List of Contents

2006 Third Quarter Summary

2006 Year-to-Date

2005 by Quarter

2004 by Quarter

2003 by Quarter

Quarters may not sum to totals due to rounding.

Certain current and prior-year amounts have been reclassified to conform to current-period presentation.

The definitions of terms used in this statistical summary are contained
in the “Glossary of Terms” on the Pinnacle West website at:
http://www.pinnaclewest.com/files/investors/2006Q3QuarStatsGloss.pdf

This statistical data may be graphed in various quarterly or annual comparisons
using the “Interactive Charts” tool on the Pinnacle West website at:
http://www.pinnaclewest.com/main/pnw/investors/financials/quarterly/landing.html