Contact (Corporate Responsibility Report)
David Jallo, Corporate Environmental, Health and Safety Department 
P.O. Box 53999, Mail Station 8376 Phoenix, AZ 85004
David.Jallo@aps.com
(602) 250-3528 (ph)
(602) 250-3872 (fax)

Additional contacts for Shareholder Services, Investor Relations, Human Resources and other company areas are listed in the Contact Us section at the top of this page.

Dun & Bradstreet Number
131155400
APS Dun & Bradstreet Number
184147700
Corporate Tax ID Number
86-001170

Company Information
This report provides information on our company’s performance across three areas of sustainability —ق economic, environmental and social.

Our report was prepared in accordance with guidelines set by Ceres, a coalition of investors and public interest organizations.ق We have also included a cross-reference to applicable report sections ofقthe Global Reporting Initiativeق(GRI),قwhich was established to develop globally applicable standards for sustainability reporting.

Pinnacle West:

• is in Standard and Poor's 500 index and is traded on the New York Stock Exchange under the symbol: PNW
• is headquartered in Phoenix, Arizona one of the fastest growing regions in the United States
• assets include approximately 6,400 megawatts of plant generation capacity
• was named one of the Global 100 Most Sustainable Corporations in the World by Corporate Knights at the 2005 World Economic Forum in Davos,قSwitzerland
• was given an AAA (highest) rating, and ranked in top two utilities in the United Statesقin 2005 by Innovest Strategic Advisory for environmental and sustainable performanceق
• was listed in the 2005 Dow Jones World Sustainability Index and the 2005 Dow Jones North America Sustainability Index as a sustainability leader in the electric industry.
• قis a leader in the development of solar technology
• Subsidiary, APS ranked first among investor-owned electric utilities in the West and third among investor-owned utilities in the nation in J.D. Power and Associates' 2005 Electric Utility Residential Customer Satisfaction Study

Major Products and Services

Pinnacle West and its family of companies have earned a reputation for customer satisfaction, shareholder value, operational excellence and business integrity. Pinnacle West is a Phoenix-based company with consolidated assets of approximately $11.3 billion.

Pinnacle West has three principal business segments (determined by products, services and the regulatory environment):

• the regulated electricity segment (75% of operating revenues in 2005), which consists of traditional regulated retail and wholesale electricity businesses (primarily electric service to Native Load customers) and related activities, and includes electricity generation, transmission and distribution

• the real estate segment (11% of operating revenues in 2005), which consists ofق real estate development and investment activities

• the marketing and trading segment (12% of operating revenues in 2005), which consists of competitive energy business activities, including wholesale marketing and trading and commodity-related energy services.

Our largest affiliate, Arizona Public Service (APS), generates, sells and delivers electricity and energy-related products and services. APS owns combined generation capacity in excess of 6,400 megawatts (MW) and operates plants with a combined capacity in excess of 10,000 MW. قAPS serves more than 1,000,000 customers in 11 of Arizona’s 15 counties, and is the operator and co-owner of the Palo Verde Nuclear Generating Station – a primary source of electricity for the Southwest, and the nation's largest power producer for 14 consecutive years.

Pinnacle West’s other notable subsidiaries are SunCor, which is engaged in real estate development and investment activities, and APS Energy Services, which provides competitive energy services and products in the western United States. In this 2005 report, we are providing profiles on SunCor and APS Energy Services as an initial step in incorporating these subsidiaries in our Corporate Responsibility Report. Please use the navigation tree on the left side of this report to view additional information on these companies.

Another Pinnacle West subsidiary, Pinnacle West Energy (PWEC), which owned and operated unregulated generating plants, transferred the PWEC Dedicated Assets to APS on July 29, 2005 and sold its 75 percent ownership interest in Silverhawk Power Plant to NPC on January 10, 2006. As a result, Pinnacle West Energy no longer owns any generating plants and has ceased operations.

PNW Strategic Objectives

Conversion Factors
Throughout this report, information is presented in United States measurement units.
Conversions to international figures are:

1 pound = 0.454 kilograms
1 ton = 907.185 kilograms
1 gallon = 3.785 liters
1 mile = 1.609 kilometers
1 kilowatt = 3,600,000 joules
1 megawatt = 3,600 joules