Investors Proxy Information

PINNACLE WEST ANNUAL SHAREHOLDER MEETING MOVES TO LIVE WEBCAST

This year’s Annual Meeting will be a completely virtual meeting of shareholders, which will be conducted via live webcast. You will be able to attend the Annual Meeting online by visiting www.virtualshareholdermeeting.com/PNW. You also will be able to vote your shares electronically during the Annual Meeting (other than shares held through our 401(k) Plan, which must be voted prior to the meeting).

We are looking forward to using the virtual Annual Meeting technology. Holding a virtual meeting will make the Annual Meeting available to all of our shareholders from any location. A virtual meeting is also environmentally friendly and sustainable over the long-term.

By Internet Before the Meeting www.proxyvote.com
Use the internet to transmit your voting instructions and for electronic delivery of information up until 11:59 P.M. Eastern Time the day before the cut-off date or meeting date. Have your proxy card in hand when you access the web site and follow the instructions to obtain your records and to create an electronic voting instruction form.

By Internet During the Meeting www.virtualshareholdermeeting.com/PNW
Have the information that is printed in the box marked by the arrow available and follow the instructions.

By Phone Before the Meeting  1-800-690-6903
Use any touch-tone telephone to transmit your voting instructions up until 11:59 P.M. Eastern Time the day before the cut-off date or meeting date. Have your proxy card in hand when you call and then follow the instructions.

401(k) shareholder cut-off is 11:59 P.M. Eastern Time May 14, 2017
Registered and Beneficial shareholder cut-off is 11:59 P.M. Eastern Time May 16, 2017