Pinnacle West Sets Date for 2018 First-Quarter Webcast/Conference Call

PHOENIX–(BUSINESS WIRE)–Pinnacle West Capital Corp. (NYSE: PNW) announced today that it plans to
release its 2018 first-quarter results before the U.S. financial markets
open on Wednesday, May 2, 2018.

That same day at noon ET (9 a.m. Arizona time), the Company will host a
live webcast of management’s conference call to discuss the Company’s
results, as well as recent developments. A replay of the webcast can be
accessed at pinnaclewest.com/presentations.
To access the live conference call by telephone, dial (877) 407-8035 or
(201) 689-8035 for international callers. A replay of the call also will
be available until 11:59 p.m. (ET), Wednesday, May 9, 2018, by calling
(877) 481-4010 in the U.S. and Canada or (919) 882-2331 internationally
and entering conference ID number 27282.

Pinnacle
West Capital Corp., an energy holding company based in Phoenix, has
consolidated assets of about $17 billion, about 6,200 megawatts of
generating capacity and 6,300 employees in Arizona and New Mexico.
Through its principal subsidiary, Arizona
Public Service, the Company provides retail electricity service to
nearly 1.2 million Arizona homes and businesses. For more information
about Pinnacle West, visit the Company’s website at pinnaclewest.com.

Contacts

Pinnacle West Capital Corp.
Media Contact:
Alan Bunnell (602)
250-3376
Analyst Contacts:
Stefanie Layton (602) 250-4541
Chalese
Haraldsen (602) 250-5643
Website: pinnaclewest.com