Arizona Public Service (APS) supplies electricity in Clarkdale. It is a utility rather than somewhere you call in at, so there is no street address here. Customer service is listed as running 24/7 on (800) 253-9405, which is also the number for an outage or a downed line. Starting service, stopping it, billing and outage maps are all on aps.com. If you are moving in, call before your first day rather than after: connection is not always same day, and a vacant property may have been disconnected rather than just switched off.
