The utility company Salt River Project says more than 15,000 customers around the Valley experienced outages Friday night.
SRP says some M-power (pre-pay) customers lost power due to a technical issue.
The company says at around 8 p.m. their phone lines, the mobile app, My Account login and M-Power customers were impacted.
As of 1 a.m. Saturday, power was restored to all customers.
In a statement, SRP says:
If a customer has any further issues, they should please call (602) 236-8888. SRP phone lines are back up and running.
We apologize for the inconvenience and worked to resolve the issue as quickly as possible. SRP is conducting an investigation to determine what caused the unexpected outages to occur.