About 5,400 people were without power Tuesday night in neighborhoods in northern Glendale.
Officials with Glendale Water and Power said on the utility's Twitter account that the outage was in the Sparr Heights area of the city.
Crews "are working on power restoration as quickly as possible and are aware of all areas affected," the utility said.
[Updated, 10:14 p.m. PDT, March 18: Parts of La Crescenta were also affected by the outage, the utility said.]
It was not immediately clear what sparked the outage. The utility did not indicate how long it would take to restore power in the area.
[Updated, 5:15 a.m. PDT, March 19: Power was restored shortly after midnight, the utility announced on Twitter, adding: "Thank you to our crews for working so hard and to our customers for their patience."]