About 134 Glendora customers are without power Sunday afternoon, according to Southern California Edison.
The unplanned power outage occurred around 10:50 a.m. near Morgan Ranch Road off Foothill Boulevard. Residents near Hunters Trail and Route 66 were also reporting outages in their neighborhood.
SCE estimated the power to be restored by 3:30 p.m.
The company cited “equipment problems” as the cause of the power outage, according to the SCE website.