Affected customers included 200 in Durham, Goessel, Hillsboro and Lehigh supplied by Flint Hills Rural Electric Cooperative Association.
Although Westar Energy officials were unaware of what initially caused the outage, Erin La Row, communications representative, said the problem occurred when a jumper burned off a main transmission line that fed power to all seven locations.
?A jumper is a device that connects two pieces of a transmission or distribution system,? she said.
The majority of Westar customers and Flint Hills RECA were back in operation at 11:25 a.m. and all sub-stations were back online by 11:42 a.m.