Residents of northern Mercer County and southern Crawford County were without power for about an hour Monday afternoon.

About 16,200 Pennsylvania Power Co. customers in Greenville, Jamestown, Conneaut Lake and Hartstown lost electricity at 11:49 a.m., said Randy Coleman, area manager for Penn Power. The power went out after an insulator failed at a substation on Maysville Road in West Salem Township, Coleman said.

Coleman said the heat wave had nothing to do with the outage; it was a mechanical failure.

Power was restored by 12:53 p.m., and Coleman said he didn't anticipate any more problems.