A problem at a Westar Energy substation near 23rd and O’Connell Road caused an outage that left about 6600 hundred customers without power, Westar spokeswoman Gina Penzig said.

The outage, first reported at 8:55 p.m., stretches from an area bordered by 19th Street on the north, North 1100 Rd. on the south, and parts of Eudora on the east, according to Penzig. No information was available on how far west the outage area stretched.

As of 9:50 p.m., crews were on the scene working to determine the cause of the outage and repair the problems, and power was restored by 12:30 a.m. on Friday.