Power has been restored for approximately 20 buildings in downtown Denver following an outage that lasted for hours Monday.

Xcel said in a news release 680 customers were in the dark, but power was restored as of around 3:05 p.m.

The outage began at around 12:30 a.m. and crews worked into the night to restore power for the affected buildings, which were bounded by 14th and 19th streets and Market and Larimer streets.

An additional section of buildings were without power on 15th to 17th streets between Lawrence and Champa streets, according to a news release from Xcel.

The restore power, crews had to inspect the underground system beneath the streets in the area, according to Xcel.