Class was canceled on Monday at three Denver public schools and six Boulder schools due to Xcel Energy power outages after the weekend’s extreme winds.

John F. Kennedy High School, Rocky Mountain Prep Ruby Hill Elementary and Traylor Academy Elementary were all closed Monday, according to an early morning announcement by Denver Public Schools. The Boulder Valley School District also temporarily shuttered six schools on Monday: Nederland Elementary, Nederland Middle-Senior High School, Gold Hill, Jamestown, Platt Middle School and Coal Creek Elementary School.

RELATED: Denver metro area school delays, closures for April 8, 2024

The news follows the utilities company’s Sunday prediction that it could take through Monday or longer to restore power to more than 87,000 Xcel customers statewide who were still experiencing outages by 5:45 p.m. on Sunday.

As of 8:50 p.m. Monday, about 600 outages were reported by just under 9,000 customers in the Denver area, according to the Xcel electric outage map.

A total of more than 150,000 were impacted by the loss of power — severe weather caused outages for around 100,000 customers, while another 55,000 in six counties had their power shut off by Xcel in an effort to prevent wildfires.

“For the first time in Colorado, Xcel Energy conducted a public safety power shutoff,” said spokesperson Tyler Bryant in a Sunday statement. “While many customers will have service restored later today, with the significant number outages from this weather event, this restoration process will extend into Monday, April 8 and possibly longer for some customers.”

With more than 400 crew members working on restoring power to more than 600 miles of affected lines, the company had addressed the needs of about 63,000 customers by Sunday evening.

Because Xcel changed its system settings during the extreme winds to restrict automatic power restoration, “this safety measure means power outages are likely to last longer than they typically would,” Bryant said.