IDAHO FALLS, Idaho -

Rocky Mountain Power says power was restored to about 4,500 customers in southeastern Idaho Thursday morning after an overnight outage during which temperatures fell below zero.

The company says power was restored shortly after 8 a.m. for customers in Ashton, Rexburg and St. Anthony.

The National Weather Service reported the temperature in Rexburg at 7 a.m. was minus 7 degrees.

The Fremont County School District canceled classes Thursday due to the outage while the Teton district canceled classes due to the cold weather.

Repair work being done at a Rocky Mountain Power substation near Firth on Wednesday caused about 70,000 people in southeastern to lose power for some portion of the day, including customers of Idaho Falls Power and the Fall River Electric Cooperative.