Duke Energy officials are asking customers to reduce electricity use during the next 24 hours to help avoid potential high-energy demand on the electrical grid caused by frigid temperatures.

The most critical time to reduce electricity usage is Thursday between 5 a.m. and 10 a.m.

“The forecasted conditions are very similar to those we experienced last January during the Polar Vortex, and are affecting a large portion of the country,” said Nelson Peeler, Duke Energy vice president of transmission system operations. “We currently have sufficient generation resources to meet our customers’ energy needs, but we know from experience that conditions can change quickly, and we need to be prepared.”