Electric companies were calling Monday for voluntary energy conservation by customers during the cold blast.
"We are running a very high-load demand," Kentucky Utilities spokesman Cliff Feltham said late Monday. "While it's not an emergency, they can surely help us if they would."
He urged customers to lower thermostats a degree or two, turn off lights in unoccupied rooms and take similar measures.
"A whole lot of those small things add up to a lot of megawatts," Feltham said.
Multiple power outages were reported throughout Lexington on Monday night. Feltham said most were expected to be repaired within a few hours.
The company that operates the power grid that supplies energy for more than 61 million people in all or parts of 13 states, including Kentucky, called for the public to conserve electricity Tuesday, especially from 6 to 9 a.m. and 3 to 7 p.m., because of the extreme cold.
PJM Interconnection said conservation efforts would help ensure adequate power supplies.