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(WBIR) Thousands of people were without power overnight, as temperatures hung in the single digits.

The bitter cold temperatures caused many people to crank up their thermostats, and the increased demand cut power to customers across the area.

LCUB, KUB, and Alcoa Electric worked through the night to restore power to customers.

Tuesday morning, the general manager of LCUB said operations were back to normal.

Earlier, LCUB said customers lost power from TVA due to the high demand as temperatures dropped. The electric company's general manager said LCUB and TVA engineers were quickly able to locate the problem and re-route power.

The majority of LCUB customers had their power back on in about an hour. Travis Brickey with TVA said a static line on the top of one of their larger power lines also broke and fell, knocking out power to some LCUB customers. LCUB also had a problem at a Lovell Road substation, which cut power to some people as well. Throughout the early morning, power was cut to some customers while crews re-routed power.

At one point Monday night, KUB also reported they had more than 3,700 customers without power. As of 1 p.m., KUB outages dropped to less than 100.

MORE : KUB outage map

Alcoa Electric also worked through the night to restore power. The company said power had been going on and off in the Walland and Seymour areas because of the increased demand.

Volunteer Electric said 1,500 customers were without power Tuesday morning. The company serves McMinn, Meigs, Roane, Cumberland, and Fentress counties.

Powell Valley Electric told 10News 3,000 customers were without power Tuesday morning, affecting 1,500 customers in both Claiborne and Lee counties.

Fort Loudoun Electric said 79 customers did't have power.

MORE: Fort Loudoun Electric outage map

Appalachian Electric reports no major problems, but TVA told them to reduce power usage.

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