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(WBIR) Single-digit temperatures made people crank up the heat Friday morning, causing Tennessee Valley Authority to meet a record-breaking winter demand for electricity.

Homes and businesses across TVA's seven-state region used an estimated 33,345 megawatts this winter - the highest demand for electricity since the summer of 2007 and the third-highest in TVA history. The previous winter record was 32,572 megawatts set on Jan. 16, 2009. TVA's all-time peak demand record remains 33,482 megawatts, set on Aug. 16, 2007, when temperatures averaged 102 degrees.

On Thursday, TVA asked all customers to voluntarily reduce electric use through Friday afternoon. The company posted the alert on its Twitter feed, saying any reductions could help them serve everyone through the frigid temperatures. Despite the cold weather, TVA ensured consumers that its system remains secure and stable. TVA has now lifted appeals to conserve energy.

"For the second time this month, TVA sincerely thanks everyone across the seven-state TVA service area for conserving energy and helping us provide a safe, reliable flow of electricity during this latest cold wave," said Tim Ponseti, vice president of TVA Transmission Operations and Power Supply, in a release. "The effort made by our employees and customers during this round of bitterly cold weather exemplifies the teamwork and skill required to provide low-cost, reliable power."