Note: This story was last updated at 12 p.m.

Mandatory rolling power blackouts continued in Oak Ridge and across the region Saturday morning. The City of Oak Ridge announced at about 11:40 a.m. Saturday that the power outages had been terminated.

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The blackouts will affect 10 percent of customers at a time, and power outages will last about 30 minutes, the City of Oak Ridge said in a press release. That’s a larger percentage of customers who will be affected by the Saturday outages than the ones on Friday, when about 2 percent of Oak Ridge customers were affected.

The Tennessee Valley Authority, which provides power to the City of Oak Ridge, said the blackouts are necessary because of the extreme weather conditions, according to the press release. The power demand is high as temperatures have dropped into the single digits in what has been called a “once-in-a-generation” storm.

TVA said the power demand is among its highest in its nearly 90-year history. Typical power demands for December are around 24,000 megawatts. On Friday, power demands surpassed 33,000 megawatts, TVA said.