East Tennesseans are still waiting for answers after the Tennessee Valley Authority had to implement rolling blackouts over the Christmas weekend. The blackouts came amid the worst freeze the state had seen in years and left several thousand without power.

Rep. Tim Burchett sent a letter to Jeffery Lyash, TVA CEO, Tuesday, asking for answers.

“TVA appears to have been caught completely flat-footed, which resulted in service disruption for thousands of Tennesseans and other residents within the TVA service area,” Burchett wrote. “I hope you agree that this is unacceptable.”