At a coal-fired power plant in Alabama last year, federal officials sat down with a security guard to discuss a serious breach of protocol. The guard's interview with the Office of Inspector General agents did not go well. They issued a report to their bosses at the Tennessee Valley Authority, the government-owned corporation that provides electricity to much of the southern United States. The security contractor was fired. His offense? Plugging a USB stick into a TVA computer at a checkpoint in the Widows Creek power plant.