“Not If, But When”: Preparing for a U.S. Power Grid Failure The notion of a complete or large-scale power grid failure in the United States might sound like science fiction—or conspiracy theory. But experts in national security, cybersecurity, and energy infrastructure warn: it’s not a matter of if the U.S. power grid will experience a significant failure, but when. In recent years, weather events, cyberattacks, aging infrastructure, and supply chain…