Protecting critical infrastructure, and especially the U.S. Energy Grid is certainly a topic that keeps the U.S. Department of Homeland Security (DHS), The U.S. Department of Energy (DOE), The U.S. Department of Defense (DOD), and U.S. intelligence community planners up at night. The threats can be from cybersecurity attacks (by countries, criminal gangs, or hacktivists), from physical attacks by terrorists (domestic or foreign) and vandals on utilities or power plants, or from an Electronic Magnetic Pulse (EMP) generated from a geomagnetic solar flare, or from a terrorist short range missile exploded in the atmosphere.
The underlying reality is that from an energy frequency perspective, the aging U.S. Energy Grid infrastructure is extremely vulnerable to cyber-attacks, physical incidents, and existential threats.