This article makes clear the reason why Executive Order 14420 exists.
"The Department of Defense (DOD) has been the country’s largest electricity consumer for decades, consuming close to one percent of electricity nationally. It spends more than $16 billion a year on electricity and fuel, and close to $5 billion of that powers domestic installations. Almost none of that power comes from anything the DOD owns and controls. Alarmingly, no federal statute, regulatory rule, or state utility code requires a utility to restore or maintain power to a military installation ahead of an ordinary residential or commercial customer."
Executive Order 14420 excerpts of interest.
"(c) Â As soon as practicable, the Secretary, in consultation with the Secretary of War, the Secretary of the Interior, the Secretary of Commerce, the Secretary of Homeland Security, the Director of National Intelligence, and any other senior executive branch official the Secretary deems appropriate, shall:
(i)   identify bulk-power system electric equipment designed, developed, manufactured, or supplied by persons owned by, controlled by, or subject to the jurisdiction or direction of one or more Covered Foreign Entities that poses an undue risk of sabotage to or subversion of the design, integrity, manufacturing, production, distribution, installation, operation, or maintenance of the bulk-power system in the United States; poses an undue risk of catastrophic effects on the security or resilience of United States critical infrastructure or the economy of the United States; or otherwise poses an unacceptable risk to the national security of the United States or the security and safety of United States persons"
"The term “bulk-power system electric equipment” means items used in bulk-power system substations, control rooms, or power generating stations, including reactors; capacitors; substation transformers; utility-scale and other grid-connected inverters; battery energy storage systems; and uninterruptible power supply systems supporting critical infrastructure, current coupling capacitors, large generators, small generators, backup generators, substation voltage regulators, shunt capacitor equipment, automatic circuit reclosers, instrument transformers, coupling capacity voltage transformers, protective relaying, metering equipment, high voltage circuit breakers, generation turbines, industrial control systems (including remote terminal units, programmable logic controllers, and intelligent electronic devices), distributed control systems, and safety instrumented systems.  In determining whether equipment is within the scope of this order, agencies also may consider associated software and firmware, remote access capabilities, lifecycle maintenance and update mechanisms, and other supply chain dependencies that could present an unacceptable risk to the bulk-power system.  Items not included in the preceding list or that have broader application beyond the bulk-power system unrelated to the national security concerns identified in this order are outside the scope of this order."