Could a U.S. carrier temporarily connect to and power Cuba's electrical grid?
Short answerIt could likely assist a local area during relief operations, but it would not meaningfully power the whole Cuban grid because of compatibility and distribution limits.
NotesA carrier could support a localized shore area if the right transformers and frequency-conversion equipment were available. U.S. carrier disaster-relief stores are described as including equipment for linking ship generation to shore systems. Havana or another nearby demand centre might receive useful emergency power, but transmission losses, incompatible frequencies, and long distribution distances rule out energizing Cuba's entire grid. Sailors' hotel load is only a small fraction of a warship's generation demand, so the ship does possess meaningful spare capacity when combat systems are not consuming it. A carrier is therefore a powerful local relief platform without becoming a substitute national power station.