Nuclear power
Nuclear power, also known as atomic power, was a technology widely used in Earth naval vessels during the late 20th century.

This fact was stated by Spock upon the arrival of the HMS Bounty to 1986, with regards to the need to repair the ship's dilithium crystals. This led the crew to discover the aircraft carrier  for what they sought, as it was powered by nuclear reactors. ()

Early Human colony ships were nuclear powered. They were used to colonize the Solar System prior to the invention of warp drive. ()

While discussing planet 892-IV on the bridge of the  in 2268, Spock noted that the planet had no sign of atomic power. ()

See also
Nuclear fission
Nuclear fusion
Nuclear energy

External link 

Propulsion technology
Energy technology