A microfusion generator is a form of technology that was essential in the lives of the Enarans during the 24th century, on par with a communications interlink.
Jareth once noted to his daughter Korenna how hard it was to relate to the Regressives, a group on Enara Prime who use little more than the most primitive technology including such luxuries as microfusion generators or communications interlinks. (VOY: "Remember")
In the Federation, microfusion generators were found aboard Template:ShipClass starships. While initiating the impulse pre-start sequence, it is necessary for the microfusion generators to be on line. (DS9: "The Changing Face of Evil")