Radioisotope Thermoelectric Generator have been used as electrical power sources in satellites and unmanned remote facilities like a series of lighthouses built with the former Soviet Union inside the Arctic Circle. RTGs tend to be the most attractive power source for unmaintained situations that need a few hundred or so watts of electrical power for durations time for fuel tissues, batteries, or generators to provide economically, and in places where solar cells are not useful.
Radioisotope Thermoelectric Generator
