Radioisotope Thermoelectric Generator

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.