A radioisotope thermoelectric generator, sometimes referred to as a radioisotope power system, is a type of nuclear battery that uses an array of thermocouples to convert the heat released by the decay of a suitable radioactive material into electricity by the Seebeck effect.

The multi-mission radioisotope thermoelectric generator is a type of radioisotope thermoelectric generator developed for NASA space missions such as the Mars Science Laboratory, under the jurisdiction of the United States Department of Energy's Office of Space and Defense Power Systems within the Office of Nuclear Energy.

An automotive thermoelectric generator is a device that converts some of the waste heat of an internal combustion engine into electricity using the Seebeck Effect.