MMRTG was built with the support of the US Department of Energy (DOE) Space and Defense Power Systems Office. It is not a nuclear reactor but a nuclear battery. Specifically, it produces 110 watts of power through the natural decay of the 钚-238 radioisotope in eight general heat source (GPHS) modules.

Most of this heat is converted into electrical energy through thermal conductors, powering the Rover's experiments, electronics, robotic arms and wheels. At the same time, excess heat is directed to keep the spacecraft warm on cold Martian nights.

The US space mission has used more than 27 nuclear power systems, of which MMRTG is a relatively recent innovation, first installed on NASA's Curiosity Mars. Although the production of isotopes has been restarted, there are still enough cockroaches in the United States to build two MMRTGs after the Mars 2020 Mars, but these have not been allocated.

NASA said the US Department of Energy will complete the launch date in July 2020, when the rover will be launched from the Cape Canaveral Air Force Base in Florida. The rover will then land on February 18, 2021 in the Jezero Crater in the Mars Syrtis Major area.