NASA's PROMISE Rover Will Run on Nuclear Power at Moon's South Pole

NASA has not named the power source model. The generators on Curiosity and Perseverance give a sense of scale: 4.8 kg of plutonium-238 dioxide produce about 110 watts of electricity at launch, for at least 14 years of service. Waste heat also keeps instruments warm. There is no chain reaction and no moving parts: decay heat becomes electricity whether or not the Sun is up, which matters at the pole, where nights last 14 Earth days and some craters never see direct sunlight.

Blue Origin will deliver the rover aboard its Mark 1 lander under a $94 million contract, with a performance option that could take it to $140 million.

Lessons from VIPER

The choice answers the fate of VIPER, a solar-and-battery rover meant to map south pole water ice. NASA cancelled it on 17 July 2024 after about $450 million had been spent, then revived it in September 2025 with Blue Origin, now targeting a 2027 landing. Its plan was capped at roughly 100 Earth days, whereas PROMISE is meant to last 18 months, lunar nights included.

The announcement comes amid a wave of contracts for the Moon Base programme, which aims for an operational base by 2032. Eight companies, including SpaceX and Blue Origin, will share up to $10 billion in lunar deliveries over ten years, and $1.3 billion in launch orders has already been allocated.

ESA's Argonaut lander is not expected before 2030 on an Ariane 64 and will first test lunar-night survival technology. The water ice map PROMISE produces will therefore weigh on where the base is placed. Water means oxygen and propellant that no one has to launch from Earth.