The US space agency needs new types of batteries that will provide astronauts with energy during multi-month space missions. It therefore offers $ 250,000 to any company that is able to offer a sensible alternative.
NASA wants to send missions much more than just the Moon in a few years, so it needs a new type of battery that will provide energy for much longer missions.
Current lithium batteries and hydrogen cells are not able to store enough current to use them for several months, so you need to develop a completely new type of battery that is much more efficient than the current one.
The space agency is primarily aiming to reduce the number of liquid fuel-based batteries that are costly to put in space. Some vehicles already use solar energy to produce the current needed to power the instruments, but the current solutions are not effective enough for major applications yet.