The main weapon of death star was powered by kyber crystals, the same crystals that powers a Jedi’s lighsaber.
That said, the death star also needs power for various other stuff not only the planet destroying mega cannon, so it’s easy to assume there’s also a powerful power plant for powering rest of the station.
There was also 123 “highly radioactive” generators powering it’s propulsion system and hyperdrive.
The main weapon of death star was powered by kyber crystals, the same crystals that powers a Jedi’s lighsaber.
That said, the death star also needs power for various other stuff not only the planet destroying mega cannon, so it’s easy to assume there’s also a powerful power plant for powering rest of the station.
There was also 123 “highly radioactive” generators powering it’s propulsion system and hyperdrive.