Um Reator Hypermatter . Assim como Star Destroyers e outras embarcações imperiais, mas maiores (obviamente).
Many of those present were researchers and scientists involved with various aspects of the battle station project — the drives, shield and tractor beam technology, hypermatter power plant — without a full understanding of what they were working on.
Catalyst - Chapter 8: Public Displays of Affection
(ênfase minha)
O superlaser foi acionado por meio da tomada de energia do reator de hipermatéria e do foco nos cristais de kyber.