Rocket engines can produce gigawatts as jet power. Kerosene and liquid oxygen is a very dense energy source. A jet engine is slightly bigger as it needs to pump

Rocket engines can produce gigawatts as jet power. Kerosene and liquid oxygen is a very dense energy source. A jet engine is slightly bigger as it needs to pump air which is not very dense, but it's still much less complex than a power plant that has to generate electricity.