Well...
You take uranium or plutonium i think. Nuclear rocks.
And turn them into rods. Then when you stick them in water, close to some other energy emiting thing, it makes blue light.

This somehow boils water which gets pressurized and sent through a turbine that turns and makes power.

Sometimes it explodes.
You need scientists and engineers to make it work.
Its really efficient at making clean energy.
You need giant cooling towers.
Chernobyl exploded.

I think thats all.