If you take a schematic of a running windmill bearing and paste it down, the bearing will have the same power as if it had the sails, while not actually having the sails or needing them in the material requirements. This means that you can create obscene SU for dirt cheap by copying a 128+ windmill bearing. (I was able to get >3M from a 9*9 cube) You can also edit the nbt data of the bearing to produce up to 130K, which would allow you to get around 50M SU from a 9*9 cube.