Issue description:

SPS will take and consume an arbitrary amount of power given to it regardless of polonium feeding rate as long as it's active.

Steps to reproduce:

1. Build an SPS.
2. Provide it with, say, 1 mB/t of polonium by running a fission reactor at 10 mB/t burn rate.
3. Give it however much power you want by any means
4. Observe the SPS consuming (and therefore waste) all of the power provided even though 1 mB/t of polonium is supposed to only take 1 MJ/t.
   Ω. Is this intended?

Version (make sure you are on the latest version before reporting):

Forge: 1.16.3 - 34.1.42
Mekanism: 10.0.17.444
Other relevant version: Valhesia 3 modpack

Yes this is intended, the SPS will use all the power you throw at it.