The final reactor can be abused in such a manner that it can fill up the highest tier energy storage (with the limit being as high as the range of the long data type) in a bit under a minute. Then again, even if we did manage to convert that into EU, I’m not sure if there’s a voltage tier high enough to actually use most of it.
Just for comparison, the lowest tier generators start at 1kHE/s with the larger earlygame ones being 30kHE/s, the first nuclear reactor being somewhere in the magnitude of 100kHE/s, optimized oil setups (which require a giant refinery) being above 1MHE/s, RBMKs easily going above 10MHE/s and the fusion reactor being somewhere above 100MHE/s. I guess that means if GT machines start in the single digits, then the ratio would be something like 50:1 or 100:1? Or would it make more sense to adjust the ratio based on voltage tier? I’ve never properly used GT reactors so I don’t really have a concept of how powerful they are.