Quick question: would there be any demand for power generating swimsuits?
It is an intriguing idea. I think there might be if you do it right. For instance if you combine it with a diving helmet that can draw power from it that gives air and light (it's so dark in deep water, for instance when building under-water power farms).
Also why not make the system a bit broader - have some machines that are intended to work alone and need lots of free water, and some that can be built closer together.
Finally if you want the system to be sucessfull and competetive, for instance against solar power the generated power should be somewhat comparable - for instance I would assume that while a lv watermill would give less power than a low voltage solar panel (which gives 8 eu/t) in the end what you would get after a full day and night should be somewhat comparable and take a comparable amount of resources. With comparable I don't mean the same, just that it should not deviate hugely and thus keep the whole system balanced.
Also, when it comes to swimsuits:
I'd consider intruducing two sets. A basic one thats easier to build, and another one thats more end-game like and is more on the level of iridium armor or even the gravitation chest plat. Of course it would not work as well above ground but work better under water, so as mentioned, a helm for air and light, a chestplat for energy and protection "boots" for faster swimming....
But before this all, please look into the current generators which are buggy and always give maximum energy.