Could you add compatibility with Less Unplugged?
https://mods.factorio.com/mod/LessUnplugged

If transparency is set to 100, it does make it invisible, but at 75 or 50, it doesn’t affect it.

Also, is it not possible to scale power icons given it isn’t affected by the scale option?

Also, I suggest you change the mod name. I’ve been wanting something like this for years but never used this mod as I thought it just made power icons inviisble. The title doesn’t suggest that you can make them transparent or that it affects non-power icons too.

The sprite has to get replaced entirely for the transparency settings - if anything else changes the sprite, as that mod does, it gets overridden, so these two mods can't really work together.

Similarly, power icons get reduced in size same as everything else so if that's not happening it's probably a conflict with the other mod.