I have been researching for almost 3 hours, and as far as I can tell there is NOTHING that generates FE energy that is compatible with turret, I tested MC Flux and Energy Converters. They don't work even though they say they generate FE energy.
since you guys made the mod, can you find a mod that works, or at least re-add the config for power requirement, as it is not there in the version I'm using, 1.12.2-2.0.1.2

Turrets can be powered and no power config option is in the config file.

In other words I think that using a energy type that either isn't already provided(like redstone), isn't in the mod, or isn't easily accessable is stupid.