Currently, the HE to RF ratio is 1:4 which I believe should make it 1:1 with IC2’s EU (and by extension GT’s EU as well), although the original method of finding that ratio used a now deprecated generator and compared it to a similar one from Thermal Expansion, and it didn’t take into account all the later additions which means mid-game reactors like the RBMK are obscenely powerful compared to anything most RF-based mods have to offer. Since the output scaling of both mods as well as how fast one can progress through them isn’t really directly comparable, I can’t even properly guess what the ideal conversion ratio would be, or if it would even be a linear scale.
What complicates the whole thing is that I have a tendency to tear up and replace large chunks of code and who knows how long it’ll be until I rewrite the entire energy system (again), so a converter on GT’s side would probably break sooner or later. And I’m not sure if I could even add a converter to NTM because I don’t really know how GT’s energy system works (I kind of stopped playing before the steam age) and I’m hesitant to add more stuff to the build script (the builds keep getting slower with every dependency and should a repo go down I probably can’t even build it anymore) and all that assumes we figure out the conversion ratio first.