I have been derping around trying to find a way to use big reactors because thermal expansion cables don't exist and Mekanism ones aren't working. Please help!

Have you tried EnderIO's energy conduits?

they are sadly not appearing :( i tried bc pipes, mekanism cables (both), IC2, an obviously TE doesnt have it

Which versions of Forge, BR and Mekanism are involved? When you say they "don't work", what do you mean? Do they not visually connect, but still conduct energy? Do they visually connect, but do not conduct energy? Do they neither visually connect nor conduct energy? (Screenshots are helpful.)

No new information in over a week; closing as nonrepro.