Well, this is going to really hurt my mod pack... maybe even kill it. BC I can live without, but Railcraft provides a lot of the core functionalities in my mod pack. Tanks, Boilers, the different types of tracks... and I would think that CJ's own mod would use the new system he is implementing. I would hate to give that up, but I would feel that I basically had no choice at that point. I've also been dabbling around with Mekanism on a test instance to see how well it integrates with my mod pack for inclusing in 1.6.x, and other than a quibble about Heat Generators being the only generator that doesn't require steel, and energy is required to produce steel, it works quite seamlessly. I like the different energy generation options that Mekanism offers me, and I was strongly considering including it in my mod pack. If this does go through, I'm going to be torn... if KL sets up his own energy network, it's going to really split me. I'm trying to run a power network which works together seamlessly without needing additional conversion blocks. The primary reason I was considering Mekanism is that the power cubes, and I believe even there is even an energy cable, automatically translate into MJ, which all of my other mods use. You can hook up a Redstone Energy Conduit straight to the output slot of an Energy Cube and it'll run just fine. If that functionality goes away... well, I'll have to re-think which mods go in the mod pack, and make some really tough choices.