In the latest version of Tekkit Main, Thermal Expansion 3 is used. Since Industrial Craft is no longer part of the Tekkit Main modpack, TE is set up to takes its place with many machines that help make your Tekkit life more enjoyable.
Making it's debut in this release of TE is a new form of energy called Redstone Flux (RF). I know what you're thinking, "What? Another type of energy? Ugh!...." When I first heard of it, I said the same thing, but in all actuality, the modders for TE really thought this through and RF may end up being the energy type that all mods eventually switch over to.
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