Board Thread:Questions and Answers/@comment-5967960-20130108155259/@comment-5627887-20130709185322

It unfortunately couldn't be brought to any newer Tekkit even if the team that made it wanted to, no one is developing the mod EE2 anymore so it wouldn't work with the newer base versions of minecraft that most current modpacks are based on. Even Tekkit Lite has fallen behind due to RedPower2 and IC2 not being properly maintained, so it's stuck forever as it is now.