Putting this one first so people see it. You need this for any mod of power crystals to work. Place in coremods, not mods.
In particular, all of my mods built on this now have update notification! You can disable this if you wish in PowerCrystalsCore.cfg.
Download PowerCrystals Core for Minecraft:
For Minecraft 1.6.4
For Minecraft 1.6.2/1.6.1
For Minecraft 1.5.2
For Minecraft 1.5.1