Whenever a put any that gives energy in a slot it just loses it all and doesn't power the thing 
[Support Request] Energy
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Stop giving yourself Crystals with TMI/NEI/Creative mode.
In a less possible scenario updating from 1.4x to 1.6x changed the way energy is stored in the crystals so they start at 0.
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Wish it worked now.
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Actually Creative Mode will work with spawning items with full charge. There is two diferent versions of the Powered Items in the Creative Mode List, one depleted (without a bar) and one with a full bar. The full bar items WILL work.