In sky factory you either have RF/FE or GridPower, so as long as you aren't using GP generators you'll be fine. How are you connecting the power? Conduits work fine.
This happens with Refined Storage crafters as well in 3.0.15, nothing to do with Reborn.
Vibrant Jetpack also complains that Energetic is missing once manually crafted and put into RS system.
Refined Storage: 1.2.26
Simply Jetpacks 2: 2.1.3.55
Generic Button does not seem to help hmm in default launcher or MultiMC I can alt+tab plus hold button and close menu and it fixes it.
Edit: To fix follow this and install http://sourceforge.net/projects/java-game-lib/files/Official%20Releases/LWJGL%202.8.4/ (perhaps newer versions work but...
Same issue, my fix for MutliMC or default launcher is to ALT+TAB hold mouse button then click return to game whilst holding mouse button.
The 'fix' does not work on FTB Launcher.
Edit: To fix follow this and install...
Yes I did.
MCPC+ Legacy L17 (fixes MiscPeripherals and other chunk loaders not loading and dodgy portals to nether/twilight forest)
Multiverse Core
Multiverse Portals
Multiverse Inventories
Odd mix of new and old builds but seems to work ok.