While in a dimension extracting the remaining energy out of it when it runs out of energy the game crashes.
Have a charged PFG highlighted in hotbar.
Have the the current realized dimension in inventory.

Minecraft 1.7.10
rftools 4.23
mcjtylib 1.8.1
Forge 10.13.4.1614
CoFHLib 1.1.2-182

http://pastebin.com/bPjxAMsm

I will check it out

Good news is it seems to be fine after reloading the world but crashes the first time a dimension runs out of energy repeatedly.
Edit: also maybe it has something to do with nei
was using NotEnoughItems-1.7.10-1.0.5.120 and CodeChickenCore-1.7.10-1.0.7.47 while testing.

Oh 1.7.10... I no longer maintain that version but also rftools dimensions were heavily used on that version and this scenario (running out of power) has come up a lot of times so I doubt this is a bug on rftools side