You know , the maximum number in computer ( or at least in minecraft ) is 2.1 billion , so the maximum EU storage is that ( twice a IDSU) . If that is not enough , than mod can't help , unless they change the format .
Indeed , teloporter will use up a lot of energy when tp 10000 blocks away ( I think 2-3 million ) . If you use some crazy overclocked macerator , it consume 6000 per operation / per tick .The industrial blast furnace take quite a bit (200k per operation). I know , those are just nothing compare to IDSU . Indeed , there is no sense to make anything with such large energy consumption . Note that a coal is 4000 only , IDSU is 250000 coal .
But still , I get a few suggestion , if that make any sense . Anti UU matter producer . anti UU matter can make anti anything that UU matter can , if combine the anti and normal one ( craft) , there will be a nuclear explosion . Just for fun , no use indeed .
Create a ultimate weapon , consump maybe 1million EU per use , and than it have a looting 40 , sharpness 40 in it . Again , just for fun .
Item duplicater , consump 4 or 5 billion EU to duplicate any items ( obviously once). Well , that much EU into UU matter is just more than enough, just save the time for crafting , fighting bosses etc.
Make a industrial version of uncrafting table , takes 3 million per operation , ok for machines .
Make a 20* speeded industrial certifiger , consume 1000* EU . Quatumn macerator , furnace which instance finish with 1m EU( for those who a lazy to wait even one tick)