|Interdimensional Energy Storage Unit (IDSU)|
Unlike EU storage devices, the IDSU has the ability to link to other IDSUs made by the same player. It works much like an Ender Chest, except with energy: If EU is added to one IDSU then that EU appears in all IDSUs made by the same player. This allows a power grid connected to an IDSU to power anything else connected to a different IDSU.
This device is very expensive and complex to make. To craft it, an Assembly Table is required as well as Iridium and Diamonds. One IDSU requires 4 stacks of Lapotron Crystals, 36 Iridium Plates and 4 GregTech-Computercubes. To use its energy transfer ability, you'll need at least two. Due to the extreme expense in both building and utilizing the IDSU, players are recommended to transfer energy using alternate methods. Solid and liquid fuel can be easily transferred using Ender Chests and/or Ender Tanks, while solid, liquid, or pure energy can be directly transported using Tesseracts.
Note that because the IDSU outputs in 2,048 EU/t packets (Extreme Voltage) the only kind of cable capable of handling this voltage is HV cable - lower tier cables will burn out and disappear. Alternatively an HV transformer can be used to step the voltage down to HV (512 EU/t) at which point Glass Fibre Cable can be used.
There is currently a glitch where clicking on the IDSU to check the recipe will crash the game. This is due to the Ender Chest from the Ender Storage mod having a different ID than the vanilla Ender Chest. The bug is fixed in the Ultimate pack, however.
This video explains how all of the GregTech storage devices work along with the Lapotron Pack.