AFSU

The Advanced-Functional Storage Unit, or AFSU, is a Tier 5 energy storage unit that stores EU (IndustrialCraft 2). The AFSU is capable of storing 1,000,000,000 EU and outputs 8192 EU/t from the dotted side. It can be safely removed with a wrench without needing lossless mode, as there is no chance of it turning back into a Basic Machine Casing.

Alternate Textures
Originally when the mod was released, many users didn't like the AFSU's original texture. Therefor, some users provided new textures, and in the next major version a config option was added so others could use alternate textures without needing a resource pack. To change the texture of the AFSU, you must open the auto-generated config and change "AFSU Texture" 's value from "default" to either blue, yellow, black, old, chloe1, chloe2 or chloe3. It is case-sensitive; make sure not to accidental type anything in capitals. Then, you must restart the game to see your changes.