The Elite Energy Cube is a machine added by Mekanism. It is the third tier of energy cubes. It can store and output more energy than the Basic and Advanced Energy Cubes. It can be used as a charging station for items. The next tier up is the Ultimate Energy Cube.
In addition to the cables from Mekanism (e.g., the Basic Universal Cable), the cables of all supported power systems can also be connected, such as the Cables from IndustrialCraft 2 (e.g., the Copper Cable), the Fluxducts from Thermal Dynamics (e.g., the Leadstone Fluxduct), and the Kinesis Pipes from BuildCraft.
Right-clicking on the block open the Cube's GUI, which shows the internal storage.
Inside the minus slot the player can place other loaded energy cubes to charge the Elite Energy Cube.
The upper-left button (called "Side Config") opens the configuration of the cube, where the player can set which side should receive or emit energy. If a side is disabled, the center of the side is transparent and no cable connects on this side. If the player holds the Configurator in their hand, the Cube displays a color code on the side the player is looking at. Grey means "Off", red means "Output" and blue means "Input". With a shift-right-click the player can change the configuration of each side.
The lower-left button the player can change the displayed energy system between Energy Units, Redstone Flux, Minecraft Joules, and Tesla. The change only affects the display; the energy is still available in all forms inside the system.
The upper-right button configures the access rights for this block.
The lower-right button configures the Cube's behavior to Redstone. For example if the option is set to "High", then energy is only released when a redstone signal reaches the cube.