Fusion power.
A more powerful alternative to fission reactors (The kind currently in IC2...). Maximum generation of a current reactor is 2,400 EU, this suggestion could manage up to 5-7 times this figure. Nuclear engineering principles still apply.
(Going to try to illustrate... Bear with me...)
Plasma generators would be used to make the main fusion reactor.
Plasma generators would be made like this:
(The energy crystals represent Lapatron crystals...)
Created: 2 plasma generators.
The fusion reactor would be a simple upgrade of the basic reactor:
(The MFSU's represent plasma generators...)
Created: 1 fusion reactor.
For the fusion fuel cells, a hydrolysis machine (Upgrade of electrolyzer) would have to be made with an electrolyzer, 2 advanced circuits, & 2 refined iron. Like so:
Created: 1 hydrolysis machine.
(The advanced machine block represents the electrolyzer machine.)
To make the fuels cells, just put 
in, power & wait.
1 water cell becomes 1 hydrogen cell (AKA fusion cell...).
Next would be extreme high-voltage wire, made of mixed metal ingots capable of handling >2048 EU with minimal loss. Crafted like so:
Created: 16 wire.
Second to last would be a higher-capacity version of the MFSU made with extreme-voltage wire, 4 MFSU's, 2 transformer upgrades, & 2 energy storage upgrades. Needed due to power from reactor MAY overwhelm MFSU's. The upgrades can go in any corner, just the MFSU's & cable need to be like this:
Created: 1 EVSU. (Extreme Voltage Storage Unit.)
Lastly would be Extreme-voltage transformers.
Created: 1 EV-transformer.
(The MFSU represents a EVSU...)
