Most mods have an Energy system that only works with that mod. However, some energy systems are cross-mod compatable.

Galacticraft Aluminum Wire Energy Storage Generators Solar Panels Energy Beams	Buildcraft Engines Kinesis Pipes	Applied Energistics Energy ME Cable
Railcraft Charge Energy Charge Shunting Wire Batteries	Project Red Energy	Industrial Foregoing Energy Machines 1 Energy Machines 2