Extreme Reactor energy generators are, by design, not tied to any particular power system that exists today in the world of Minecraft.
Energy is generated and then converted on the fly by the Power Taps when it is extracted from the internal energy buffer.
The Power Taps installed in your Reactor or Turbine define the output energy system of the machine.
Currently, the mod comes with a Forge Energy Power Tap that sends out Forge Energy units.
Other power systems can easily be supported by adding new types of Power Taps.