Redstone Flux, often referred to as RF, is the energy system used by the mods of Team CoFH. As described in Redstone Flux: A Primer, it is an extension of the redstone power system.
Various blocks and items in the CoFH mods consume Redstone Flux energy to accomplish all kinds of tasks. Redstone Flux is usually consumed for one of two reasons:
The CoFH mods offer various ways to produce, move, store and consume Redstone Flux, such as Thermal Expansion’s dynamos and energy cell, and Thermal Dynamics’s fluxducts. Many other mods also add devices that work with Redstone Flux.