In SupremeEdition the energy network is the framework that handles all energy in the world, it consists of a number of interfaces and a number of classes that extend the minecraft base classes to include the default behavior for various different devices.
the total amount of energy in an isolated system remains constant over time (is said to be conserved over time). A consequence of this law is that energy can neither be created nor be destroyed: it can be transformed from one form to another or transferred from one place to another.Source
All items and blocks (from this mod and vanilla minecraft) have a energy value, This represents the total amount of energy this object is worth.