The Local Energy System (LES) is a functional set of IT tools – realizing demand and supply forecasting, balancing, load optimization, etc. – and integrated with them Smart Grid components designed to create on the basis of local energy resources and local transmission infrastructure located on a given area of integrated, autonomous energy systems that provides local communities with stable access to cheap electricity. The LES is also a set of rules and legal and financial instruments enabling the efficient functioning and development of such a structure based on local and external financial resources. The logic of the System’s operation is based on a layered architecture of a complex network, similar to the architecture of the Internet. The LES functionality fits perfectly into the concepts of Distributed Generation 0 and clean energy. The LES concept aims to help local communities create efficient energy cooperatives that are managed by them, helping them to achieve energy prosperity.