As a hot topic

the Energy Internet is interpreted differently from field to field. This paper generalizes the essence of the Energy Internet as a technology of networking energy integration (NEI)

with the smart grid designated the central backbone of the Energy Internet. A framework in terms of three layers for the Energy Internet is proposed

and the concept of cyber physical system is extended as cyber

physical and socioeconomic (CPS) system. The paper sums up the critical technologies for NEI as a unified and equipotent node model

energy integrator

operation and control under the conditions of NEI

as well as life-cycle management of energy.