DEC decentralized energy system is the infrastructure of the entire ecosystem. Through DEC decentralized energy system, monopoly of the energy industry can be broken, price competition in the energy market can be formed, price transparency can be promoted, and interconnectivity between different energy regions can be realized. The most obvious effect is to realize dynamic price change and solve the problem of energy consumption through the intelligent energy system. The integration of energy and blockchain can promote autonomous transactions among users, reduce the burden of electricity charges, enhance the transparency and credibility of transactions, reduce transaction time, and improve the utilization rate of energy and other benefits through the establishment of inter-community renewable energy trading network based on the distributed ledger. In the future, in the process of continuous optimization of blockchain technology, it is bound to be able to establish a self-sufficient power supply for the residential power grid. In the future, it is not only people who need electricity to trade with each other but also electrical appliances, such as new energy vehicles and charging piles, robots and other chargers. New energy vehicles and charging piles, for example, are a typical energy transaction. We will give new energy vehicles and charging piles unique digital identities on the blockchain