Smart distributed energy is a combination of advanced power supply and information technologies that enable reliable and efficient management of circuit segments with distributed energy sources, electric energy storage systems, and controlled load. Smooth operation of such segments requires high level of unification and automation for such procedures as information exchange between participants of management cycles, optimal operation planning for equipment included into physical or virtual groups, clearing of financial transactions, etc. In order to meet such requirements with minimal time and labor, it is proposed to compose and operate applied control systems within the framework of a digital platform. The platform architecture is presented based upon reusable functional microservices, viz. small, loosely connected, and easily modifiable components with an open application program interface, that interact in a unified information environment. Applications that automate various business functions of smart distributed energy control are composed from calls to microservices, adapters of interaction with external systems, and graphical user interface. Algorithms are presented as part of the platform’s mathematical means, for automatic modeling and analyzing electrical modes, forecasting load/generation and external technical and economic factors, and solving optimization control problems. Procedures for composing and operating digital twins of smart distributed energy objects over the platform's data bases and streams are described.