The paper reveals the problems of management organizing of functioning and development of smart metropolis (Smart City) integrated with the power supply system. A lot of attention is paid to ways of solving these problems through the implementation of Smart Grid technologies and practices taking into account the SoS (system of systems) approach. In the context of this research work, the Smart Grid is considered as one of the first SoS subsystems of the Smart City. A concept of a new electrical network is also presented in the paper. This electrical network has qualitatively unique characteristics of adaptability, stability, and throughput, allowing to ensure reliable and uninterrupted power supply to consumers in the new conditions of rapid and stochastic changes in generation and consumption volumes, as well as the multidirectional nature of information and electricity flows (from the consumer to the network).