The energy consumption of cities is an important carbon emission source, so it is significant to develop a high efficiency energy system for the whole city. This study proposes an optimization process of planning and operation for low-carbon city energy system. The process is divided into four steps：estimation of city energy demand, optimization of energy technology selection and operation, minimum energy station number optimization, and site and network optimization. Based on these, most parts of the flow are tested by the data from a local government, showing its practicability.
Keywords planning, operation, optimization, energy system, low-carbon city