The aim of the DUET project is to develop energy management systems in cities by developing, testing and disseminating tools supported by information and communication technologies. The project will analyze the possibilities for more effective energy monitoring and management in the City of Bydgoszcz, and then improve the current energy data collection system introduced in 2020. Other cities (especially those in the Bydgoszcz Functional Area) will be supported in developing their own management systems by participating in the process of testing the best solutions and building a knowledge base. This will also be achieved through the exchange of experience and dissemination of knowledge among local government units and experts.