The READY4SmartCities (R4SC) project examines the adaption of Information and Communication Technologies (ICT) in energy systems, in order to improve their sustainability and energy efficiency in smart cities. This deliverable presents an innovation and research roadmap, suggesting the development needs of ICTs in short, medium and long term for the holistic design, planning and operation of energy systems. The focus is on large energy systems at the city level: centralized and distributed energy systems with connections to both national level energy systems and to the neighbourhood and building level energy systems. The roadmap is divided into five roadmap sections: citizens, the building sector, the energy sector, municipality and energy data. Each roadmap sector introduces drivers, needs and requirements, visions, barriers, expected impacts and key stakeholders. In the following, the goals of the different roadmap sections are specified from the viewpoints of key stakeholders. The role of ICTs and energy data in enabling these goals is also identified. The involvement of citizens in decision making related to energy aspects should be increased. Citizens should take an active role in the operation and use of energy to improve their energy behaviour. ICTs could help citizens to improve their energy behaviour by making them aware of the impacts of their actions. Buildings should become connected objects operating actively with energy networks and are optimized to balance the energy behaviour and thereby maximize the comfort of the inhabitants. Efficient energy use and on-site renewable energy production in the buildings is expected to be of high importance. Buildings could also be able to act as energy providers. This requires the smart use of data from the built environment, energy grids, the weather etc., implying that interoperability is ensured at different levels. The energy supply in cities should rely both on distributed and centralised energy production with using many renewable and local energy sources. Cities would become large power plants and virtual storage, reacting flexibly on the availability of renewables. ICT standards are needed for the communication between all the energy systems. Municipalities should foster the integration of different city systems to maximize their synergy impacts. Efficient energy use and supply could be realized through appropriate decision making, energy planning, development projects and daily operation within cities. Energy supply and use are integrated to other city operations with various ICT solutions. Access to open energy data would enable the sharing of cross-domain data between different stakeholders, leading to the consolidation of energy-related knowledge in cities. The use of energy data would also give the stakeholders a holistic view of the energy systems. The repeating theme throughout the roadmap is a strong need for broad collaboration, communication and interoperability within all the stakeholder networks. This requires the standardisation of both interfaces and systems themselves, to enable cross-organisational operation.