The climate change represents an opportunity to revolutionize the urban planning paradigms, turning the role of the cities from massive producers of carbon emissions into a more sustainable built environment through the exploitation of renewable energy sources (i.e. solar). The contribution of this work is twofold: i) providing an interoperability approach for a solar cadaster for the municipality of Trondheim (Norway), located at high latitude; ii) exploiting the use of the solar cadaster to identify the most usable rooftop areas for solar systems’ installations and as supportive instrument for public and private stakeholders to facilitate decision-making for urban energy planning.