The increasing population living in cities is leading to higher resource utilization, which strains the cities' ability to focus on sustainability. Adoption of different technologies can transform cities into "smart cities" that utilize energy in a more efficiently. This paper presents results from a technology assessment tool developed together with six mid-sized European cities. The main areas of focus have been evaluated based on the cities' priorities: transportation (both public and private) and consumers' perspectives on the use of smart electricity meters. The use of electric vehicles in Sweden, and a techno-economic evaluation of biogas-derived biomethane and electricity use in public transportation have been analyzed. The main conclusions show an overall higher efficiency for biogas-derived electricity use in electric buses; a need for higher consumer engagement through more detailed information provision for both increasing EV market penetration and electricity savings; and a need to establish detailed technology assessments for successful technology adoption in cities. (C) 2016 Elsevier Ltd. All rights reserved.