Eco Towns in Japan are a 20 year-old reality. They are towns based on the principle of a sound material-cycle society; they were also an experiment for enviromental technologies and fostered the development of the eco-business. In the last 20 years a lot of smart sustainable cities have been created around the world: cities which are particularly concerned to the environment, by reducing the carbon emissions, recycling, using renewable energies etc. Recently, in 2014, a Smart Sustainable City financed by Panasonic was created in Fujisawa, Japan. The city is a 1000 houses’ community with rooftop solar energy, solar-power street lights, LED lighting, electric cars and bikes to borrow etc. This one year-old is coming to Denver. The article explore how the project will be beneficial for the community, how it will be put into practice and how it will differ from the Fujisawa’s project.