In my view, sustainable city is where the development is made in order to try to optimize the management urban. The sustainable city encourages the community participation through e-governance, which means smart government services more responsible, transparent and efficient through of sharing information. As a citizen, I like to participate in the problems of my city and smart cities are made by community participation, technology and good management. The smart city is reliable (safety), interactive (theaters, bars), pleasurable (parks, green areas), flow (transport) connected (technology) and agile (Feedback). For this happen, the smart city needs a good smart grid and this is the role that technology is doing . When you have all of these actions together managed correctly, you have Smart city = Sustainable city.