Renewable energy generation technologies on urban scale

Expectations against environmental degradation, including future effects of global warming, require changes in the way how the city is conceived. As an essential, is necessary that public policies and organized planning to consider concepts related to energy supply with the resources that have the cities. Given the enormous pressure of the cities on the environment, the proposed changes are in fact an opportunity to promote sustainability. In a previous study, eleven technologies that use resources available or that come from the cities was determined. It was established that with the widespread use of these technologies, it possible reduce flows from energy carriers that require a city. These energy carriers may be electricity or fuel, and are used for producing heating, power, lighting or data process. Of the technologies described, eight can be used for electricity generation: biomass, biogas from digester, biogas landfill, waste incineration, tidal, wind, small hydro and photovoltaic. The possible use of one or other technology depends not only on the existence of the resource. Is necessary, take in count, technical, economic, social or environmental factors. This research proposes to use multicriteria techniques to analyze holistically the most appropriate option for promoting energy renewable in a particular city.