Cities are responsible for three quarters of the world’s energy consumption and 80% of CO2 emissions. Currently they are home to 50% of the world population, but by 2050 they will house 75% of it, implying a dramatic increase of energy consumption and CO2 pollution. To counterbalance this, new technologies appear in the horizon which may provide the needed solutions. Information technologies first revolutionized the information technology sector, but now they are stretching to all economic sectors, and energy is not left behind. Temperature and air quality sensors, variable speed drives and robots, smart meters and intensity and colour controlled LED lighting are among the numerous innovations that help save energy thanks to the advances in the digital world. The article predicts that the energy-use revolution will be led by the consumers just like the IT revolution was driven by the users of blogs, social networks, etc. The new technologies will allow energy self-production and customisation of energy usage, and at the end it will be up to the customers to implement and benefit from these. The increasing number of sensors and their networks will create useful data, which will serve to optimise the current use of resources and allow for more new services and products to be developed for consumers.
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