Dave Elliott: Around the world, cities are beginning to think in terms of meeting their energy needs from renewable sources, to limit air pollution and climate change problems. Over 100 cities now claim to get at least 70% of their electricity from renewables, compared to 42 in 2015, and many more are aiming for high proportions, as part of a drive to “100% renewables”. With cities responsible for over 70% of global carbon emissions from energy use, that is to be welcomed, but it’s worth being a little clearer about what’s meant by “100% renewable” cities. It won’t be easy for cities to get to 100% renewables, with transport probably the hardest issue to deal with, but technologically, it does seem possible to think in terms of renewables, from a range of sources and locations, supplying most of the energy needed by cities. I have written a chapter developing the ideas above for a new book Sustainable Cities, out next year.
Physics World 24th Oct 2018 read more »