Sustainability is an important aspect of smart cities as they seek to improve efficiencies in urban areas and improve citizen welfare. Cities offer many environmental advantages, such as smaller geographical footprints, but they also have some negative impacts, including the use of fossil fuels to power them. However, smart technologies could help alleviate these negative effects, such as through the implementation of an electric transport system to reduce emissions. Electric vehicles could also help to regulate the frequency of the electric grid while not in use. Such sustainable transport options should also see a reduction in the number of cars in urban areas as autonomous vehicles are expected to reduce the need for car ownership amongst the population. Creating such sustainable solutions could deliver environmental and societal benefits.