As the sun dips and the city’s streets are plunged into darkness, you can almost always count on the glow of street lights to provide a sense of safety until your final destination. Yet with over 230 million street lights around the world in use every single night, the total energy consumption certainly adds up. In fact, roughly 40% of a city’s total energy costs can be traced back to its street lights. For this reason, street lights have become the entry point for smart city technology adoption, and will continue to be the source of innovation for cities around the world.