Heidelberg is a small to medium-sized city in Southwest Germany. Between 2012 and 2017, the city’s population grew from 138,000 to 150,000 people. In order to accommodate the population growth, in 2008 the city of Heidelberg began to convert land once occupied by a railroad terminal into a modern green district. The area, known as Bahnstadt Heidelberg, has a maximum capacity of 12,000 persons. Energy- efficient and smart street lighting concepts were one of the central elements incorporated into the development (Heidelberg Bahnstadt 2014).
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