As early plans are plugged in for 2027’s meeting of energy innovators, we take a stroll around one of the continent’s most important green tech hubs. Arnhem’s Cleantech Park does exactly what it says on the tin. Spanning 90 acres on the edge of the city limits, flanked by the Nederrijn (the Dutch Rhine) and its tributary river, the IJssel, this innovation hub is home to around 130 companies pushing boundaries across a multitude of industries. B…