The pipe that will supply the heat pump, drawing water from the River Rhine in Germany, is so big that you could walk through it, fully upright, I'm told. "We plan to take 10,000 litres per second," ...

The 162 MW project is being developed by German utility MVV Energie. The system will use water from the Rhine river as a heat source and is expected to generate heat with temperatures of up to 130 C.