Festo has developed a stormwater holding tank solution that is energy self-sufficient. Solar and wind energy are used to generate and store electricity. The energy is used to power a control unit and operate pneumatic actuators. If the power supply from one of the energy sources fails, a built-in emergency function ensures that the gate valves can continue to be operated several more times until a repair or replacement has been carried out. Using a Festo GSM modem, the entire system can be controlled and monitored from a remote control center.