A gravity power station in China. The tower collects excess power from neighboring wind turbines and uses them to lift concrete blocks weighing 35 tons to a height of almost 150 meters. And when electricity is needed, the blocks are taken down and the generators are turned on. One "charge" is reported to be enough for 12,000 homes for 24 hours.

A gravity power station in China. The tower collects excess power from neighboring wind turbines and uses them to lift concrete blocks weighing 35 tons to a height of almost 150 meters. And when electricity is needed, the blocks are taken down and the generators are turned on. One "charge" is reported to be enough for 12,000 homes for 24 hours.