Harnessing energy from falling rain has the potential to generate huge amounts of electricity. If rain falls into a tube connected to a circuit, the individual plunks of raindrops will produce more charge than continuously falling water. That same effect could soon generate massive amounts of electric power with rain. It can be used anywhere, including in urbanized areas.”Previous experiments had tried to use water flowing through nanoscale tubes to capture electric charge. The way droplets of rain flow through a tube (with pockets of air between them) is known as plug flow.