downspout

Researchers from the City University of Hong Kong are developing a new technique to harness the power of falling rainwater and convert it into electricity for passive applications and battery recharging.
One water drop alone under this novel way of converting and redistributing its kinetic energy can generate enough of a spark to light up a matrix of one LED bulbs. While the rain may not be appropriate for energy-intensive scenarios, the project leader believes that the field effect transistor method could be overlaid with other energy harvesters to multiply their efficacy—on rooftop solar panels, for instance, to ensure a steadier power-supply even when the conditions aren’t so sunny, or even one’s own umbrella whose cane would become a power-wand. Learn more at the link above.