A 15-year-old girl’s ingenious source of renewable energy could bring light and electricity to the poorest, rainiest parts of the world.

Reyhan Jamalova is the founder of Rainergy, a contraption which can generate electricity from rainwater.

According to the ninth grader from Baku, Azerbaijan, rainwater is one of the few renewable energy sources that has not yet been exploited to its full potential. While solar and wind energy is currently dominating the market, both of the industries require extensive manufacturing, investment, upkeep, and maintenance. Rainergy, on the other hand, is a simple design made up of four key parts.

At the top of the instrument is a bucket that collects the rainwater and funnels it into a reservoir. The reservoir is connected to a generator through which the water flows and creates energy. The electricity is then…