In a breakthrough, four teenage schoolgirls in Nigeria have invented a 'pee-powered' generator that converts one litre of urine into six hours of electricity.
Fourteen-year-olds Duro-Aina Adebola, Akindele Abiola, Faleke Oluwatoyin, and 15-year-old Bello Eniola presented their invention at the Maker Faire Africa entrepreneurs event, in Lagos, using a resource that is free, unlimited and easily obtainable.
According to the Maker Faire blog, urine is put into an electrolytic cell, which cracks the urea into nitrogen, water, and hydrogen.
The hydrogen goes into a water filter for purification, which then gets pushed into the gas cylinder, international news agency reported.
The gas cylinder pushes hydrogen into a cylinder of liquid borax, which is used to remove the moisture from the hydrogen gas.
This purified hydrogen gas is pushed into the generator, and one litre of urine provides six hours of electricity.
Maker Faire blog described the generator as "possibly one of the more unexpected products" at the event.
While the system does have one-way valves for safety, more robust measures may be needed before it can be sold widely.
The report noted: "Let's be honest that this is something of an explosive device".
Nigeria's economy is on the rise, however, more than half of the country's 162 million citizens have no access to electricity, and even those who do can't guarantee having power every day, the report said.