Changing the world with a plastic bottle

She is 20 years old and the founder of a social venture that helps slums in Mumbai get free electricity during the day from solar energy. My little cousin Sanjna Malpani is an inspiration to me.

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She founded Jal Jyoti (translates to ‘water light’) a few years ago and works with a team of youngsters on this project that is making a big difference to many slum dwellers in Mumbai.

The way it works sounds too easy to be true: You fill a 1.5L bottle with water and 10mm of bleach to prevent algae from growing, and install it in the roof of a house in a slum. The sun’s rays hit the bottle of water; the light refracts and illuminates the house by producing light equivalent to a 55watt bulb. The bottles can last 4-5 years. They also teach the slum residents how to make and install the bottles themselves, so that they can sustain it. Slums are often so densely packed and without windows that they hardly get any light. Most of the people living there cannot afford electricity, or they save it for nighttime. This tactic is saving them money and fulfilling a basic need that we take for granted.

The challenge hasn’t been the science behind it; it has been convincing extremely poor, uneducated strangers that you can give them free light if they let you drill a hole in their roof to insert a water bottle. However, once they see the result in a friends’ or neighbours’ house, they open up to the idea. Also, working with NGO’s who operate in those slums has helped Jal Jyoti gain trust from the residents. So far they have installed a 100 bottles.

Sanjna was inspired by Alfred Moser, a Brazilian mechanic who came up with the idea in 2002 and launched ‘A Litre of Light‘. Recognizing the potential of such a simple idea in India, she jumped on it.

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