The thermal battery transforming cold storage for India’s dairy farmers

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In 2007 Sam White, co-founder of Promethean Power Systems, was traveling through India looking for a rural electrification problem to solve. He and his team had just won a $10,000 grant in an MIT competition, and they wanted to find an industry in India that needed their help. After looking at the sugar industry and the grape industry, they finally settled on dairy. India is the largest producer and consumer of milk in the world, but poor infrastructure makes getting chilled milk from farmer to consumer difficult. Industry standards require milk to be chilled within four hours of milking the cows, or bacteria spoils it. India averages six hours. Sam’s team had found their problem. But it…