In Bangladesh, the Government pays for millions of villagers to have a little box in their homes that transmits electricity. Each house has solar panels on the roof and a battery to store power: two things that are common enough now in many parts of the world.

But the little transmission boxes are different. They connect each household in the village, allowing them to buy and sell power to each other. Those villages have bypassed the development stage of being connected to the national grid, forced to pay high prices, subject to unreliable distribution. They have their own microgrids.

What's

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