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The same thing that's, you know, stopping them from having real power grids.

A microgrid lets you power your neighbors, or receive power from them.

This paper cites several examples of peer-to-peer electricity trading: https://www.sciencedirect.com/science/article/pii/S030626191...

Extending the grid to power a remote village is not the same thing as the villagers running their own microgrid.