What innovations in technologies and business models can enable offgrid power to provide significantly higher benefits?

It might be hard to believe, but over 1 billion people worldwide lack access to electricity - either because there's no main electricity grid or because power from the grid is scarce. For many of these people, most of them located in rural and remote regions, offgrid power sources comprise the only viable source of electricity. Effective innovations and business models in offgrid power can thus make a dramatic difference to the life and health of these billion plus people. What could these innovations be?

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