In the last six years, the price of solar power has fallen by at least 50%. And yet, for most Americans, that fact hardly matters, because they're not able to take advantage. Either their roof is facing the wrong way, there's too much shading from trees or other buildings, or they're renters rather than owners, so the decision isn't for them to make.

In the future, though, you may not need your own panel to participate in the solar boom. Instead, you might work out a relationship with someone else who has solar, using a sharing platform like Yeloha. A new site matching people with solar and people without solar, Yeloha is like Airbnb, except the excess capacity on offer isn't a room in someone's house, but spare cells on their roof.

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