Under a recent utility deal, solar power sold for under three cents per kilowatt hour, the lowest level on record in the U.S. Getty Images/iStockphoto

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Solar power has become incredibly cheap to generate, and that makes it more likely that the world will continue to move away from fossil fuels, even as America withdraws from the Paris Climate Accord.

A deal signed late last month marked a new milestone for American solar power. NextEra Energy signed a contract to sell solar energy to Tucson Electric Power for less than three cents per kilowatt hour (the way that electric companies measure the cost of electricity), according to a press release from Tucson Electric Power. That’s less than half what the company has paid for similar contracts in recent years, and it appears to be a new record for the U.S.