How 3 new technologies can bring us closer to 100% renewable energy

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In recent decades the cost of wind and solar power generation has dropped dramatically. This is one reason that the U.S. Department of Energy projects that renewable energy will be the fastest-growing U.S. energy source through 2050 . However, it's still relatively expensive to store energy. And since renewable energy generation isn't available all the time – it happens when the wind blows or the…

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