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The Challenges of Renewable Energy
Scientific progress has led to solar and wind power making up an increasingly large part of the energy mix. When the sun sets, we need to figure out how to use the sun's energy to keep the lights on during the night. We don't need to have storage until we get up into the range of something like 15 to 25%. Fossil fuels, by contrast, can be burned to produce energy close to where it's needed.