Los Angeles Mayor, Antonio Villaraigosa announced on March 22, 2013 that by 2025, the City of Los Angeles would no longer get any of its electricity from coal—a dramatic change from just a few years ago, when half of L.A.’s power was coal-fueled. The city has already quadrupled its renewable energy use. California enacted a renewable portfolio standard in 2002 that ordered all utilities in the state to get a third of their electricity from wind, solar, or hydropower by 2020. Twenty-eight other states and the District of Columbia have similar requirements. But as states ramp up their use of renewables, but they’ll run into a problem the Mayor didn’t speak of: energy storage.
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