Relying on hydropower alone to store green energy is not enough. Policy must also help storage technologies thrive
wind power are the glamorous twins of the clean-electricity revolution. It is thrilling to see a field of glistening panels absorbing the sun’s energy or a vast turbine twirling above the ocean. Stationary power storage does not have quite the same allure—think of a large metal shed stuffed with piles of big batteries. Nonetheless, the ability to stockpile energy on a massive scale will be of supreme importance if the world is to wean itself off filthy fossil-fuel power plants.
Today pumped hydropower is the most common way to store energy. When it is sunny or windy any excess electricity from solar and wind farms can be used to pump water uphill into reservoirs, to be released later to generate hydropower. But lots of places lack mountains, rain and room. Batteries are an alternative. They can smooth jumps and drops in supply and store renewable energy when it is abundant, as in California on a sunny afternoon, and then release it in the evening, when demand rises.
France Dernières Nouvelles, France Actualités
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