Developing cheap energy storage is a critical step in moving to renewables and away from fossil fuels as the primary source of electricity: it’s the only way such intermittent sources can supply power to the grid when the wind’s not blowing and the sun’s not shining. Duke Energy, the nation’s largest utility, is trying a novel strategy to tackle this challenge. At its Rankin substation, in North Carolina, it has installed a system of hybrid…
New grid storage technology helps integrate renewables
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