There was an episode on planet money about this. https://www.npr.org/sections/money/2018/06/15/620298266/episode-848-the-world-s-biggest-battery https://www.npr

There was an episode on planet money about this. https://www.npr.org/sections/money/2018/06/15/620298266/episode-848-the-world-s-biggest-battery https://www.npr.org/sections/money/2018/06/15/620298266/epis...