New turbines have upgraded a hydroelectric dam in the Swiss Alps to a nuke-sized battery

We need batteries that can power millions of homes, deliver excellent efficiency, and cost little to operate. It turns out we’ve had the technology since 1890. We just need to build a lot more of them.

They’re called pumped water storage, and the technology is the world’s largest energy storage system, representing 98% of installed storage capacity worldwide. First deployed in the 1890s in the Swiss and Austrian Alps, pumped water storage is essentially two large reservoirs of water at...

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