In northern Switzerland, a construction team is hard at work excavating a hole in the ground that will end up being over 88 ft (27 m) deep, and spanning the length of two soccer pitches. This pit will be home to Switzerland's first redox flow battery for storing clean energy – and it'll be the most…
This article is complete bullshit. What they probably meant is that it can switch between energy input and output within milliseconds, which is realistic. Whoever wrote this lacks a basic understanding of the technology.