How Subways Are Powering Cities. Every time a subway screeches to a stop, commuters pour out, new riders pile in. Just another day on the rails. But what if that screech could do more than just move people? In Barcelona, it does. They`ve taken the regenerative braking you might know from your EV and cranked it up to city scale. Now, their metro isn`t just moving passengers, it`s powering escalators, traffic lights … and even EVs. It`s a sneak peek into a future where energy isn`t only harvested from solar panels or massive power plants, but reclaimed from the overlooked rhythm of urban life. So, how much energy are we letting slip through the cracks, and what happens when we start catching it?
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