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Can a city run on car batteries? The 'vehicle-to-grid' idea might just work

Fewer than one per cent of the world's vehicles are electric, but by 2040 more than half of all new cars will run on the same juice as televisions, computers and hair dryers

Car, car engine, car battery
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Stephen Stapczynski | Bloomberg
When Damien Maguire moved to the countryside outside Dublin, he struggled to keep the lights on at home because of the town’s constant power outages. He found a solution inside his electric cars: their batteries.

A tinkerer who posts videos of his hand-built vehicles on Youtube, Maguire devised a wiring system that lets him suck power out of them when they’re parked in the garage. Now that the house and cars are connected, he can also use the batteries to store energy from his backyard solar panels, another power source that’s not totally reliable given Ireland’s weather.

“You have the

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