For the past few years, charging networks, delivery fleets and retail hubs have been hustling to add infrastructure to provide juice to electric cars. The next step: helping drivers sell excess electrons back to the grid.

ChargePoint Holdings Inc., a Silicon Valley-based company that operates roughly 35,000 fast-charging ports in the United States, announced on Thursday a new kind of station that will pump power to and from vehicles, as opposed to the vast majority of chargers, which simply take electrons from the grid.

ChargePoint hopes the system will win business from companies that operate large fleets of vehicles by providing the opportunity to sell the electrons sitting in idle cars and trucks.

“We’ll start to be able to go to electric fleets and reduce the cost straight up — no i

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