Enlarge / The Hummer EV and its gargantuan 205 kWh pack is among the GM EVs that gain access to the Tesla Supercharger network today. GMC 177 Starting today, electric vehicles made by General Motors gain access to the Tesla Supercharger network for the first time. GM signed a deal with Tesla last June to allow its customers access to more than 17,000 DC fast chargers around North America, following a similar deal by archrival Ford. "Enabling access to even more publicly available fast chargers represents yet another way GM is focused on further improving the customer experience and making the transition to electric more seamless," said Wade Shaffer, VP of GM Energy. GM's EVs, which include the bestselling Chevrolet Bolt as well as more recent Ultium-based EVs from Chevy, Cadillac, and GMC, will require an adapter to connect the Tesla J3400 (originally NACS) plug to their CCS1 charge ports. Unlike Ford, which made the adapter free to customers who registered before late June, the adapters will cost $225, GM says, and will be available through the EV's smartphone app. Drivers will also need to use that app to find Supercharger locations, as well as pay for charging sessions. Meanwhile, GM's brands will start building EVs with native J3400 ports from next year.