Scarce and finicky public chargers are among the biggest reasons people hesitate to buy electric cars. So when Elon Musk, the chief executive of Tesla, agreed last year to open the company’s well-regarded Supercharger network to vehicles from other carmakers, many drivers and industry experts celebrated the decision.
But more than 12 months later, Tesla’s network, with nearly 30,000 fast-charging plugs in the United States and Canada, remains largely inaccessible to most people who don’t drive Teslas because of software delays and hardware shortages.
The delays have fueled speculation that Mr. Musk was having second thoughts about opening up Tesla’s network, possibly because he was worried that access would help other automakers sell battery-powered models and lure customers from Tesla, which has suffered from declining sales.
Tesla eased those fears a bit on Friday when the company’s charging unit posted on X that it had stepped up production of a crucial piece of hardware: adapters that drivers of Ford, Rivian and other car brands need to connect to Tesla chargers.
A Tesla factory in Buffalo is producing 8,000 of the adapters per week, the company said, noting that outside suppliers are also producing the part. Still, it is unclear how fast those adapters would reach electric vehicle owners.
Tesla did not respond to a request for comment, and the other automakers have been reluctant to speak in detail, apparently because they do not want to antagonize Tesla and Mr. Musk.
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