While Chanos has made wayward bets against US stocks and China recently, he built his reputation by wagering that US energy giant Enron would fail and was proven correct. He said on Wednesday that the spate of executive departures Tesla has endured this year is reminiscent of Enron before its fall. Chanos also said his bet against Tesla has lost him money to this point and he doesn't know when its stock actually will decline. Tesla didn't immediately respond to a request for comment. Executive exits Chanos predicted Musk will leave Tesla in the coming years for another one of his companies, Space Exploration Technologies.

Morgan Stanley analyst Adam Jonas said earlier this month he could envision Tesla merging with SpaceX as the rocket company becomes a more time-consuming focus for Musk. Loading Tesla has been successful because it was the first company to make electric cars fun and attractive, Chanos said. As German automakers like Porsche and BMW introduce competing models, Tesla's advantage will disappear, he said. "What Elon did was simple: He made EVs sexy," Chanos said. "Prior to that you had to compromise and get something like a Prius. "But now he has the entire auto world that has figured that out and is coming up with aspirational cars. He's fighting a different fight."

Chanos said he also believes that Tesla is behind when it comes to self-driving vehicle technology. General Motors last month showed off the latest version of its self-driving Chevrolet Bolt electric car to investors and reporters. Alphabet's Waymo is the leader in autonomous vehicles and Volkswagen has good technology, he said. Autonomy leaders "Detroit and Germany are spending billions of dollars on this," Chanos said. "Tesla is not a leader." Musk has trolled some investors in the past for betting against Tesla, tweeting in April about "stormy weather in Shortville" as the company passed Ford Motor in market capitalisation.

Short interest has been inching higher this fall and is now about 24 per cent of Tesla's free float, IHS Markit data show. Tesla's stock price has climbed 59 per cent this year. Tesla has been working to get its Model 3 sedan into production, burning money at a clip of about $10,500 a minute. The model's roll-out has been marred by bottlenecks at its battery factory and sole auto plant. Tesla produced fewer than one fifth of the Model 3s it had targeted for the third quarter and delayed plans to reach weekly output of 5,000 sedans per week to March, from December. Chanos said Tesla will need to go back to the markets to raise money in order to bring out its Semi truck and Roadster sports car.

"Tesla's biggest asset is its stock price," Chanos said. "When it falls, it will really fall." Bloomberg