The Elon Musk-led electric vehicle maker is willing to invest up to $500 million if the government approves the reduced duty for 12,000 vehicles and up to $2 billion if the concession is for 30,000 vehicles.

Tesla (TSLA.O) has had a red-carpet welcome from India for its proposal to invest in the country, while its largest rival in electric vehicles, China's BYD (002594.SZ), has been stopped cold by increased scrutiny from New Delhi.