Tesla Inc surpassed $1 trillion in market value on Monday after landing its biggest-ever order from rental car company Hertz, a deal that reinforced the electric car leader's ambitions to top the entire auto industry in sales over the next decade. Tesla shares surged as much as 14.9 per cent to $1,045.02, making it the world's most valuable automaker according to Reuters calculations based on its latest filing. Even Tesla Chief Executive Elon Musk expressed surprise at the velocity of the surge.