Hertz said Monday that it would convert more than 20% of its rental fleet to Tesla¡¯s electric cars by the end of next year, an announcement that helped propel Tesla¡¯s stock value beyond $1 trillion for the first time.

The order for 100,000 Teslas was a bold move for Hertz, which is just emerging from bankruptcy, and a sign of growing momentum in the shift to electric vehicles.

And it was the latest fuel for Tesla¡¯s skyrocketing share price, which gained nearly 13% to finish the day at $1,024.86, its first close above $1,000.