More than 2,900 people are already working at the 4.9 million square-foot facility, and another 4,000 jobs (including temporary construction work) will be added this year through the partnership between Tesla and Panasonic. 

By 2018, the Gigafactory, which is less than a third complete, will double the world's production capacity for lithium-ion batteries and employ 6,500 full-time Reno-based workers, according to a new hiring forecast from Tesla. The company's shares, having touched their highest point since August, closed up $10 at $226.99 in New York trading.