Tesla set to unveil electric semi-truck in September

Tesla Inc. CEO Elon Musk says the company plans to unveil an electric semi-truck in September.

Musk tweeted the announcement on Thursday. He offered no other details about the semi-truck, such as whether it will be equipped with Tesla's partially self-driving “Autopilot mode”. Musk also said the company plans to unveil a pickup truck in 18 to 24 months.

Tesla currently sells two electric vehicles, the Model S sedan and Model X SUV. Its lower-cost Model 3 electric car is due out by the end of this year. But Musk revealed last summer that the Palo Alto, California-based company is working on several more vehicles, including the semi and a minibus.

Tesla shares rose $7.16, or 2.4 percent, to close at $304 in response to Musk's tweet.