Two of Elon Musk’s companies are teaming up to build data centers in space, according to a post on the SpaceX website. The rocket and satellite company acquired xAI, Musk’s artificial intelligence company, which also owns the social media platform X (formerly Twitter).

In the post, Musk said the combined company would be “the most ambitious, vertically integrated innovation engine on (and off) Earth, with AI, rockets, space-based internet, direct-to-mobile device communications and the world’s first real-time information and free speech platform.”

SpaceX is planning a public offering, and the acquisition, the largest in history, could put the value of Musk’s company at $1.5 trillion, according to Bloomberg, which first reported the deal. The New York Times estimates are closer to $1 trillion.

In the post, Musk cited concerns about Earth-based data centers, including theirs huge demand for electricity and the “difficulty of communities and the environment” they represent. He said the acquisition is part of a plan to use solar power to run data centers and space-based facilities that will train AI models and lead to scientific breakthroughs.

“My estimate is that within 2 to 3 years, the lowest-cost way to create AI compute will be in space,” Musk said.

A SpaceX representative did not immediately respond to a request for comment.

SpaceX recently promises Gigabit internet speeds from space with its V3 Starlink satellites.