Intel and Elon Musk are reportedly building a semiconductor manufacturing facility larger than the Pentagon, Apple Park and the Mall of America combined.

Tesla, SpaceX and xAI confirmed in August that Terafab, a $16.8 billion first-phase chip factory in Grimes County, Texas, will run on Intel's unproven 14A process. Texas government filings submitted in early September list a construction start date of December 1, 2026.

Pull up a satellite map of Grimes County, about an hour northwest of Houston, and there is nothing there yet but a drained reservoir and ranchland. By the end of 2028, if the timeline holds, there will be a single building with more floor space than the Pentagon, Apple Park and the Mall of America combined. The complex will create an estimated 3,000 jobs.

The critical number here isn't acreage—it's the process node. Terafab is being built to run Intel's 14A, the 1.4-nanometer node Intel has not yet proven can be manufactured at volume, let alone profitably. Musk is betting a hundred-million-square-foot building on a chip process that doesn't fully exist as a commercial product yet.

Reuters reported in early May, citing Musk's own comments, that Tesla plans to use Intel's next-generation 14A process for the chips produced at Terafab, marking Intel's first major outside customer for that node. This single fact represents the entire strategic value for Intel. CEO Lip-Bu Tan had said publicly that Intel would walk away from leading-edge chip manufacturing entirely if it couldn't land an external customer willing to commit to 14A. Musk provided that commitment. Intel joined the project formally in April, and TrendForce reported that Tesla effectively became the first customer to claim a 14A production slot ahead of any other foundry client Intel had lined up.

This is not a story about Musk buying capacity from a supplier. It is Intel's foundry business receiving a lifeline from a customer who is simultaneously building the factory the chips will occupy. For a company as large as Intel, this is an unusual position—a reflection of how thin the market for advanced foundry customers actually was before this deal.

The vertical logic is straightforward. SpaceX completed an all-stock acquisition of xAI in February, folding the AI unit into a combined entity valued by Sherwood News and other outlets at roughly $1.25 trillion. Musk wants this entity manufacturing its own AI chips instead of waiting in line behind Nvidia's other customers or depending on Taiwan Semiconductor Manufacturing Co. the way nearly every other chip designer on Earth does. Terafab is the building designed to make that possible.

The planned footprint exceeds 100 million square feet. Tesla's Gigafactory Texas in Austin runs about 10 million square feet across a 2,500-acre campus, making Terafab roughly ten times that size. The current world record for the largest building is the New Century Global Center in Chengdu, China, which covers about 18.9 million square feet. Terafab would be close to five times larger.

The risks here are not about size—they concern money and physics. A fab of this magnitude running a process node this unproven is a bet on two fronts: that 14A matures on Intel's timeline, and that Musk's companies can actually fill a building the size of a small city with working equipment by the end of 2028. Intel has missed node timelines before. Tesla, on the factory side, has also fallen behind schedule, with Cybertruck production and the original Berlin Gigafactory both arriving well after their announced dates.

The site itself carries complications. Terafab is being built on land surrounding the old Gibbons Creek Reservoir, which cooled a coal-fired power plant that shut down in 2018. SpaceX has said it will draw water from that reservoir rather than local groundwater—a direct response to Grimes County concerns about a chip plant's water demands, according to the Houston Chronicle. Governor Greg Abbott's office confirmed that the state is providing a $30 million grant from the Texas Enterprise Fund, separate from whatever incentives Grimes and neighboring Brazos County negotiated locally.

Musk has offered a more modest framing. By the time Terafab is running at scale, he said, 14A will probably be "fairly mature or ready for prime time."