A $950 Million Solar Factory Plan Could Turn a Texas Campus Into a Domestic Supply Hub

A solar manufacturer outside Houston wants to make more of the components that go into American solar panels in one place, rather than depend on a supply chain stretching across several countries.

SEG Solar has secured land for a planned $950 million solar-cell manufacturing facility at its Tomball Industrial Campus northwest of Houston. The proposed plant would have 4 gigawatts of annual production capacity and, if completed as planned, create more than 700 local jobs.

It is an ambitious proposal, not yet a finished factory or a guaranteed investment. The company announced the land agreement Oct. 29 and set targets for two construction and production phases, each accounting for 2 gigawatts of capacity. The first phase is targeted for 2028 and the second for 2029.

Why the location matters

Tomball is already home to SEG’s 4-gigawatt module manufacturing facility, where solar modules are assembled. Another 4.6-gigawatt module operation is under construction at the same campus. The proposed cell plant would fill a gap in that production chain by making the electricity-generating cells that manufacturers place inside finished panels.

Solar cells and solar modules are related, but they are not interchangeable. Cells convert light into electricity. Modules combine cells with protective materials, wiring and frames to produce panels that can be installed on a roof or in a utility-scale solar field.

Producing cells near module assembly could reduce shipping between factories, give the manufacturer more control over quality and make it easier to document where components originate. That last point matters for customers seeking to satisfy federal domestic-content requirements.

The company’s Tomball project announcement also describes plans for research and development, a testing laboratory, warehousing and production of selected components used in modules.

A different kind of solar manufacturing

The proposed operation would produce heterojunction solar cells, a technology that combines different layers of silicon-based materials to convert sunlight into usable electricity. For developers and buyers, the relevant questions are efficiency, durability, cost and whether the manufacturer can deliver large quantities reliably.

Texas offers a notable setting for the project. The state is a major electricity market with extensive solar development, but large-scale solar installations do not necessarily mean every component is made in the United States. Domestic manufacturing has to compete on price and quality while operating under trade and energy policies that can change.

The planned Tomball facility therefore offers a test of whether co-locating several stages of production can make U.S.-manufactured solar equipment commercially competitive. Industry publication pv magazine USA reported the land deal and the company’s expansion schedule.

What has been announced, and what has not

The announced $950 million is the company’s planned investment, not money already spent on a completed project. The more than 700 jobs are a projection rather than current payroll positions. SEG has not publicly supplied a full financing package, a detailed construction calendar, the wages for those jobs or a final accounting of local incentives in the announcement.

Those distinctions matter in a region where factory proposals can reshape expectations for jobs, infrastructure and tax revenue years before a production line starts operating.

If the Tomball expansion proceeds as proposed, the Houston area could become a more significant link in the domestic solar supply chain, with cell manufacturing alongside module production on one campus. The immediate milestone is smaller but concrete: land has been secured for a factory that the company intends to build.