SEG Solar secured land for a planned $950 million, 4 GW heterojunction (HJT) solar cell plant at its Tomball Industrial Campus in the greater Houston area.
The multi-phase development is expected to create more than 700 local jobs and is scheduled to come online in two 2 GW phases, targeted for 2028 and 2029.
The cell plant will sit directly adjacent to SEG’s operational 4 GW Tomball #1 module facility and its 4.6 GW Tomball #2 module facility, which is currently under construction. Co-locating the cell lines will bring cell, module, and balance of module production together in one location alongside warehousing, a research and development center, a certified testing laboratory, and planned EVA film and junction box manufacturing lines.
The announcement represents the next step in the company’s domestic vertical integration strategy. Earlier this year, SEG opened its Tomball #1 assembly facility, scaling up crystalline-silicon production in Texas as part of a push to build out domestic supply capacity.
Following the site opening, the manufacturer launched production of its first commercial-scale HJT modules at the secondary facility, establishing the high-efficiency technology as a central component of its U.S. manufacturing footprint.
Supplying Texas-assembled modules with domestic HJT cells will allow project developers and asset owners to meet federal domestic content requirements under the Inflation Reduction Act while securing dedicated supply chains.
“Bringing HJT cell manufacturing to the U.S. will give customers a more domestic supply chain with clearer sourcing and a single company standing behind the product,” said Jim Wood, chief executive officer of SEG Solar, who recently spoke on U.S. manufacturing expansion at pv magazine USA Week 2026. “As the only U.S. company dedicated to integrated domestic vertical manufacturing, SEG will continue to strengthen our U.S. operations and innovation.”
Founded in 2021, the Houston-headquartered manufacturer reported shipping over 7.5 GW of solar modules globally through the end of 2025, reaching an annual module production capacity of 6.5 GW.
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