In a ceremony that featured appearances from U.S. and foreign dignitaries alongside company executives and industry professionals, Japanese solar manufacturer Toyo Co., Ltd celebrated the expansion of its Humble, Texas solar module assembly plant on Tuesday. 

The facility, which first became operational in Oct. 2025, now boasts 2 GW of annual module capacity. The company plans a $357 million expansion of the site to include a 1.5 GW heterojunction (HJT) solar cell manufacturing line it expects to be operational by Q1 2028. By that time, the plant is expected to host a workforce of 400 employees.

Toyo currently manufactures solar cells at a 4 GW facility in Hawassa, Ethiopia and a 2 GW factory in Vietnam.

Jeffrey Kessler, U.S. under secretary of commerce for industry and security joined in the ceremony to celebrate the company’s domestic investments. “Toyo’s announcement is the direct result of the Trump Administration’s bold policies to bring manufacturing and jobs back to America,” he said in a comment. “By investing hundreds of millions of dollars to expand its Texas factory, onshoring overseas production, and committing to use exclusively US polysilicon, Toyo is making an important contribution to America’s manufacturing renaissance.”

The company was also joined by solar industry veteran Paul Wormser, senior vice president of Intertek CEA. Shortly before the ribbon cutting event, Toyo announced the results of an Intertek CEA factory audit, the outcome of which the company described as “a strong result.”

Wormser went further in a comment, stating “Our team conducts a rigorous, independent review of every element of a factory’s operations — quality systems, processes, and risk controls.

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