Solx and Caelux said they will supply 3 GW of Solx Aurora modules, which combine domestic Suniva silicon cells with a top layer of Caelux “Active Glass” to achieve 28% efficiency, with commercial volumes available in the US market in 2027.
Solx, a solar panel manufacturer based in Aguadilla, Puerto Rico, and Caelux, a manufacturer of perovskite-coated glass, have announced a five-year strategic partnership for the production of perovskite-silicon tandem modules.
Through the partnership, the Solx facility in Puerto Rico will supply 3 GW of the company’s Aurora modules that use Caelux “Active Glass” instead of conventional top glass, adding an additional layer of energy generation on top of a solar panel made using silicon cells.
The resulting hybrid tandem module is said to exhibit an energy conversion efficiency of 28% – much better than average crystalline silicon solar modules, but falls short of expectations. Efficiency record of 31.1% for a perovskite/silicon tandem module set by LONGi in 2025.
In an interview from April 2025 of pv magazine USACaelux chief technology officer Ernest “Charlie” Hasselbrink discussed how the company’s four-terminal approach sacrificed a little extra efficiency in exchange for scalability and sustainability.
The companies say they expect to deliver the Aurora modules in commercial volumes to the US market by 2027 and have already deployed a beta version of the product in a project with a US-based developer.
“This is a defining moment for American energy production,” Solx CEO James Holmes said in a statement. “We have integrated Caelux’s leading glass technology into our domestic manufacturing platform, designed for gigawatt-scale production. This is how the US is leading the way again – by building the energy future at scale.”
The news about the collaboration between Solx and Caelux follows on the heels of another perovskite announcement from Tandem PVwhich recently opened a 40 MW commercial demonstration plant in Fremont, California.
Solx brings module production to Puerto Rico
Featuring solar cells made by Suniva, which sources raw materials from Corning’s plant in Hemlock, Michigan and recently announced its intention to build a new 4.5 GW facility in South Carolina, the Solx Aurora modules represent a significant step toward a fully domestic solar supply chain.
“This partnership shows what is possible when American manufacturers and technology leaders align,” said Matt Card, CEO of Suniva. “We are strengthening domestic energy security, creating high-quality American jobs and enabling the next generation of solar energy innovation.”
Solx first announced that it wants to produce solar panels in Puerto Rico in 2024 started construction at a former Hewlett Packard factory in Aguadilla, Puerto Rico in April 2025.
At the time, the company estimated it would create 200 jobs and produce 1 GW per year of 625-watt modules made with steel frames from Origami Solar. It is not known whether the agreement to source the steel frames was transferred following the acquisition of Origami Solar by Nextpower (then Nextracker) in September 2025.
That same month, in a conversation of pv magazine USAHolmes said he expected the Solx plant to be operational by the end of the year and estimated that most of the plant’s production would be supplied to solar companies in the continental US. Holmes said at the time that the company aimed to reach a production capacity of 10 GW by 2030.
In April 2026, just over a year after construction of the Solx factory began, Omar Ramirez Gonzalez, the company’s senior director of manufacturing operations, announced the first completed module to roll off the line in a message on LinkedIn.
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