American solar manufacturing just got a major upgrade in California. On April 21, 2026, Tandem PV cut the ribbon on its brand-new 65,000-square-foot solar factory in Fremont — the first U.S. commercial demonstration plant for next-generation perovskite-silicon tandem solar panels. Former U.S. Energy Secretary Jennifer Granholm, California Energy Commission chair David Hochschild, and Fremont Mayor Raj Salwan were all there for the cutting.
This isn’t another solar factory churning out the same panels everyone else makes. Tandem PV is doing something genuinely new — manufacturing tandem solar panels with 29.7% efficiency based on internal testing, well above the standard silicon-only panels that have dominated the market for decades. American innovation, American manufacturing, American jobs.
Why Perovskite-Silicon Matters
For 20 years, China has dominated global solar manufacturing — not by inventing better technology, but by undercutting prices on commodity silicon panels. The U.S. fell from being the world’s solar leader to a distant third or fourth. Tandem PV’s bet is that the path back isn’t a price war — it’s a technology leap.
Their perovskite-silicon tandem panels stack two different solar materials on top of each other to capture more of the sun’s energy than either material can on its own. The result: higher efficiency from the same physical footprint — meaning more electricity per acre of solar farm, lower installation costs per watt, and panels that perform better in real-world conditions.
Inside the Fremont Factory
The Fremont facility runs 65,000 square feet of state-of-the-art production equipment with approximately 40 megawatts of annual nameplate capacity. That’s the demonstration line. The company has begun producing initial panels and plans to ship them to customers for validation trials later in 2026, with first commercial sales the same year.
The bigger goal: high-volume manufacturing by 2028, the kind of scale that can actually move the needle on America’s solar supply chain dependence. Fremont is the proof-of-concept. The next factory after this one is the one that goes head-to-head with foreign producers.
$87 Million in Funding, American All The Way
Tandem PV has raised $87 million in funding from investors who believe in U.S. clean energy manufacturing. Their stated mission is to “restore American leadership in clean energy” — not just produce panels in America, but rebuild the technological lead the U.S. once had in solar before allowing it to slip overseas.
The company has partnerships across leading U.S. research institutions and supply chain players, and is hiring across engineering, manufacturing, and operations roles in California right now. This is exactly the kind of high-skill American manufacturing job creation that turns a startup into a long-term industry.
Who Showed Up — and Why It Matters
The April 21 ribbon-cutting drew serious attention. Former Energy Secretary Jennifer Granholm spoke. David Hochschild, chair of the California Energy Commission, was there. So was Raj Salwan, mayor of Fremont. When that level of policy and political leadership shows up for a solar factory opening, it’s because they understand what’s at stake: domestic manufacturing of strategically important energy technology, on American soil, at American scale.
The Bigger Solar Picture
For Buy American to mean anything in solar, U.S. companies need to make panels that are not just American-made, but actually competitive on performance. For two decades, the answer was “we can’t” — foreign producers would always undercut us. Tandem PV is part of a wave of U.S. solar startups proving that wrong by leapfrogging to the next-generation technology.
If American startups can produce 29.7%-efficient panels at competitive cost on U.S. soil, the calculus changes for every American solar developer, utility, and homeowner. Suddenly “Buy American” in solar isn’t a sacrifice — it’s an upgrade.
What You Can Do
If you’re considering solar — rooftop or commercial — ask your installer specifically about American-made panels. Ask about Tandem PV when their commercial product hits the market later this year. The more demand U.S. customers create for U.S.-made panels, the faster companies like Tandem PV can scale up the second factory, the third factory, and the kind of national manufacturing capacity that moves the energy independence needle.
A 65,000-square-foot factory in Fremont may not sound like the start of a national solar comeback. But the same way a small mill in one town can mark the rebirth of an industry, this one in California is worth watching. American innovation built solar in the first place. American manufacturing can take it back.
Whenever possible, choose Made in USA.
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