U.S. and India Partner to Build Super-Efficient Solar Panels

Solar panels are about to get a major upgrade, thanks to a groundbreaking partnership between California-based Caelux and India's Grew Solar.

The two companies signed a five-year deal to produce "hybrid-tandem" solar modules that stack perovskite material on top of silicon. This double-layer design captures more sunlight than traditional panels, targeting efficiency rates of at least 29%.

That might sound like technical jargon, but here's what it means for the planet. Today's standard solar panels convert roughly 20 to 22% of sunlight into electricity. These new modules could produce significantly more power from the same rooftop or solar farm.

Grew Solar will manufacture the panels at its massive facility in Gujarat, India, combining Caelux's perovskite-coated glass with its own advanced silicon technology. The companies are planning for 4 gigawatts of production capacity when commercial operations begin in 2028.

That's enough to power millions of homes with cleaner, more efficient energy.

India and the United States represent two of the world's biggest solar markets, making this partnership particularly meaningful. Grew Solar, owned by denim manufacturer Chiripal Group, is rapidly expanding across India with manufacturing plants in Rajasthan and plans for more facilities.

The company currently operates a 6.5 gigawatt module plant and aims to reach 11 gigawatts of module capacity by year's end. It's also participating in India's production-linked incentive program, which supports domestic clean energy manufacturing.

For Caelux, this marks another major step in bringing perovskite technology to mass production. The company has already secured similar partnerships with other Indian manufacturers Rayzon Solar and Navitas Solar, plus a deal with Puerto Rico-based Solx.

The Ripple Effect

Altogether, Caelux has now contracted 19 gigawatts of production capacity worldwide. That's not just a win for one company or one technology. It signals that the solar industry is ready to move beyond incremental improvements toward a genuine leap forward.

The partnership also shows how international collaboration can accelerate clean energy adoption. By combining American innovation with India's manufacturing scale, these companies are making next-generation solar panels accessible faster than either could alone.

Grew Solar CEO Vinay Thadani highlighted another benefit. Existing manufacturers can upgrade their current facilities rather than building entirely new plants, extending the life of their equipment while offering cutting-edge products.

This matters because the faster we can produce better solar panels, the faster countries can transition away from fossil fuels. Every percentage point of efficiency gained means more clean energy from less space, making solar power viable in more places.

The future of solar energy just got a whole lot brighter, and it's being built through cooperation rather than competition.