Caelux

Caelux (formally Caelux Corporation) is a Baldwin Park, California-based pioneer in perovskite solar technology, developing and manufacturing its proprietary "Active Glass" - a perovskite-on-silicon hybrid tandem solution that transforms the top glass layer of conventional solar modules into a second, active power-generating layer. By integrating directly into existing silicon solar manufacturing lines, Caelux's technology delivers up to 30% more power generation capacity and improves levelized cost of electricity (LCOE) by 20% or more compared to standard silicon panels - without requiring solar manufacturers to retool their entire production process. The company operates a 50-megawatt demonstration manufacturing line and employs AI and advanced automation to ensure continuous quality improvement at scale.

What sets Caelux apart is its integrative "add-on" business model: rather than building complete solar modules itself, Caelux supplies its Active Glass as a drop-in upgrade to leading solar module manufacturers globally. Its flagship products - CaeluxTM One (targeting distributed and utility-scale markets with up to 6% absolute efficiency improvement) and CaeluxTM v0 (for rooftop module makers, with ~3% absolute gain) - are designed to slot into existing supply chains with minimal disruption. In July 2025, the company completed its first commercial shipment of Active Glass, a landmark milestone. It has also partnered with UNSW researchers and announced a landmark 5-year, 3-gigawatt partnership with U.S.-based solar manufacturer Solx in April 2026.

Caelux is strategically significant to the US energy supply chain as one of the few domestic perovskite manufacturers operating at commercial scale. Its fully US-based manufacturing in California and partnerships with domestic module makers (including Solx in Puerto Rico) directly support a homegrown, tariff-resilient solar supply chain. As AI-driven energy demand and electrification accelerate the need for abundant, low-cost solar power, Caelux's approach to dramatically boosting silicon module output without building greenfield fabs positions it as a critical bridge technology between today's silicon dominance and the next generation of ultra-high-efficiency solar. The company has been recognized by TIME as one of America's Top GreenTech Companies 2025 and won the 2025 CleanTech Breakthrough Award for Solar Technology Company of the Year.