“UCR taught me how to think — how to connect the dots.”
For Charlie Gay, Ph.D., that habit of mind began in the research laboratories of the University of California, Riverside. There, precision, patience, and trust in data became habits he would carry into the emerging solar industry — and eventually into a career that helped move solar power from laboratory promise to global infrastructure.
More than five decades later, Gay has been named one of three recipients of the 2026 Mani L. Bhaumik Breakthrough of the Year Award from the American Association for the Advancement of Science (AAAS), publisher of the Science family of journals. The award recognizes Gay’s role in the global rise of renewable energy, the shift that Science named its Breakthrough of the Year and that has helped transform solar power from an experimental technology into a major source of electricity.
The recognition follows a historic milestone: in 2025, renewable energy overtook coal as the world’s largest source of electricity, marking a major shift in the global power system. Gay shares the award with Hans-Josef Fell, a German renewable energy policy leader, and Li Junfeng, a Chinese leader in renewable energy development.
For UC Riverside, the honor is also an alumni story.
Gay earned his bachelor’s degree in chemistry from UCR in 1968 and his doctorate in physical chemistry in 1978. At the time, his research did not point directly toward solar energy. He studied the thermodynamic properties of fluids near the critical point, building instruments capable of measuring physical properties with exceptional precision.
“The work I did there looked, on paper, like a long way from solar cells,” Gay said. “But the habits of mind — patience with hard measurements, respect for the data, the discipline of building the apparatus before trusting the result — turned out to be exactly what the early photovoltaics field needed. Everything I’ve done since traces back there.”
That foundation helped guide Gay into one of the defining technical challenges of the past half-century: making solar power practical at scale.
After beginning his career at Spectrolab in 1974, where he worked on solar power systems for satellites, Gay joined ARCO Solar during the formative years of the photovoltaic industry. There, he helped establish the company’s research and development program and led efforts that brought solar technology from laboratory prototypes to commercial manufacturing.
Under his leadership, in 1980, ARCO Solar completed one of the world’s first factories capable of producing more than one megawatt of photovoltaic modules per year. The company also built the first solar power plant interconnected to a U.S. utility grid, at Southern California Edison’s Lugo substation in Hesperia.
Together, those projects marked an early turning point. Solar was no longer only a research ambition or a space technology. It could be manufactured, deployed, and connected to the electric grid. In 1990, UCR recognized these accomplishments by presenting Gay with the Distinguished Alumnus Award, and in 2006, he was the UCR Graduate School Commencement speaker.
“Charlie Gay’s work reflects what we hope for our graduates, that they use their education to solve problems that matter,” said Christopher Lynch, dean of the Marlan and Rosemary Bourns College of Engineering. “This is a well-deserved recognition for a career of lasting impact, and we are proud that his path began at UC Riverside.”
Gay’s career continued across many of the institutions that shaped the modern solar industry. He held leadership roles at Siemens Solar Industries, ASE Americas, SunPower, and Applied Materials, where he founded the company’s Solar Business Group and grew it into a multibillion-dollar business.
He also helped guide national research priorities. Gay served as director of the National Renewable Energy Laboratory from 1994 to 1997 and later led the U.S. Department of Energy’s Solar Energy Technologies Office from 2016 to 2019, overseeing research projects across national laboratories, universities, and industry partners. Across those roles, he helped connect research, manufacturing, policy, and deployment — the same discipline of connecting the dots that he traces to UCR.
In 2013, Gay was elected to the National Academy of Engineering, one of the profession’s highest honors. He holds more than 15 U.S. patents related to solar technology and manufacturing processes and has authored more than 50 technical publications.
The 2026 award recognizes a transformation measured not only in invention but also in adoption. Over the past five decades, the cost of solar electricity has fallen by more than 99%. What was once a specialized technology is now among the cheapest sources of new electricity in many markets.
Gay has often described that progress as a collective achievement, shaped by scientific discovery, industrial discipline, policy, investment, and public demand. His own career sits at the intersection of those forces.
Beyond industry and government, Gay co-founded the Greenstar Foundation, which deployed solar-powered community centers in more than a dozen countries. The centers combined renewable energy with communications, education, and community development.
Today, Gay remains active in the field. He advises companies, mentors entrepreneurs, and helps lead energy research collaborations that include UC Riverside and regional partners. More than 50 years after entering the solar industry, he is still focused on what comes next: making solar energy more intelligent, distributed, and integrated into daily life.
The AAAS honor recognizes a career that helped move renewable energy from possibility to infrastructure. For UC Riverside, it also marks the reach of an alumnus whose scientific foundation began in Riverside — and whose work now extends into the future of global energy.
Read the official press release: https://www.aaas.org/news/bright-sun-splashed-future-renewable-energy