End-of-Life Management for Solar Photovoltaics

Why Is PV End-of-Life Management Important?

According to the International Renewable Energy Agency, cumulative end-of-life PV waste in the United States in 2030 is projected to be between 0.17 and 1 million tons. To put that in perspective, there are 200 million tons of solid waste, excluding recycled and composted materials, generated in the United States each year. While weather damage and installation errors cause most end-of-life issues now, some consumers and plant operators may choose to upgrade their panels before the warranty period expires or to take advantage of technological improvements.

Recycling processes for cadmium telluride and silicon PV modules exist, but in the U.S., the total cost of recycling is greater than the cost of disposing in a landfill. Focusing on PV end-of-life management will help the U.S. Department of Energy Solar Energy Technologies Office (SETO) reduce the environmental impacts of solar energy and ultimately make solar energy more affordable. Learn more about SETO’s goals.

SETO Research in PV End-of-Life Management

SETO funds research to develop new materials and designs that can make PV products longer-lasting, less energy-intensive to produce, easier to recycle, and even less polluting at the end of life. New practices can improve understanding of environmental impacts to prevent unintended pollution or human health effects. SETO's Photovoltaics End-of-Life Action Plan outlines a five-year strategy to establish safe, responsible, and economic end-of-life practices.

SETO funds several projects in the Fiscal Year 2022 Photovoltaics Research and Development (PVRD) Funding Program that work to reduce the use of precious metals like silver in solar modules, develop designs and materials separation techniques for PV recycling, which will result in a more resilient supply chain, and lower the environmental impacts of PV modules entering the waste stream.

SETO has funded projects at the National Renewable Energy Laboratory (NREL) on life-cycle analysis of PV modules and cost models for module recycling. SETO also funds NREL to coordinate PV sustainability efforts for the International Energy Agency Photovoltaic Power Systems (IEA-PVPS) program. These efforts focus on recycling research and analysis, assessing the life cycle of PV modules, improving environmental safety and health in PV manufacturing, and publishing reports on end-of-life management for PV panels. SETO has also supported NREL to survey state and local policies related to end-of-life modules.

NREL published the first assessment of worldwide efforts to recycle PV modules and identified the best ways to manage disposal. The researchers investigated lessons learned from IEA-PVPS to help inform manufacturers and other stakeholders about recycling requirements for PV hardware and efforts to design reusable modules and other equipment. The report finds that more research and development is needed in silicon purification processes, methods to avoid waste in manufacturing, lowering recycling costs, and other areas.

Additional awards:

• Several projects in the SETO Small Innovative Projects in Solar 2022 funding program are working to improve reuse and recycling processes of PV technologies.
• In 2016, SETO awarded $700,000 to EnergyBin, a company that created an online marketplace for solar-industry overstock and hard-to-find components. This marketplace allows decommissioned materials to be reused, in the form of discounted, warrantied solar project components from vetted, reputable sources. This gives new life to old materials while reducing project construction and maintenance costs.
• In 2017, SETO awarded $900,000 to SRI International, an independent nonprofit research organization, to develop a more efficient process to recycle the silicon waste generated by the wafer-cutting process into PV-grade silicon.
• In 2018, SETO awarded $150,000 to NREL to analyze PV end-of-life management and the effectiveness of efforts to design modules and other equipment for easier reuse. 
• Together with the Energy Department’s Advanced Manufacturing Office, SETO is funding a project at NREL focused on developing a certification for sustainable modules and designing recyclable modules.

Search the Solar Energy Research Database to learn more about individual SETO-funded projects.

Additional Resources

Learn more about PV research, other solar energy research in SETO, and current and former funding programs.