The central question is no longer simply whether a solar panel can be recycled. It is whether the industry can create a recycling system that is technically credible, economically viable, transparent, and capable of operating at scale.
The Surprising Economics Inside a Solar Panel
A solar panel contains a significant amount of glass, along with aluminum, silicon, copper, silver, polymers, and other materials. But the physical amount of a material does not necessarily correspond with its economic importance.
The episode discusses research cited in Science Bulletin indicating that silver represents only about 0.5% of a solar cell’s mass while accounting for approximately 47% of its recycling value.
That creates an unusual economic equation for recyclers. They must handle a physically large product dominated by relatively low-value glass while efficiently recovering very small quantities of significantly more valuable materials.
Recovering those materials is only part of the challenge. They also need to be separated cleanly enough to have a useful downstream market.
Why Clean Glass Matters
The episode examines the experience of Solar Panel Recycling, or SPR, and comments attributed in the source material to CEO Brett Henderson.
Henderson draws an important distinction between shredding an entire solar module and systematically separating its individual components.
When an entire panel is shredded first and materials are separated afterward, the resulting commodity streams can become contaminated. SPR’s described approach instead focuses on separating components sequentially, including glass, encapsulant, silicon, and backsheet materials.
The distinction matters because recovering a large percentage of the material by weight does not necessarily create a commercially useful recycled product. Glass contaminated with plastics, silicon, silver, or other materials may have limited value to manufacturers.
Clean separation therefore connects the technical challenge of recycling with its economics.
Transportation May Be the Bigger Problem
Even an effective recycling process cannot escape geography.
Solar modules are large and heavy relative to the value of many of the materials they contain. Panels must first travel from the project site to a recycling facility, and the recovered commodities must then reach manufacturers or other downstream buyers.
According to the discussion, transportation represents one of the largest cost drivers facing U.S. solar recycling.
One potential solution is a more distributed network of recycling facilities located closer to where panels are being retired. Greater regional capacity could reduce transportation distances while increasing the volume available to individual facilities.
That leads to one of the episode’s most important economic principles: volume is king.
As recycling volumes increase, fixed investments in equipment and facilities can be spread across more panels. At the same time, regional networks could reduce logistics costs and potentially make more recovered materials economically viable.
Certification and the Question of Accountability
Certification is another important part of the emerging solar recycling market.
The episode explores the debate surrounding R2v3 Appendix G and whether existing electronics recycling standards adequately address the unique characteristics of photovoltaic modules.
A key issue raised in the discussion is whether recycling performed by outside parties should qualify under a certification held by another company, particularly when clean material separation is central to the claimed environmental outcome.
But a certification standard only influences the market if buyers require it.
Asset owners, EPC firms, utilities, operations and maintenance providers, and other organizations ultimately determine how much weight certifications carry through their procurement requirements and approved-vendor programs.
The episode also discusses efforts within the industry to consider solar-specific standards rather than relying exclusively on broader electronics recycling frameworks.
Recovery Rates Need Context
Recycling percentages can sound impressive, but a recovery rate alone does not explain the entire process.
The discussion examines figures associated with SPR and referenced in an IEA-PVPS Task 12 report, including recovery figures of 99% for copper and up to 98% for silicon.
However, the episode emphasizes the importance of understanding how such figures were produced, what testing supported them, the operating conditions involved, and whether the resulting materials are sufficiently clean for industrial reuse.
That distinction is important across the recycling industry.
A high recovery percentage is meaningful only when the recovered commodities can move into appropriate downstream markets.
Is Panel Reuse Always Really Reuse?
The secondary market for used solar panels introduces another layer of complexity.
There can be legitimate opportunities to extend the useful life of functioning equipment. At the same time, the episode raises concerns about panels being labeled as reusable and exported overseas without a clearly documented pathway for compliant redeployment.
Economics can make those transactions attractive. Aluminum values, low labor requirements, and the ability to move hundreds of modules in a shipping container can create an inexpensive route for removing panels from an asset owner’s property.
But removing a panel is not necessarily the same thing as giving it a productive second life.
The episode therefore argues for greater scrutiny of what happens after a panel leaves its original installation. Testing, certification, grid-connection requirements, destination, and eventual end-of-life responsibility all matter when evaluating a reuse claim.
What Asset Owners Should Be Asking
The practical lesson is that end-of-life planning should begin before panels are removed from a site.
Asset owners should understand who will actually process their modules, where recovered materials will go, what evidence supports recovery claims, what third-party testing has been performed, how transportation will be managed, and what certifications are required by their contracts or procurement policies.
They should also distinguish between the recycling fee they pay and the commodity value recovered from the panels.
For recyclers, meanwhile, the challenge is continuing to invest in separation technology and regional capacity while recycling fees, material values, and volumes evolve.
Building a True Solar Circular Economy
Solar power is usually discussed in terms of deployment, generation, manufacturing, and grid integration. End-of-life management receives far less attention.
That will change as more of the world’s installed solar capacity ages.
A credible solar circular economy requires more than placing a recycling label on an old module. It requires transparent standards, documented testing, clean commodity streams, realistic logistics, responsible reuse, and downstream markets capable of consuming recovered materials.
The decisions being made today will influence whether recovered glass becomes a useful industrial input, whether valuable metals are captured, whether transportation networks become efficient, and whether reuse actually extends equipment life.
The ultimate measure of solar recycling will therefore not simply be whether a panel can be processed.
It will be whether the entire chain—from collection and separation through transportation, verification, reuse, and final markets—can operate responsibly at scale.
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Full Podcast Transcript:
Episode Transcript
Transcript lightly formatted for readability. Avatar 1 is Anna Covert. Avatar 2 is Alex Herrera.
Anna Covert: Solar panels are built to produce electricity for years, but their working life eventually raises a difficult question: what happens when a module reaches the end of its useful service? The answer is not simply to place it in a recycling facility and recover everything inside. Solar panel recycling involves economics, transportation, certification, material separation, and a growing debate over whether some panels described as reusable are actually being moved into overseas waste streams.
Today, we will examine those issues through the experience of Solar Panel Recycling, or SPR, and its chief executive, Brett Henderson. The central question is straightforward: can the solar industry build a recycling system that is both technically credible and economically scalable?
Alex Herrera: One reason this question is complicated is that the most valuable material in a solar cell is present in a very small quantity. A May 2026 research paper cited in Science Bulletin found that silver represents roughly 0.5 percent of a solar cell's mass, while accounting for 47 percent of its recycling value.
That imbalance helps explain how recyclers think about end-of-life panels. A panel is mostly glass, and glass has to be recovered cleanly if it is going to be used by glass manufacturers at meaningful volume. At the same time, small quantities of valuable metals can strongly influence the economics of the process. The recycler therefore has to handle a material that is physically bulky, costly to transport, and not uniformly valuable.
Anna Covert: SPR grew out of an electronics recycling company that had been operating for about two decades. The parent company was certified under R2V3 and e-Stewards standards, and Henderson said it had followed those standards for roughly 16 years.
But he described a concern specific to solar modules. In his view, a solar panel is effectively a single line item for a recycler, and its mostly glass composition can make it a negative-value material to process. His concern is that R2V3 Appendix G still allows recycling to be outsourced while a company retains the certification.
Henderson argues that, for solar, the glass should be recovered cleanly, without commingling, and by the certified company in-house. That is a stricter interpretation of what certification should demonstrate.
Alex Herrera: The certification question is especially relevant because a key deadline is approaching in January 2027. SPR's North Carolina operation was described as still being undecided about whether to pursue Appendix G. Henderson said the company had until 2027 to make that decision.
He also explained that SPR was building a standalone solar building in North Carolina and expected that facility to be completed before the deadline. Because it would be a separate solar company, he said the facility would not necessarily have to operate under Appendix G.
The practical impact of that decision depends on the expectations of customers. If asset owners require the certification in a request for proposals or as a condition for becoming an approved vendor, the standard can matter greatly. Without that requirement, a standalone solar recycler may face little direct pressure to obtain it.
Anna Covert: That distinction points to a broader issue in the market. Standards can exist on paper, but their influence depends on whether project owners, engineering firms, operations and maintenance providers, utilities, and other buyers use them when selecting recycling vendors.
Henderson said that, at the time of the interview, major U.S. engineering, procurement, and construction companies, operations and maintenance providers, and utilities were not requiring the standard. For that reason, he did not expect recycling volumes in the United States to be affected if a meaningful share of the industry missed the deadline.
His explanation was that recyclers are demanufacturing a product rather than manufacturing one, so the certification deadline would not automatically determine the amount of material entering the recycling system.
Alex Herrera: At the same time, Henderson indicated that the industry is actively discussing a different approach. He said a number of people on a committee had been working for about 18 months to develop what could become a gold-standard process through a major U.S. trade association.
According to his description, the committee's general view was that solar needed a standard written specifically for the industry, rather than relying on a general electronics standard with an added appendix.
That does not resolve the certification issue, but it does show why the debate continues. Solar modules have their own material composition, their own logistics, and their own recovery challenges. A standard designed for electronics recycling may not answer every question about clean glass, panel demanufacturing, or the treatment of used modules.
Anna Covert: Another question concerns the performance numbers associated with SPR's process. An IEA-PVPS Task 12 report cited recovery figures of 99 percent for copper and up to 98 percent for silicon.
Henderson characterized the basis for those figures as a hybrid of company information and third-party testing. He said the IEA did not require SPR to send samples directly to the organization or to an independent laboratory for confirmation.
However, during its questionnaires and interviews, the research team recommended seeing third-party laboratory results and wanted to understand SPR's processes. Henderson said SPR does have tests supporting the figures, while also clarifying that the IEA itself did not send samples to a lab or produce its own laboratory report for those numbers.
Alex Herrera: That distinction matters because recovery rates can be interpreted in different ways. A number may describe a result observed in a particular process, under particular operating conditions, using a particular material stream.
It does not automatically describe every recycling facility or every type of panel. It also does not tell us, by itself, whether recovered materials are clean enough to be consumed at industrial scale.
In the case of solar modules, the quality of each separated commodity is central. A high recovery percentage is useful only if the recovered copper, silicon, glass, and other materials can move into appropriate downstream markets. SPR's position is that clean separation is the essential technical challenge.
Anna Covert: Henderson drew a sharp contrast between two mechanical approaches. One approach is to batch-feed whole solar panels into a shredder, reduce them as a complete assembly, and then try to separate the different commodities afterward. He said this type of processing will always lead to contaminated products.
SPR's approach is described as mostly mechanical, but systematic. Instead of treating the full module as one object to be shredded, the company removes each commodity in sequence. The goal is to separate the layers that include glass, encapsulant, silicon, and backsheet, while keeping the resulting materials clean.
Henderson said SPR had invested 12 million dollars in new glass technology during the year discussed in the interview, with the specific challenge of separating encapsulated glass and the other layers.
Alex Herrera: The emphasis on glass is understandable. If recovered glass contains plastics, silicon, silver, or other metals, it may not be usable by glass manufacturers at volume and scale.
In that situation, the recycler may recover a large amount of glass by weight but still fail to create a commercially useful feedstock. Clean separation therefore links the technical and economic sides of the business.
Better separation can improve the value of recovered materials, but achieving it requires equipment, labor, and capital. SPR's approach depends on continuing investment in technology, and it also depends on having enough material moving through the network to justify that investment.
Anna Covert: SPR said it is profitable from recycling alone, provided asset owners pay some level of recycling fee. But that fee has changed substantially since the company began in 2018. Henderson said it had fallen by almost 80 percent.
He attributed that reduction mainly to continued investment in two areas: technology for cleaner separation and the logistics of moving panels across the United States. The company operates in a country with a large geographic footprint, so transportation is a major cost.
This is a reminder that recycling economics cannot be evaluated only by looking at the value of silver, copper, silicon, or glass. A panel has to reach a facility, and the recovered commodities then have to reach their next users.
Alex Herrera: Henderson identified transportation as the biggest cost driver in the U.S. solar recycling market. His proposed response is a distributed network of owned and operated recycling facilities.
More facilities located closer to the material supply would reduce the distance panels need to travel. He also pointed to another opportunity: more clean glass entering the U.S. market and remaining within regional markets.
In his view, the largest factor in reducing costs further is volume. He summarized the idea in familiar recycling-industry terms: volume is king. As throughput increases, fixed investments and operating systems can be spread across more panels, while regional networks can reduce transportation burdens.
Anna Covert: The market for panel reuse creates another layer of complexity. Henderson described what he sees as significant greenwashing in global reuse activity.
His concern is that some panels are offered as reusable, then shipped overseas to destinations including Southeast Asia or the west coast of Africa. The economic motivation can be powerful. Aluminum prices are high enough that a company may take panels from asset owners at no charge, while presenting the transaction as reuse.
If the panels are later exported, the shipping costs can be absorbed, and labor costs may be limited or absent. A container can hold approximately 500 to 550 modules. Those conditions create an inexpensive path for moving panels across borders under the label of reuse.
Alex Herrera: The difficulty is that the reuse market is, in Henderson's assessment, nowhere near a scalable level. He highlighted regulations governing the connection of used panels back to the electrical grid.
In the United States specifically, he said the UL rating is no longer valid once a panel becomes used. That does not mean every used panel has no possible application, but it does mean that returning used modules to grid-connected service involves regulatory constraints.
When the economics of aluminum, shipping, and limited labor are combined with those constraints, a shipment described as reuse may not represent a durable second-life market. It may instead move panels away from the original owner without establishing a reliable pathway for their future operation or recovery.
Anna Covert: SPR reportedly receives 10 to 15 inquiries each week from companies seeking to buy reused solar panels, which Henderson described as a sign of strong interest rather than proof of a mature market.
The key question is what happens after the panels leave the original system. If a used module cannot retain its relevant certification for grid connection, and if regulations limit where it can be installed, then a claim of reuse needs careful examination.
The distinction between genuine second-life deployment and overseas movement of unwanted equipment is important for asset owners, recyclers, regulators, and communities receiving the panels.
Alex Herrera: Taken together, the issues point to several tests for the solar recycling industry.
First is certification: standards need to make clear who actually performs the recovery and how cleanly the materials are separated. Second is evidence: recovery-rate claims are more useful when their testing methods, samples, and conditions are transparent.
Third is economics: recycling fees, technology investment, transportation, and commodity values all determine whether a facility can operate profitably. Fourth is scale: a process may work technically, but a national system requires enough volume and enough regional capacity to control logistics costs.
Finally, reuse claims need to be evaluated against the regulations and certifications that govern used panels, especially when modules cross international borders.
Anna Covert: The situation described by SPR does not produce a single simple verdict about solar panel recycling. It shows an industry trying to build infrastructure while material values, standards, and end markets are still developing.
Silver can represent nearly half of a cell's recycling value despite being only a small fraction of its mass. Glass can make up most of the physical material while remaining difficult to transport and valuable only when it is clean.
A certification deadline can encourage consistency, yet a general standard may not fully reflect solar-specific needs. And a growing interest in reuse can either support longer equipment lives or conceal a less accountable export pathway.
Alex Herrera: The practical lesson is that end-of-life planning has to begin before panels are removed from a site.
Asset owners need to understand the recycler's process, the destination of each recovered material, the evidence behind recovery claims, the role of third-party testing, and the transportation plan.
They also need to distinguish a recycling fee from the value of recovered commodities and to ask what certification is required by their contracts or procurement processes.
For recyclers, the challenge is to keep investing in separation technology and regional capacity while the fee structure changes. For the industry as a whole, the challenge is to develop standards that reward transparent, clean, and genuinely scalable recovery.
Anna Covert: Solar power is often discussed in terms of deployment, generation, and manufacturing. The end-of-life stage is less visible, but it will become more important as the installed base ages and more modules are removed.
The choices made now will influence whether recovered glass becomes a useful industrial input, whether valuable metals are captured, whether panels are transported efficiently, and whether reuse represents a real service or simply delays responsible disposal.
The experience described by SPR suggests that the central issue is not just whether a panel can be processed. It is whether the entire chain, from collection to separation to final market, can be verified and operated at scale.
Alex Herrera: That brings us to the main conclusion. A credible solar circular economy requires more than a label saying recycled or reused.
It requires clear standards, documented testing, clean material streams, realistic logistics, and a market capable of absorbing what facilities recover.
The January 2027 certification deadline may become one point in that development, but it will not by itself determine the future of recycling volumes in the United States.
The larger questions are whether the industry adopts solar-specific standards, whether asset owners demand them, whether recycling networks become more regional, and whether reuse claims reflect actual compliant deployment.
As solar expands, the quality of its end-of-life system will become part of the technology's overall value.
