Aug 26, 2026 · 16 min · 10 segments
Solar panels can generate clean electricity for decades. But eventually every module reaches the end of its useful life. Then what? In this episode of The Solar Coaster, Anna Covert and Alex Herrera…
Alex HerreraHost
Anna CovertHost
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 two thousand twenty-six research paper cited in Science Bulletin found that silver represents roughly zero point five percent of a solar cell's mass while accounting for forty-seven percent of its recycling value.

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.

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 sixteen years.

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.

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 two thousand twenty-six research paper cited in Science Bulletin found that silver represents roughly zero point five percent of a solar cell's mass while accounting for forty-seven percent of its recycling value.

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.

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 sixteen years.

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.
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