The photovoltaic industry is growing rapidly worldwide. At the same time, one topic is gaining increasing attention across the sector: the recycling of solar modules and the recovery of valuable raw materials.

A recent industry article even describes photovoltaics as potentially the “richest silver mine in the world” — not underground, but installed on rooftops and in solar parks. What may sound surprising at first highlights an important fact: end-of-life or damaged solar modules are not waste — they are a valuable resource for the energy transition.

Why Solar Modules Are an Important Source of Raw Materials

Modern photovoltaic modules contain a wide range of valuable materials – as highlighted by recyclers such as Reiling PV-Recycling GmbH & Co. KG. These include, among others:

• Glass
• Aluminum
• Silicon
• Copper
• Plastics
• Silver

Silver is particularly important, as it is used in the electrical contacts of solar cells. Modern modules typically contain around 300–400 ppm of silver, which in some cases corresponds to concentrations similar to — or even higher than — those found in certain silver ores.

At the same time, global demand for silver is increasing significantly due to the rapid expansion of solar energy. As a result, recycling is becoming increasingly important as a secondary source of raw materials for the industry.

Which Materials Can Be Recovered from Photovoltaic Modules

A large portion of a solar module consists of materials that can be technically recycled.

Typically, more than 80% of a module’s weight consists of glass and aluminum, both of which can already be recovered relatively efficiently today.

In addition, other materials can be extracted from modern PV modules:

• Glass – the largest share of the module
• Aluminum – from the module frame
• Silicon – from the solar cells
• Silver – from the cell contacts
• Copper – from conductors and junction boxes
• Plastics – from encapsulation films

In principle, up to 95% of the materials in a solar module can be recycled. This makes photovoltaics particularly well suited for a functioning circular economy.

Why Solar Module Recycling Will Grow Strongly in the Future

The expansion of photovoltaics over the past 20 years means that increasing numbers of modules will reach the end of their service life in the coming decades.

Typical reasons for removing or replacing modules include:

• Aging after 25–30 years of operation
• Damage caused by weather events
• Technical defects
• Repowering of solar parks
• Replacement with higher-efficiency modules

Repowering projects in particular often result in large quantities of still functional but less efficient modules. These modules may either enter secondary markets or be sent for recycling.

As the global expansion of photovoltaics continues, this trend will accelerate significantly. Accordingly, the market for PV recycling is expected to grow dynamically in the coming years.

The Role of Recycling in the Solar Industry’s Circular Economy

The energy transition is built on an expanding technological infrastructure. In addition to solar modules, this includes battery storage systems, inverters, and other electrical components required to generate, store, and distribute solar energy.

As these technologies expand, the demand for critical raw materials continues to grow. To reduce long-term dependencies on primary resources and stabilize supply chains, the concept of the circular economy is becoming increasingly important in the solar industry.

Materials such as silver, silicon, copper, and aluminum play a key role in this transition. These raw materials are required in large quantities for the production of photovoltaic modules and electrical infrastructure. In the future, it will become increasingly important to recover these materials not only from newly mined resources but also from existing installations.

Solar module recycling enables exactly this approach: valuable materials can be recovered from decommissioned or damaged modules and returned to the production cycle. In this way, recycling becomes an essential component of a resource-efficient industry, stable supply chains, and a sustainable energy system.

How the Trade of Solar Modules for Recycling Can Be Organized

In addition to recycling technology, another factor is crucial: the organization of material flows.

Many operators, installers, and project developers face important questions:

• What should be done with old or damaged solar modules?
• How can suitable recycling companies be found?
• How can larger quantities of modules be bundled economically?

Digital marketplaces are playing an increasingly important role in addressing these challenges.

Trading Solar Modules for Recycling via the SecondSol Marketplace

Through the SecondSol marketplace, operators, installers, and traders can offer used, defective, or decommissioned solar modules specifically for recycling purposes.

For this purpose, the platform provides a dedicated category called “Recycling.”

The process is straightforward:

1. Owners list old or damaged modules on SecondSol
2. The modules are listed with information such as quantity, type, and location
3. Recyclers or traders can directly find these offers
4. Transactions take place directly between buyer and seller

This approach creates several advantages.

For operators and installers:

• Easy marketing of larger module inventories
• Transparent demand from recyclers
• Reduced disposal and logistics efforts

For recyclers:

• Direct access to available module batches
• Better planning of recycling volumes
• More efficient logistics through bundled quantities

For the industry:

• Improved tracking of material flows
• More efficient circular economy in photovoltaics
• Higher recycling rates

Especially when dealing with larger commercial quantities of modules from solar parks, decommissioning projects, or warehouse inventories, digital marketplaces offer an efficient way to connect supply and demand.