Solar power is expanding rapidly as countries seek to increase renewable energy generation and reduce dependence on fossil fuels. However, behind the growth in solar installations is an emerging waste challenge: millions of photovoltaic panels will eventually reach the end of their useful lives.
What is now considered a waste problem could become a sizeable economic market.
The International Renewable Energy Agency (IRENA) estimates that the value of materials recovered from retired solar panels could exceed $20 billion annually by 2050. The opportunity will come from recovering materials such as aluminium, silver, silicon, copper and glass for reuse in manufacturing.
Why solar waste is becoming a concern
Solar panels are designed to operate for decades, typically around 25 to 30 years. As early installations begin reaching the end of their operating lives, the volume of panels requiring disposal, reuse or recycling will increase.
IRENA estimated global solar PV waste could rise from about 0.2 million tonnes in 2021 to four million tonnes by 2030, almost 50 million tonnes by 2040 and more than 200 million tonnes by 2050.
The increase reflects the scale of solar deployment globally. Solar PV capacity has expanded from a niche technology into one of the world’s largest sources of new power generation.
The more panels installed today, the larger the future waste stream.
Where is the $20 billion opportunity?
Solar panels contain materials that retain economic value after the panels stop generating electricity.
These include aluminium frames, glass, silicon, copper and small quantities of silver. Some photovoltaic technologies can also contain substances such as lead and cadmium that require controlled handling.
IRENA estimated that the materials recovered from end-of-life panels could be worth about $810m annually by 2030 and $6 billion by 2040, before rising above $20 billion a year by 2050. The value is not evenly distributed across the materials.
Aluminium is expected to account for a significant share of the recovered value, while silver could become particularly important because of its use in photovoltaic cells.
Recovering these materials also reduces the need to extract new minerals.
Recycling is not the only option
End-of-life solar panels do not necessarily have to go directly to recycling.
Some panels removed from large solar projects may still have sufficient performance for secondary applications. Testing, repair and refurbishment can extend their useful life and create a market for used panels. This creates three potential stages of value recovery:
Reuse: Panels that still meet performance requirements can be deployed in less demanding applications.
Refurbishment: Damaged or degraded panels can be repaired and returned to service where technically and economically viable.
Recycling: Panels that can no longer be reused can be dismantled and processed to recover materials.
The distinction matters because recycling generally destroys the original product, while reuse preserves more of the value embedded in the equipment.
The challenge of collecting panels
One of the biggest obstacles, according to IRENA, is logistics. Solar installations are spread across large geographical areas. A recycling facility needs sufficient volumes of panels to make collection, transportation and processing commercially viable.
The panels are also designed to withstand harsh outdoor conditions. Separating the different materials can therefore require specialised equipment and processes.
This means a recycling industry cannot depend only on the existence of waste. It needs an organised collection and processing system.
What does this mean for Africa?
Africa’s growing solar market gives the continent an opportunity to develop solar-waste infrastructure alongside new installations.
Nigeria is particularly relevant because solar deployment is increasing across households, businesses, mini-grids and other distributed-energy applications.
But the country’s solar expansion also raises questions about what happens to equipment installed today when it reaches the end of its operating life.
Nigeria’s solar waste is projected to increase significantly as installations expand. Without collection and recycling systems, obsolete panels could add to the country’s broader electronic-waste challenge.
The economic opportunity is therefore not limited to recycling plants.
A solar-waste industry could create activity across collection, transportation, testing, repair, refurbishment, dismantling, material recovery and manufacturing.
Why policy matters
The market is unlikely to develop at scale without clear rules. Governments can establish requirements for the collection and treatment of end-of-life panels, define responsibilities for manufacturers and importers, and create standards for refurbished equipment.
Extended producer responsibility is one approach. Under such systems, producers or importers bear some responsibility for products after they reach the end of their useful lives.
Such rules can also give investors greater certainty when considering recycling facilities and collection networks.
The bigger picture
Solar power is often described as a clean-energy technology. But the environmental benefits of solar do not eliminate the need to manage the materials used to manufacture and deploy it.
The challenge is to build a circular system in which solar equipment is not simply discarded when it stops generating electricity.
If panels are collected, reused, refurbished or recycled, the materials contained in them can return to the industrial economy.
That could reduce waste, support mineral security, create jobs and establish a new segment of the renewable-energy value chain.
The projected $20 billion annual value of recovered solar-panel materials by 2050 shows the scale of the opportunity.
For countries such as Nigeria that are still expanding their solar markets, the lesson is straightforward, planning for the end of a solar panel’s life needs to happen at the same time as planning for its installation.
The next phase of the solar industry may therefore not be only about generating more electricity from the sun. It could also be about recovering more value from the equipment that makes that generation possible.
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