The Circular Economy of Solar: From Installation to Recycling
What will it take for us to get there?
Solar panels are being installed at an unprecedented pace as the world embraces clean energy solutions. In 2023 alone, the world added a record 447 Gigawatts (GW) of new solar photovoltaic (PV) capacity, the largest annual growth in history. This surge is part of a long-term trend, as global solar PV capacity has skyrocketed from just 3.7 GW in 2004 to an astonishing total 1,589 GW in 2023 — an increase of 428 times in just two decades. To put it another way, that's equivalent to adding nearly the entire solar capacity of 2004 every 17 days for the past 20 years.
But what happens when these solar panels reach the end of their lifespan? Without robust end-of-life (EOL) management, the International Renewable Energy Agency (IRENA) estimates that solar panel waste could reach 78 million tons by 2050 globally. Given an estimated lifetime of 20-30 years, the dilemma of how to handle large volumes of end-of-life PV modules is just beginning to emerge — but a key aspect in the circular economy of solar panels is that they’re recycled properly.
Even though the European Union has a law that specifically includes properly recycling photovoltaic panels in support of the shift to a circular economy, the U.S. largely doesn’t yet, with the exception of a state law in Washington. Currently, only 10% of solar panels in the U.S. are recycled, with the majority ending up in landfills.
At Electra, we are committed to making solar panels as sustainable at the end of their lifecycle as they are during their clean energy production. Our mission is to ensure that decommissioned panels are responsibly managed, valuable materials are recovered, and waste is minimized.
Before diving into how the circular economy applies to solar energy and how Electra is creating a comprehensive system to support this market, let’s get a handle on what it means practically.
What is the Meaning of a Circular Economy?
A circular economy is a system designed to minimize waste and make the most of resources. Unlike the traditional “take, make, dispose” model, a circular economy keeps products, materials, and resources circulating for as long as possible.
The idea is simple: design out waste, keep materials in use, and regenerate, similar to natural ecosystems.
In practice, this might mean refurbishing old products, recycling materials to create new ones, or finding innovative ways to extend the life of existing goods. However, as solar researcher Meng Tao explains, there are major challenges and opportunities to explore here, and we’ll get into specifics shortly.
For the solar industry, the circular economy represents a shift from simply producing and disposing of solar panels to rethinking the entire lifecycle of these products — from installation to eventual recycling and reuse. Specifically, this could mean designing solar panels for easier disassembly, extending their operational lifespan through maintenance and refurbishment, and ensuring materials are recycled back into the production cycle.
Applying Circular Economy Principles to Solar Energy
Now that we know the basics, let’s explore how the principles of a circular economy — designing out waste, keeping products in use, and leveraging principles of regenerative natural systems — apply to the solar industry.
Designing Out Waste
The first principle of the circular economy is to design products that minimize waste from the start. In the context of solar energy, this means creating panels that are easier to disassemble and recycle at the end of their life. Redesigning solar panels with recycling in mind could reduce the environmental impact of solar energy by simplifying the materials recovery process. The International Energy Agency (IEA) specifies a set of general “design for recycling” (DfR) guidelines, and the article "Design for Recycling Principles Applicable to Photovoltaic (PV) Modules" in the Journal of Sustainable Metallurgy provides more specific examples of how PV panels can be designed to improve their recyclability:
Material Selection: Using fewer types of materials and choosing materials that are easier to separate during the recycling process. This study investigates the potential of using natural fiber composites as eco-friendly alternatives to conventional polyethylene terephthalate (PET) back sheets in solar panels. Or instead of using multiple types of polymers, a single, recyclable plastic could be used for all panel components.
Modular Design: Designing PV panels in a modular way, where components such as glass, aluminum frames, and silicon cells can be easily separated without damaging the materials, thereby increasing the efficiency of the recycling process.
Labeling and Documentation: Including clear labeling on the materials used in PV panels can guide recyclers in identifying and properly sorting different components, which is particularly important for materials that require specific recycling methods.
Reducing Hazardous Materials: Reducing or eliminating the use of hazardous substances in PV panels, such as lead or cadmium, which complicate the recycling process and pose environmental risks. Using lead-free solder in modules or other lead alternatives is also possible.
By adopting these design principles, the solar industry can significantly improve the recyclability of PV panels, leading to better resource recovery and reduced environmental impact.
Keeping Products in Use
Another core principle is to keep products and materials in use for as long as possible. This can be achieved through reuse, refurbishment, or repurposing.
For example, Electra is partnering with Equitable Solar Solutions (ESS), a non-profit that trains volunteers to assess and safely install reused solar panels. Together, we’re developing an online training curriculum and optimizing logistics to ensure that decommissioned panels are efficiently directed to communities in need. Our collaboration aims to extend the overall life of panels, reduce waste, and provide clean energy access while fostering job skills and economic opportunities in underserved areas.
Regenerating Natural Systems
Finally, the circular economy emphasizes the importance of regenerating natural systems, ensuring that any resources extracted from the environment are used efficiently and returned in a way that benefits the ecosystem. Recycling solar panels allows valuable materials like silicon, silver, copper, and aluminum to be recovered and reused, reducing the need for new mining operations and the associated environmental impact — and the most recent technologies make it possible to extract 95% of those high-value metals contained in PV panels.
Research led by scientists at the National Renewable Energy Laboratory (NREL) also advocates for developing advanced recycling methods where all metals and minerals are recovered with high purity. Garvin Heath, a senior environmental scientist, suggests that these methods could involve using heat or chemical treatments to separate glass from silicon cells, followed by other techniques to purify silicon and trace metals.
The Lifecycle of a Solar Panel
With the principles of the circular economy in mind, let’s take a closer look at the lifecycle of a solar panel — from installation to its eventual end-of-life (EOL).
Installation
Solar panel installation has skyrocketed in recent years, with millions of panels now generating clean energy across the globe. As the International Renewable Energy Agency (IRENA) explains, these panels are designed to last between 20 to 30 years, with minimal maintenance required during their operational life.
Operation
Once installed, solar panels convert sunlight into electricity, gradually losing efficiency over time. Even after decades of use, many panels continue to produce electricity, albeit at a reduced capacity. Researcher Benjamin Mow at NREL explains, “The reduction in solar panel output over time is called degradation. NREL research has shown that solar panels have a median degradation rate of about 0.5% per year, but the rate could be higher in hotter climates and for rooftop systems. This means that in year 20, the module is producing approximately 90% of the electricity it produced in year 1.”
The operational phase is where panels deliver the bulk of their environmental benefits, but it’s also where the challenge of eventual disposal starts to loom.
End-of-Life (EOL)
When solar panels reach the end of their useful life, they become part of the growing challenge of solar waste. Without proper EOL management, these panels could end up in landfills, contributing to environmental pollution. As mentioned, NREL and IRENA estimate the volume of modules no longer needed could total 78-80 million metric tons by 2050 globally, and the U.S. accounts for approximately 12.78% of solar energy — or 9.97 million metric tons. This is where the circular economy model becomes crucial — ensuring that these panels are either reused, refurbished, or recycled rather than discarded.
Challenges in Solar Panel Recycling
While the circular economy offers a promising solution, there are still significant challenges to implementing effective recycling processes for solar panels.
1. Complex Composition
As discussed, PV panels are made up of multiple layers of materials, including glass, silicon, and various metals, all tightly bonded together with plastic polymers.
“A solar panel is essentially an electronic sandwich. The filling is a thin layer of crystalline silicon cells, which are insulated and protected from the elements on both sides by sheets of polymers and glass. It’s all held together in an aluminum frame. On the back of the panel, a junction box contains copper wiring that channels electricity away as it’s being generated,” writes Amelia Bates at Grist.
Think of it all bonded together as a grilled cheese sandwich — this complexity makes recycling difficult and requires specialized processes to separate and recover these materials.
2. No Standardized Infrastructure for EOL
The U.S. currently lacks a standardized, nationwide infrastructure for solar panel recycling. A recent study highlights that the U.S. solar panel recycling infrastructure remains highly fragmented, with efforts largely limited to local and regional initiatives rather than a comprehensive national system. This lack of a system greatly hinders the efficient management of end-of-life solar panels across the country.
3. Low Recycling Rates
Despite the potential for recycling, less than 10% of solar panels are currently recycled, resulting in an annual loss of recoverable materials worth over $15 million in the U.S. alone, according to the National Renewable Energy Laboratory. This low rate represents both a missed opportunity for resource recovery and a growing environmental concern as the number of decommissioned panels increases.
Electra’s Innovative Solution
So, how does Electra fit into all of this?
Electra Network is directly addressing these challenges by developing a practical solution that integrates circular economy principles to ensure a sustainable future for solar panel management.
Solar Panel Registry:
Electra’s Solar Panel Registry is a user-friendly software platform that tracks panels from installation to end-of-life, ensuring they are reused or recycled rather than discarded. We use QR code technology to create a digital 'passport' for each panel, enabling real-time tracking from installation through potential reuse to final recycling, thus ensuring accountability throughout the panel’s lifecycle. This registry integrates with existing workflows in each stage, making it easier for stakeholders to manage the entire lifecycle of solar panels.
Product Stewardship Program:
Our Product Stewardship Program streamlines the logistics of collecting and transporting solar panels for recycling or reuse. It optimizes collection routes and consolidates shipments, potentially reducing transportation costs and associated carbon emissions compared to ad-hoc recycling efforts. By creating a digital platform that connects stakeholders on the ground across state lines, Electra maximizes resource recovery and minimizes environmental impact, promoting a more efficient circular economy in the solar industry.
Reuse and Recycling Goals:
While the current industry average for solar panel recycling is below 10%, Electra aims to set a new standard by diverting 95% of collected panels from landfills to recycling or reuse projects, a goal that aligns with the most ambitious circular economy targets in any sector. Through partnerships with nonprofits and high-recovery recyclers, Electra ensures that panels are repurposed effectively, supporting both environmental sustainability and community development. A study by Kai Chen Goh et. al. (2024) supports the notion that effective recycling strategies can recover up to 95% of a solar panel’s materials, making significant strides towards sustainability.
Benefits of Electra’s Approach
Electra’s approach to solar panel management offers significant environmental and economic benefits, firmly rooted in circular economy principles.
Environmental Impact Reduction:
Electra significantly lowers the environmental footprint of solar energy. By redeploying used panels, we increase carbon offsets considerably - by adding another 10-15 years of production. By diverting solar panels from landfills, Electra's approach could prevent the release of up to 34 million metric tons of CO2 equivalent by 2050 in the US.
We arrive at these numbers based on projections from the International Energy Agency and IRENA: as discussed above, the U.S. accounts for 12.78% of solar energy globally, or 9.97 million metric tons — and research indicates 0.8-1.2 metric tons of CO2 are saved per metric ton recycled.
Our program also helps conserve raw materials by recovering valuable components from used panels, aligning with the circular economy’s goal of regenerating natural systems.
Economic Growth:
Electra’s model creates jobs in the recycling and refurbishment sectors, stimulates the economy through material recovery, and provides low-cost solar energy options for underserved communities. The economic benefits are reinforced by studies like those from Martin Geissdoerfer et al. (2017) which show the potential for job creation and industry growth in a circular economy.
Compliance and Innovation:
Electra’s system meets and exceeds regulatory requirements, offering a flexible solution that is adaptable to various state regulations. Washington State's Photovoltaic Module Stewardship and Takeback Program mandates manufacturers to provide convenient and environmentally sound recycling for solar panels sold after July 1, 2017. Electra’s PV Stewardship Plan is designed to set a new standard for solar panel stewardship, with the potential for nationwide expansion, contributing to the broader adoption of a circular economy in the solar industry.
What’s the Future of Solar Circularity?
Electra’s vision for the future of solar energy is deeply rooted in the principles of a circular economy — and we’re working to create a robust, nationwide network.
What does that require? Collective action.
Electra has grown from a concept to a beta prototype in under a year, and we are looking for manufacturers, installers, developers, and panel project owners to join us and invest in the circular market for recovered materials.
Our platform streamlines connections between assessors, project sites, and panel inventories, making donations and installations more efficient and cost-effective. It also helps non-profits like Equitable Solar Solutions and Brighten Haiti to meet grant requirements and offsets shipping costs for members.
We recognize the challenges faced by the entire industry: tight margins, material demand, and varying labor conditions across the globe. The first crucial step is addressing the logistical and collection challenges. Ensuring decommissioned PV panels reach our network partners enables recyclers to focus on refining the process and improving the recovered material supply chain.
Proactive EOL planning is how we ensure — together — that solar energy remains sustainable from installation to recycling.
The circular economy of solar is not just a concept; it’s a practical approach to ensuring the long-term sustainability of solar energy. Electra Network provides the tools and infrastructure to keep solar panels in use and out of landfills.
Join us in this journey, and let’s make solar energy a model for environmental stewardship and economic resilience.
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We want to hear from you — get in touch at https://goelectra.io.