Episode 56: Can Renewables Escape Their Own Waste Problem?

The following is the transcript of Episode 56 of The Solar Coaster Podcast. This episode features AI-generated voice narration of Anna Covert and Alex Herrera.

Full Episode Transcript

Anna Covert: The renewable energy story is usually told as a clean break from the fossil-fuel era: wind turbines on ridgelines, solar panels on rooftops, electricity without combustion. But today I want to start with the uncomfortable part. The machines that help cut emissions eventually become waste. Solar modules, wind blades, cables, frames, electronics: they do not vanish when their useful life is over. If the clean-energy transition is going to be truly clean, it has to confront end-of-life management, repair, reuse, and recycling as core infrastructure, not as an afterthought.

Alex Herrera: I agree that end-of-life management matters, but I think you are softening the scale of the problem. This is not a small housekeeping issue at the edge of the energy transition. Wind turbines installed in large numbers in the early 2000s are approaching the end of their expected 20-to-30-year lifespans. Solar panels may last longer, with some estimates reaching up to 40 years, but early models still raise the same question. What happens when the first big wave of renewable equipment ages out?

Anna Covert: That is exactly why circular economy models matter. The answer cannot simply be, “Recycle everything,” because recycling is often the last resort. Repairing a solar module so it can work longer may be cheaper and greener than breaking it down. Reusing a functioning module in a second-life application, including in remote or poorer communities that cannot afford the latest technology, can extend value before materials are recovered. Standards can help define when repair, reuse, or recycling is appropriate.

Alex Herrera: But “standards can help” is doing a lot of work there. We should be honest about the economics. Recycling solar modules can be expensive, especially when transport to specialized facilities is involved, and those facilities are described as few and far between. If companies can meet recycling targets by recovering heavier materials like glass, aluminum frames, and cables, they may have little incentive to deal with the difficult part: the module itself, especially the silicon and other lighter materials.

Anna Covert: That criticism is fair, but it is also why the standards discussion is important. Weight-based recycling targets can create the wrong incentives. Glass is relatively easy to recover and recycle, while silicon is tricky. Tony Sample, who chairs the IEC technical committee for solar PV systems, has put it bluntly: it is easy to meet targets by recycling aluminum frames, cables, and glass; the difficult part is the module itself. A mature circular system has to recognize that difference rather than hide behind tonnage.

Alex Herrera: Recognizing the difference is not the same as solving it. The material complexity of solar panels is real: silicon cells, glass, polymers, aluminum, copper, and electronics. If the business model does not work, good intentions do not move material. George Kelly has said that companies specializing in this area estimate more than 75% of a PV module can now be recycled thanks to better processing and sorting. That sounds promising, but he also says more needs to be done to industrialize recycling and bring costs down.

Anna Covert: Yes, and that is progress, not failure. A field does not move from early-stage difficulty to mature practice overnight. Mechanical recycling already exists in some forms, including disassembling solar modules and using the material in small pieces for road fill. That may not be the highest-value recovery pathway, and it will not satisfy every circular economy ambition, but it shows there are routes beyond landfill or incineration. The challenge is to make higher-quality, cost-effective pathways more common.

Alex Herrera: You keep saying “beyond landfill,” but the landfill problem is not theoretical. A waste-management company in the United Kingdom has estimated that roughly 350 million tonnes of e-waste is currently in landfills worldwide. The material from crushed solar panels and discarded wind blades is increasingly likely to become part of that burden if systems are not managed properly. That is the paradox: renewable energy is essential to net zero targets, yet the hardware can become electronic waste at scale.

Anna Covert: The paradox is real, but we should not confuse a problem with a verdict. Wind and solar remain fundamental tools for countries trying to meet net zero emission targets. The question is whether the industry treats asset lifecycle as a central design constraint. In wind, IEC 61400-28 sets out minimum requirements to extend the life of wind farm assets safely. That is a concrete move toward keeping equipment operating longer rather than prematurely retiring it.

Alex Herrera: Life extension is attractive, but I want to push on safety and performance. If wind turbines are used beyond their initial lifecycle, they must still operate safely and efficiently. That requires assessment, certification, and discipline. It cannot be a casual “just keep it running” philosophy. The material in the article says IECRE is working on an operational document on life extension of wind turbines. That suggests the sector knows this is complicated, not just a matter of good intentions.

Anna Covert: Absolutely. Circularity without safety would be irresponsible. The point of the IEC and IECRE work is precisely to create confidence that life extension is not guesswork. IECRE focuses on third-party certification and testing services for power plants producing, storing, or converting energy from wind, marine, and solar PV energy. If experts from the wind technical committee and the conformity assessment system work together, they can support circularity while protecting performance and safety.

Alex Herrera: But wind has an even uglier materials issue than solar in some ways: blades. Wind turbine blades are generally made from epoxy resin and other materials that are difficult to recycle. Epoxy resin is valued because it has mechanical strength, chemical resistance, and thermal stability. Unfortunately, those same properties make it almost impossible to recycle in the ordinary sense because it cannot be melted. So we have a material designed for durability that becomes a disposal problem precisely because it is durable.

Anna Covert: That is the central design tension. But there are emerging options. New materials, especially thermoplastic composites, are beginning to be used in turbine blade manufacturing because they can be melted down to extract reusable resin. Some new epoxy formulations are also designed to be recyclable. For existing blades, mechanical recycling has included smashing blades into smaller pieces for use in cement, concrete, or fibre boards for flooring and walls. Again, not perfect, but it is a pathway.

Alex Herrera: I am wary of calling that circular. Turning blades into filler for cement or boards may be better than dumping them, but it can also be a downcycling pathway. The original high-performance structure is not reborn as a new blade. And if the process still involves transport, processing energy, and greenhouse gas emissions, the environmental accounting has to be honest. Circular economy language can become too comforting if it makes every reuse sound equally valuable.

Anna Covert: That is a good challenge. Circular economy should not be a slogan where every output is treated as equally circular. It should be a hierarchy: maintain and repair first, reuse where practical, recycle when necessary, and only then consider lower-value recovery. The article’s framing supports that. Recycling is viewed as a last resort because it is costly, because recycling itself emits greenhouse gases, and because transport to specialized facilities adds impacts. Longer use can often be the greener option.

Alex Herrera: Then why is so much attention focused on recycling? Because repair and reuse are hard to standardize. With solar panels, you need to know whether a module is safe, whether it performs adequately, whether the repair is worthwhile, and whether second-life deployment is responsible. The pending IEC Publicly Available Specification for repair and reuse of solar panels may help, but until it is published and used, there is still uncertainty about how quickly practice will change.

Anna Covert: True, but the scenarios described by George Kelly are practical. In one case, a module may be easy and inexpensive to repair, so extending its working life makes sense. In another, the wider system may need replacement, while the module itself is still fine and can serve a second life. In a third case, recycling the materials is the right path. That is not vague idealism; it is a decision framework for different technical and economic conditions.

Alex Herrera: Decision frameworks are useful, but let me ask the sharper question: who pays? If transporting old modules to specialized facilities is costly, if sorting and processing require investment, and if the highest-value materials are difficult to recover, the circular model depends on someone bearing those costs. Regulatory incentives, such as the WEEE directive in Europe, attempt to stop e-waste from going to landfills or incinerators. But attempts are not guarantees. Regulation can set direction, but enforcement and economics decide outcomes.

Anna Covert: Costs are unavoidable, but they should be compared with the cost of unmanaged waste. The renewable industry has matured into a multi-billion-dollar sector, particularly wind, as Alistair Mackinnon has noted when discussing lifecycle challenges. A mature industry cannot externalize its end-of-life burden. If manufacturers, project owners, recyclers, standards bodies, and regulators align, the cost curve can improve. Kelly’s point about industrializing recycling is exactly about making the business model viable, not pretending it already is.

Alex Herrera: I still think the industry is late. If a massive number of wind turbines installed in the early 2000s are now approaching end of life, then the planning should already be mature. Solar may have a longer runway because panels can last up to 40 years by some estimates, but some early models were produced before the 2000s, so end-of-life questions are already here. The risk is that infrastructure growth outpaces circular infrastructure.

Anna Covert: Late is not the same as hopeless. The visibility of the issue is changing. The fact that technical committees are working on life extension, repair, reuse, and certification suggests the sector is moving from awareness to implementation. Standards are not glamorous, but they matter because they create common expectations. Without them, every actor can claim circularity on its own terms. With them, claims can be tested against minimum requirements, safety considerations, and agreed procedures.

Alex Herrera: Standards can help create trust, but they cannot eliminate material reality. Silicon remains tricky. Epoxy resin remains hard to recycle. Specialized facilities remain limited. Recycling based on weight can still privilege glass over more technically challenging components. And mechanical recycling into road fill, cement, concrete, or fibre boards may be better than disposal, but it does not fully close the loop. We should avoid telling listeners that the circular future has already arrived.

Anna Covert: I am not saying it has arrived. I am saying the direction is clear. The environmental conundrum is that wind turbines and solar modules are essential for reducing emissions while also adding to e-waste if mismanaged. Circular models are the route through that conundrum. They push the sector to design for longer life, repairability, second-life use, material recovery, and better end-of-life logistics. The alternative is to let clean-energy hardware repeat the waste patterns of older industrial systems.

Alex Herrera: And I am saying that route has steep terrain. If circularity is treated as a public-relations layer, it fails. If it is built into procurement, design, maintenance, certification, and regulation, it has a chance. For solar, that means looking beyond easy-to-recycle glass and frames. For wind, it means confronting the blade problem directly. For both, it means admitting that recycling is not free, not impact-free, and not always the best first option.

Anna Covert: That is a useful synthesis. The best circular economy strategy may be boring: inspect, maintain, repair, certify, reuse, and only then recycle with the best available process. It asks the industry to value time as much as material. A module that works safely for more years avoids immediate waste. A turbine that can operate beyond its initial lifecycle under safe conditions avoids premature replacement. A second-life solar module can deliver electricity where the newest technology is unaffordable.

Alex Herrera: But the boring strategy requires discipline. It requires clear criteria for what is safe to extend, what is fit for reuse, and what must be recycled. It requires investment in facilities and processing technologies. It requires avoiding perverse targets that reward only the heavy, easy materials. And it requires acknowledging that some current end-of-life pathways are transitional, not final answers. If the industry can admit that, it will be more credible.

Anna Covert: So maybe the debate is not whether circularity is necessary. It is whether the renewable energy sector will implement it deeply enough and soon enough. I think the work by IEC committees, the development of solar repair and reuse guidance, and the wind life-extension standard are signs of serious movement. They do not solve everything, but they create the scaffolding for safer, more consistent decisions across a global industry.

Alex Herrera: I can accept that. My concern is that listeners should hear both truths at once. First, solar and wind are essential to the energy transition and to net zero ambitions. Second, their equipment has a lifecycle, and that lifecycle has environmental consequences. The presence of standards and recycling estimates is encouraging, but the hard work is industrialization, cost reduction, logistics, and accountability. Without that, the clean-energy transition could inherit a preventable waste problem.

Anna Covert: Then the final takeaway is this: renewables do not become less essential because their hardware ages. But they do become less defensible if the sector ignores what happens after the first life of that hardware. A circular future for renewables is not just about recycling more. It is about using assets longer, repairing them when sensible, finding second lives when safe and useful, and recycling materials responsibly when there is no better option.

Alex Herrera: And the pressure should stay on. Circularity should be measured not by optimistic language, but by whether fewer modules and blades end up as unmanaged waste, whether difficult materials are addressed rather than ignored, and whether extended-life assets remain safe and efficient. If that happens, wind and solar can better match their climate promise with material responsibility. If it does not, the paradox at the heart of renewable energy will become harder to defend.