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The energy transition is happening at an unprecedented speed. According to the latest report from the IEA-PVPSIn 2024 alone, 601 GW of solar power was installed in the world, reaching a cumulative total of 2.2 TW. However, this success hides an environmental paradox. As researcher Rabia Charef warns At The Conversation, we are installing the future on a mountain of potential garbage that, by design, is an “industrial strength sandwich” almost impossible to separate. The “sandwich” design: a durability trap. For a panel to withstand hail, snow and wind for 30 years, it is built by stacking layers of glass, silicon and polymers sealed with adhesives so powerful that they become a single unit. As Charef explainsthis virtue is also its condemnation, since at the end of its useful life the separation of materials is so expensive that most end up in the landfill. It is not a minor problem. Already in 2016, IRENA reports They warned that by 2050 solar waste could total 250 million tons, which would represent 10% of all electronic waste on the planet. China and the “poison” of overproduction. The clock on this crisis has sped up due to geopolitics. China dominates 90% of global capacity of solar cells and in this desire to lead the sector, the Asian giant manufactured 588 GW last year, doubling global demand. This flood of cheap panels has sunk prices and caused million-dollar losses, but also has created a perverse incentive: It is so cheap to buy a new panel that repairing an old one does not seem profitable. Analyst Bo Zhengyuan explains that that “animal spirit” that made the Chinese industry triumph is now suffocating it, filling the world with equipment that will die in two decades without an exit plan. The laboratory of saturation. For its part, another problem that is committed is forgetting the fundamentals, as happens in Spain. The country broke records last summer by generating more than 10,500 GWh per month of sun and wind, but the system cannot hold up. Spain already waste 7% of its clean energy due to lack of networks and storage. “The mistake was not putting up panels, but forgetting about the networks,” quotes an executive in the Financial Times. This lack of investment has plunged the value of solar parks by 30% in just one year, forcing “liquidation sales” (fire sales). If the companies that run these plants go bankrupt or lose profitability, who will take care of the millions of panels when they stop working? The limit of current recycling: shredding is not recovering. Today, recycling is disappointing. As The Conversation denouncesmost plants simply shred the panels to recover low-value aluminum and glass. In the process, the true treasure is lost: high-purity silver, copper and silicon. Silver, although it only represents 0.14% of the weight of the panel, represents 40% of its material value. When crushed, this metal is pulverized and mixed with impurities, making it unrecoverable. According to sourceswe are throwing away an estimated economic value of $15 billion by 2050. Although there are sprouts of hope. Despite the panorama, technology is trying to catch up with the problem: Silver Recovery: Researchers from the University of Camerino (Italy) have developed a hydrometallurgy technique that recovers 99% of pure silver without using harsh chemicals. The milestone of the 100% recycled panel: The Chinese giant Trina Solar has achieved create the first fully recycled crystalline silicon panel. Although its efficiency (20.7%) is somewhat lower than that of a new one (25%), it demonstrates that circularity is possible and that the performance of recycled material is already fully competitive compared to current industry standards. Cutting-edge plants in Spain and the US: While in the United States the company SolarCycle seeks to recover 99% of photovoltaic materials; in Spain, the CERFO project in Teruel positions itself as a European pioneer in the recovery of silicon, a component historically difficult to recycle. Repair before recycling: “Revamping”. Before the panel reaches the recycling plant, there is a more sustainable option: the revamping. A study by the University of Castilla-La Mancha shows that renewing Specific components of a solar plant can maximize production and profitability without the need for total dismantling. In Japan, the startup Girasol Energy has achieved restore the oldest solar system in the country (from 1994), aiming for it to operate for 50 years by using Big Data to identify faults piece by piece without replacing the entire equipment. Digital passports and modular design. The definitive solution could come from regulation. The European Union will implement the Digital Product Passport (DPP) starting in 2027. As the EU source explainsthis document will allow you to know the origin, materials and disassembly instructions for each panel. This passport, along with the “digital twins” mentioned in The Conversationwill allow technicians to monitor performance in real time and know exactly how to separate the “sandwich” of materials without destroying them. Faced with the solar paradox. Solar energy is essential to stop global warming, but it cannot be “clean” if its end is dirty. The industry now faces its biggest test: redesigning the panels not only so that they catch the sun, but so that, when their last sunset comes, they don’t leave behind a legacy of glass and plastic that future generations cannot manage. Image | freepik Xataka | All the solar panel technologies that exist and which ones are most efficient, in a graph that goes from 1975 to today