Revolutionising solar manufacturing: new model predicts up to 8.2 gigatonnes of CO₂ savings by 2035

An international research team has modelled how changes to silicon photovoltaic manufacturing could substantially shrink the carbon burden of the global solar rollout, finding that a shift to newer cell architectures together with cleaner factories and greener grid electricity could avoid up to 8.2 gigatonnes of CO₂-equivalent emissions by 2035.

According to the paper published in Nature Communications by researchers at the University of Warwick, Northumbria, Birmingham and Oxford, the analysis compares the full life-cycle footprint of the incumbent passivated emitter rear cell (PERC) design with the emerging tunnel oxide passivated contact (TOPCon) architecture. The authors report that TOPCon performs better than PERC across fifteen of sixteen environmental impact categories modelled, delivering around a 6.5% reduction in climate-impact per unit of installed capacity. The study flags one material trade-off: higher silver use in TOPCon, which could increase pressure on critical mineral supplies.

“Multi terawatt‑scale photovoltaic manufacturing demands a sharper focus on its full environmental footprint”, said Dr Nicholas Grant of the University of Warwick. “Our paper shows how targeted improvements across the supply chain can deliver sustainable manufacturing at the terawatt-scale, avoiding twenty-five gigatonnes of manufacturing‑related CO₂ emissions if installed by 2035, while supporting rapid global deployment.” Senior author Professor Neil Beattie of Northumbria University added that the technology is central to cutting greenhouse gases as electricity demand rises for transport, heating and digital infrastructure.

The study underlines that where panels are made matters. Manufacturing on low‑carbon grids, exemplified by many European markets, significantly reduces upstream emissions compared with production tied to fossil‑fuel intensive electricity systems. When combined with factory process improvements and widespread TOPCon adoption, the authors estimate total manufacturing emissions reductions of up to 8.2 gigatonnes by 2035, roughly 14% of present‑day annual global emissions. Panels deployed from 2023 to 2035 are estimated to avert more than 25 gigatonnes of CO₂ by displacing fossil generation over their operating lives.

The findings arrive as industrial capacity and policy choices reshape regional clean‑tech supply chains. A report by Clean Investment Monitor on the US market shows a rapid acceleration in domestic solar manufacturing investment, from $0.9 billion in 2022 to nearly $6.0 billion in 2024, with projects online by early 2025 giving the United States component capacity measured in tens of gigawatts. These manufacturing investments, the report notes, will require sustained policy certainty if they are to scale fast enough to meet deployment targets and capture emissions savings domestically.

At the same time, analyses of global manufacturing and trade highlight divergent roles. Asia Daily’s assessment of Chinese clean‑technology exports finds they already contribute significant avoided emissions abroad, equal to around 220 million tonnes in 2024 and potentially billions over product lifetimes, underscoring how export flows can deliver decarbonisation benefits even when production is concentrated in single regions. International Energy Agency data, reported by media outlets, also points to a broader investment surge in clean‑tech manufacturing, with spending on solar PV fabrication more than doubling in recent years amid a wider $200 billion surge across key technologies.

The researchers’ caution about critical minerals resonates with policy and supply‑security moves elsewhere. Reporting in industry press indicates the United States has begun domestic extraction and refinement of metals that are scarce and strategically important to solar and semiconductor supply chains, aiming to ease dependence on single‑source suppliers and bolster energy security. For manufacturers and buyers, these material pathways will influence cost, resilience and the net environmental benefit of technology choices.

The paper’s life‑cycle results sit alongside country‑level modelling that shows the climate benefit of faster solar uptake. A Science Advances study cited in industry coverage estimates that increasing US solar share by 15% could cut annual CO₂ emissions from the power sector by more than 8.5 million tonnes, illustrating how deployment and manufacturing improvements both contribute to net emissions reductions.

For industrial decarbonisation professionals, the research frames practical trade-offs. Switching to TOPCon yields measurable per‑module environmental gains, but industrial planners must weigh increased precious‑metal demand, grid decarbonisation timetables and the geographic distribution of factories. According to the study, the greatest aggregate savings materialise only when technology transitions are paired with factory energy efficiency, lower‑carbon electricity for manufacturing, and strategic material supply solutions.

The authors present their conclusions as a roadmap for aligning manufacturing strategy with climate objectives: adopting higher‑efficiency cell designs, targeting process innovations, siting production where grids are cleaner, and addressing mineral supply risks. Industry stakeholders and policymakers seeking to maximise the climate return from multi‑terawatt solar expansion will need to coordinate investments, incentives and supply‑chain policies if the potential 8.2 gigatonne manufacturing saving and the larger operational emissions avoidance are to be realised.