There is a version of sustainability that asks a great deal from people – different diets, different modes of transport, and different relationships with consumption. And then there is a version that happens quietly, invisibly, in industrial facilities most drivers will never visit, driven by regulations, economics, and engineering ingenuity rather than individual lifestyle choices.
The second-life automotive parts economy is the latter kind of sustainability. It does not require anyone to change how they drive. It operates through the decisions made by recyclers, manufacturers, and parts buyers as vehicles reach the end of their useful life. And its environmental impact – measured in millions of tonnes of CO2 avoided annually, in raw materials not extracted, in energy not expended on industrial manufacturing – is more significant than almost any other single intervention in the automotive sector’s environmental footprint.
The carbon logic of the circular part
The starting point for understanding why second-life parts matter environmentally is the carbon embedded in manufacturing. The popular mental model of a car’s environmental impact focuses on exhaust emissions during use – the CO2 that comes out of the tailpipe over the vehicle’s lifetime. But that framing misses a substantial portion of the picture.
Manufacturing a vehicle from new materials is enormously energy-intensive. Steel must be smelted, aluminium refined, copper extracted and processed, plastics synthesised from petrochemicals, and electronic components assembled from components whose raw materials come from some of the most energy-intensive extraction processes on earth. The automotive industry is, according to the European Commission, the world’s largest consumer of aluminium (42% of global demand), magnesium (44%), platinum group metals (63%), and natural rubber (67%). This production chain generates emissions before a single kilometre has been driven.
When a functional part from an end-of-life vehicle is removed, tested, and installed in another vehicle instead of being recycled for raw materials or landfilled, the manufacturing chain for a replacement part is simply not triggered. According to data from the ADEME, reusing a single automotive part avoids on average 75% of the greenhouse gas emissions that would have been generated by manufacturing its equivalent new. Studies cited by industry bodies suggest the figure reaches 80% for many component categories. The Ellen MacArthur Foundation, which has documented Renault’s circular economy operations in detail, notes that on a global scale, the energy that could be saved through widespread automotive remanufacturing would be equivalent to the output of eight nuclear power stations.
That is the carbon logic: reuse avoids manufacturing. The more parts that complete a second life in running vehicles rather than being shredded and melted, the greater the reduction in the sector’s material extraction and production emissions.
What the numbers look like at scale
The scale of what is already happening is larger than most people realise. The automotive recycling industry processes approximately 12.6 million vehicles per year globally, and the Alliance of Automobile Manufacturers has estimated that this activity reduces greenhouse gas emissions by more than 30 million metric tonnes per year – a figure equivalent to taking roughly six million cars off the road entirely.
In Europe, automotive remanufacturing alone – the industrial-grade restoration of used parts to OEM specifications – saved 800,000 tonnes of CO2 in 2020 according to research cited by BIS Research. That figure has grown as remanufacturing operations have scaled.
The numbers at a part level are equally striking. Renault Trucks has documented that remanufacturing a part requires up to 85% less raw materials and 80% less energy than producing an equivalent new part. Across its repair network in 2022, the company’s remanufactured parts saved a combined total of over 1,900 tonnes of CO2, the equivalent of the emissions generated by a high-speed train travelling 800,000 kilometres. At the individual vehicle level, research has found that remanufacturing can achieve a total reduction of approximately 3,800 kg of CO2 per end-of-life vehicle compared with conventional recycling pathways.
Renault Re-Factory: a former production plant becomes a circular economy hub
Perhaps the most visible commitment to the second-life parts economy from a major manufacturer is Renault’s Re-Factory at Flins, in the Paris region – a former vehicle production plant that ended car manufacturing in 2024 and has been systematically converted into what the company describes as Europe’s first factory dedicated entirely to the circular economy of mobility.
The Re-Factory operates through several interconnected activities. The Remakers division – the direct descendant of a remanufacturing operation that began in Choisy-le-Roi in 1949 – handles the industrial restoration of mechanical, mechatronic, and electrical parts. In 2024, The Remakers gave a new lease of life to 350,000 parts across 11,000 different references, each carrying the same warranty and quality as a new part. The Renew Factory on the same site reconditions used vehicles for the second-hand market. A retrofit division converts combustion vehicles to electric powertrains, enabling vehicles to continue operating in low emission zones after the combustion powertrain would have disqualified them.
The Re-Factory also runs a start-up incubator supporting circular economy ventures, and has supported more than 30 start-ups in developing industrial circular economy solutions. It is, in Renault’s framing, not a single facility but an interconnected ecosystem – a model for what a post-production automotive site can become when its industrial expertise is redirected from making new things to extending the life of existing ones.
Stellantis SUSTAINera: the 4R strategy at industrial scale
Stellantis has built its circular economy operations around a dedicated business unit – SUSTAINera, launched in 2022 – which operates on a four-pillar strategy: Remanufacturing, Repair, Reuse, and Recycling. The SUSTAINera Circular Economy Hub at Mirafiori, Turin, covers 73,000 square metres and handles engine and gearbox remanufacturing, EV battery repair, vehicle reconditioning, and dismantling of end-of-life vehicles to recover functional components.
The results reported in April 2026 illustrate the pace at which this operation is scaling. More than 28,600 engines were remanufactured at the Turin hub in 2025 – nearly triple the 2024 volume. SUSTAINera Reuse business grew 51% compared to the previous year. The total inventory on the B-Parts e-commerce platform, through which SUSTAINera sells reused parts, now exceeds 15 million parts for all makes and models across Europe and North America. A third Vehicle Dismantling Center is in the process of being announced for a new region, following those already operational in Turin and São Paulo.
LifeGate, the sustainability media outlet that has covered SUSTAINera’s operations extensively, describes the programme’s environmental impact as both an environmental necessity and a driver of industrial innovation. Stellantis’s own lifecycle analysis, conducted to European standards and verified by an independent third party, finds that its remanufactured and reused parts achieve up to 80% savings in raw materials and up to 50% reduction in CO2 emissions compared to equivalent new parts. The components described as “up to 70% more affordable than new parts” by SUSTAINera’s SVP for Global Circular Economy are thus simultaneously more affordable and significantly less carbon-intensive than their new equivalents.
The second life of EV batteries: energy storage beyond the road
One of the most compelling developments in the second-life parts economy is happening not in workshops but in energy infrastructure. Electric vehicle batteries that have degraded below the threshold suitable for automotive use – typically defined as below 70-80% of original capacity – still retain substantial energy storage capability. That residual capacity, rather than being written off, is increasingly being channelled into second-life stationary energy storage applications: grid balancing services, renewable energy storage, commercial and industrial energy management, and backup power systems.
Stellantis has provided a concrete example through SUSTAINera. In 2025, the company contributed EV battery modules to the PIONEER energy storage system at Rome Fiumicino Airport. Over the year, the volume of energy from EV batteries sold to third parties for second-life use grew more than fourfold, reaching 123,000 kWh. Renault, which retained ownership of most Zoe batteries through lease arrangements with customers, has been directing end-of-life packs to stationary storage use on the Flins site itself – powering the Re-Factory with the batteries from the very vehicles that were once built there.
The environmental logic of this pathway is powerful. An EV battery requires approximately five to fifteen tonnes of CO2-equivalent to produce, depending on the chemistry and the energy source used in manufacturing. A battery that serves both an automotive use phase and a subsequent stationary storage phase amortises that manufacturing carbon over a much longer active period – reducing the effective carbon intensity per unit of energy stored or per kilometre driven.
The raw material equation
Beyond carbon, the second-life parts economy addresses a resource challenge that is likely to intensify over the coming decades. The automotive industry’s dependency on specific raw materials – lithium, cobalt, nickel, rare earth elements, platinum group metals – creates supply chain vulnerabilities and extraction impacts that new vehicle manufacturing multiplies with each unit produced.
A modern vehicle contains between 10 and 20 kg of copper alone, alongside significant quantities of aluminium, steel, and increasingly, battery-grade lithium and cobalt. The European Commission’s proposed ELV Regulation, adopted by the European Parliament in September 2025, anticipates that tighter recycling rules will unlock the recovery of 5-6 million tonnes of steel, 1-2 million tonnes of aluminium, and 0.2-0.3 million tonnes of copper from European end-of-life vehicles – materials that would otherwise need to be newly extracted and processed. Mandatory recycled plastic content requirements phase in over the next decade, targeting a minimum of 25% recycled content in new vehicles.
The reuse hierarchy – where a functional part reused directly in a running vehicle is categorically preferable to a part recycled for raw materials, because reuse preserves the embedded industrial value of the component – sits at the top of this materials logic. Recovery of raw materials is better than landfill. Remanufacturing is better than raw material recovery. Direct reuse is better than remanufacturing. Each step up the hierarchy retains more of the energy and materials already invested in the component.
What this means for the buyer of used parts
The environmental case for second-life automotive parts described in this article is not an abstraction that operates at a remove from ordinary repair decisions. It is the direct consequence of individual sourcing choices aggregated across millions of vehicles.
When a driver or a garage chooses a used OEM part from a verified European recycler over a new equivalent, they are extending the active life of a component whose manufacturing has already occurred – and preventing the triggering of the manufacturing chain for its replacement. Platforms like OVOKO, which aggregate tested used parts from thousands of verified professional dismantlers across Europe, provide the practical infrastructure through which this environmental logic becomes accessible. The VIN-based compatibility tools, documented donor mileage, and professional seller verification that characterise the best platforms are not just conveniences for the buyer: they are the quality infrastructure that makes second-life parts a reliable choice rather than a gamble.
The global automotive circular economy market is projected to grow from approximately $210 billion in 2026 to $346 billion by 2031, according to GII Research – a compound annual growth rate of 10.5%. That growth reflects both regulatory pressure and an accelerating recognition that the most resource-efficient vehicle is one that is already built. The innovation happening in automotive recycling in 2026 – at Renault’s Re-Factory, in Stellantis’s Mirafiori hub, in the digital platforms connecting European dismantlers with buyers across the continent – is the industrial expression of a principle that applies equally at the scale of a single repair: keeping what already exists in service is almost always better for the planet than making something new.
