Glass Recycling Is the New Currency: What Merchants Need to Know About VOLTA

On 24 June 2026, Saint-Gobain announced that its VOLTA joint project with AGC had completed its first full year of continuous operation since starting up in early 2025 [1]. This hybrid-melting pilot furnace represents a technical shift that directly impacts how European builders’ merchants procure flat glass [1]. The furnace operates on a 50% share of electricity and an 88% cullet (recycled glass) ratio in standard operation, compared with just 40% previously [1]. Saint-Gobain and AGC claim that this hybrid technology delivers a 66% reduction in fossil fuel consumption and a 71% reduction in Scope 1 and 3 CO2 emissions, covering gas and raw materials only under Innovation Fund accounting [1].

This technological leap arrives amid a severe supply bottleneck. How do procurement directors secure high-margin, low-carbon glazing allocations when manufacturers cannot find the recycled raw materials to produce them? The answer lies in a fundamental shift in the merchant’s role: transitioning from a passive distributor of finished goods into an active partner in the secondary raw materials supply chain.

To understand the scale of the challenge, merchants must look at the raw numbers. Approximately 10 million tonnes of flat glass are placed on the European market annually, with 80% of this volume destined for the building sector, according to a joint position paper published on 3 November 2025 by EuRIC [3]. Despite this massive volume, the closed-loop recycling rate of flat glass back into new flat glass remains marginal [3].

Currently, there are no specific EU recycling targets for flat glass [3]. However, the industry is pushing for change. The 2025 joint position paper from EuRIC calls for the establishment of a minimum recycled content target of 15% for flat glass [3].

For manufacturers, achieving the high cullet ratios demonstrated by the VOLTA pilot (88% in standard operation) is not just a technical achievement; it is a resource dependency [1]. Manufacturers cannot scale low-carbon glass production without a massive, steady influx of clean, recycled flat glass. Because the current closed-loop recycling rate is so low, access to recycled glass, rather than manufacturing capacity alone, will dictate which suppliers can deliver low-carbon glazing to the market [3]. This means that merchants who can help secure this raw material will be first in line for product allocations.

This supply squeeze is happening against a backdrop of tightening European environmental legislation. According to the European Commission, the EU’s circular material use rate stands at 11.8%, with an official goal to double this rate to 24% by 2030 [5].

To achieve this target, the EU is deploying a range of regulatory instruments. The Ecodesign for Sustainable Products Regulation (ESPR) entered into force in July 2024, setting the stage for stricter product durability and recycled content requirements [5]. This was followed by the new Regulation on Packaging Waste (PPWR), which entered into force in February 2025 to harmonise national measures for secondary raw materials, manufacturing, recycling, and reuse [5]. Additionally, the new Construction Products Regulation ((EU) 2024/3110) introduces further compliance layers for construction products in the single market [2].

The most significant upcoming legislative driver is the Circular Economy Act, for which the European Commission is expected to present its proposal in the course of 2026 [5]. According to the Commission, this act aims to establish a Single Market for secondary raw materials, increase the supply of high-quality recycled materials, and stimulate demand for these materials within the EU [5].

For builders’ merchants, these regulations mean that the materials they sell will increasingly be subject to strict end-of-life and recycled-content mandates. Procurement directors can no longer treat sustainability as a marketing exercise. It is now a core regulatory compliance issue that affects product availability and supplier viability. Once the Circular Economy Act completes the EU legislative process, it is intended to create a structured framework for secondary raw materials, making recycled content a key specification metric for public and private construction projects alike [5].

For decades, the relationship between builders’ merchants and glass manufacturers was purely transactional: merchants placed orders, and manufacturers delivered crates of glass. The rise of low-carbon glass and hybrid manufacturing technologies like VOLTA changes this dynamic entirely [1]. Procurement is becoming a resource-exchange agreement.

If a merchant wants to secure allocations of high-margin, low-carbon glazing to satisfy the demands of sustainability-conscious contractors, they must offer something in return. That something is clean cullet.

Merchants are uniquely positioned to solve the manufacturers’ raw material problem. They sit in the middle of the supply chain, maintaining daily contact with the contractors, installers, and deconstruction companies who remove old windows from buildings. By establishing collection points and logistics networks for end-of-life glazing, merchants can aggregate the clean recycled glass that manufacturers desperately need.

This strategy transforms the merchant’s value proposition. Instead of competing solely on price or delivery times, merchants can leverage their waste-collection capabilities to negotiate guaranteed stock allocations and better commercial terms with manufacturers. It also deepens the merchant’s relationship with contractor customers, who are increasingly looking for simple, compliant ways to dispose of construction and demolition waste. In a market where landfill costs are rising and disposal regulations are tightening, offering a convenient takeback service for old glazing is a powerful differentiator.

To prepare for this shift, procurement and commercial directors should take several concrete steps:

First, audit current supplier relationships. Ask glass and glazing suppliers about their long-term cullet requirements and whether they plan to offer allocation preferences to distributors who facilitate material takeback.

Second, evaluate yard logistics. Assess whether existing merchant locations have the space and operational capacity to host dedicated collection containers for flat glass waste.

Third, engage with contractor customers. Start conversations with window installers and deconstruction companies to understand their current waste disposal costs and their willingness to participate in a merchant-led recycling program.

The transition to a circular economy presents both a risk and an opportunity for European building materials merchants. The risk is clear: merchants who remain passive distributors may find themselves cut off from high-margin, low-carbon product lines as manufacturers restrict allocations to partners who can supply secondary raw materials.

The opportunity, however, is substantial. By actively participating in the collection and supply of recycled glass, merchants can secure their product pipelines, protect their margins, and establish themselves as indispensable partners to both manufacturers and contractors in a resource-constrained market.

[1] saint-gobain.com — https://www.saint-gobain.com/en/news/volta-one-year-demonstrating-hybrid-melting-industrial-scale [2] eur-lex.europa.eu — https://eur-lex.europa.eu/legal-content/NL/ALL/?uri=CELEX:32024R3110 [3] euric.org — https://euric.org/resource-hub/position-papers/joint-position-paper-from-flat-to-circular-rethinking-glass-in-construction [5] environment.ec.europa.eu — https://environment.ec.europa.eu/strategy/circular-economy_en