Green Hydrogen to Reduce CO2 Emissions in Asphalt Plants

The global push toward net-zero emissions has long targeted the “low-hanging fruit” of energy transitions—passenger vehicles and residential heating. However, the industrial sector, particularly the production of infrastructure materials like asphalt, has remained a stubborn challenge due to the extreme heat required for processing. For decades, the industry has relied on fossil fuels to heat aggregates and bitumen, leaving a significant carbon footprint on the very roads designed to connect the world.

A pivotal shift is now emerging through the integration of green hydrogen for asphalt production, a technology that promises to decouple road construction from carbon emissions. By replacing traditional natural gas or oil burners with hydrogen-ready systems, the industry is moving toward a future where the foundation of our transport networks is virtually emissions-free.

This transition is not merely theoretical. In Northern Europe, pioneering collaborations between technology providers and construction firms are already demonstrating that a complete shift to green hydrogen can drastically reduce the specific CO2 emissions of asphalt mixing plants. The move represents a critical step in meeting the stringent climate targets outlined in the Paris Agreement, providing a blueprint for heavy industry globally.

The Carbon Challenge in Road Infrastructure

To understand why hydrogen is a game-changer, one must first understand the energy intensity of asphalt production. Asphalt is a composite material consisting of mineral aggregates (stone, sand, and gravel) and a bitumen binder. To combine these, the aggregates must be dried and heated to high temperatures—often exceeding 150°C (300°F)—to ensure the bitumen adheres correctly.

Historically, this heat is generated by burning fossil fuels. According to the National Asphalt Pavement Association (NAPA), greenhouse gas (GHG) emissions in this sector are categorized into different stages, including A2 (transportation of raw materials) and A3 (the actual production of asphalt mixtures at the plant). The A3 stage, which includes the energy used for heating and the electricity for plant operation, is a primary target for decarbonization.

While electrification is a viable solution for many industries, the specific temperature requirements and the scale of asphalt plants make direct electrification challenging. What we have is where hydrogen enters the equation. As a combustible gas, hydrogen can be used in burners to produce the intense heat required for aggregates without releasing carbon dioxide into the atmosphere, provided the hydrogen is “green”—produced via electrolysis powered by renewable energy.

Breaking New Ground: The Veidekke and Benninghoven Partnership

The practical application of this technology has reached a milestone in Norway. The construction company Veidekke, in partnership with technology provider Benninghoven, has implemented the world’s first burner capable of running on 100% green hydrogen. This innovation allows for asphalt production that is virtually free of CO2 emissions from the combustion process.

The impact of this initiative was formally recognized on October 24, 2024, when Veidekke received the Climate Award for its advancements in hydrogen-produced asphalt via Benninghoven. The award, presented by Ole Erik Almlid, CEO of NHO (the Confederation of Norwegian Enterprise), highlighted Veidekke’s role in setting a standard for other companies across all industrial sectors to follow.

The necessity of such innovation is underscored by the difficulty of achieving absolute emission reductions. An audit conducted by PwC focusing on Norway’s largest companies revealed a stark reality: only 18 out of 100 of the country’s largest firms succeeded in reducing their emissions in line with the Paris Agreement via Benninghoven. Veidekke was one of only four companies that managed to reduce both their absolute emissions and their carbon intensity, proving that the adoption of hydrogen technology is a viable path toward legitimate decarbonization.

Key Technical Advantages of Hydrogen Burners

The transition to green hydrogen for asphalt production offers several technical and environmental advantages over traditional methods:

• Zero Carbon Combustion: Unlike natural gas, which releases CO2, the combustion of hydrogen produces only water vapor.
• High Energy Density: Hydrogen provides the intense thermal energy necessary for heating aggregates, ensuring that the quality and durability of the asphalt are not compromised.
• Infrastructure Compatibility: Modern hydrogen burners are designed to be integrated into existing plant architectures, reducing the need for a complete teardown and rebuild of mixing facilities.
• Scalability: As the global supply of green hydrogen increases and costs decrease, these burners can be deployed across existing networks of asphalt plants.

Overcoming the Barriers to Global Adoption

Despite the success in Norway, the global rollout of hydrogen-powered asphalt plants faces significant hurdles. The primary challenge is the “hydrogen paradox”: the technology to use the fuel exists, but the infrastructure to produce and transport it at scale is still in its infancy.

For a plant to be truly “green,” it must have access to green hydrogen—produced by splitting water into hydrogen and oxygen using renewable electricity. If the hydrogen is produced from natural gas (known as “grey hydrogen”), the carbon footprint is simply shifted from the asphalt plant to the hydrogen production facility, defeating the purpose of the transition.

the cost of green hydrogen currently exceeds that of natural gas. However, as governments implement carbon taxes and subsidies for renewable energy, the economic gap is narrowing. The success of the Veidekke project suggests that when the right technology (Benninghoven’s burners) meets a committed corporate strategy and a supportive regulatory environment (Norway’s climate goals), the transition becomes feasible.

Comparative Impact: Traditional vs. Hydrogen Production

What This Means for the Future of Infrastructure

The move toward hydrogen-powered production is part of a broader trend in “green construction.” Beyond the burners, the industry is exploring “warm-mix asphalt” (WMA), which allows for production at lower temperatures, further reducing energy requirements. When combined with green hydrogen, the potential for a near-zero-carbon road is within reach.

For policymakers and urban planners, this shift means that the “embedded carbon” of a highway—the emissions created before the first car even drives on it—can be drastically lowered. This is essential for cities aiming for carbon neutrality, as the construction phase of infrastructure often represents a massive spike in emissions that takes decades of operational efficiency to offset.

From a technological standpoint, the integration of hydrogen into the asphalt industry mirrors the broader industrial transition. Just as the software industry shifted from on-premise servers to the cloud to optimize resources, the construction industry is shifting from localized fossil fuel combustion to a decentralized, renewable energy carrier in the form of hydrogen.

Summary of Key Takeaways

• Technological Breakthrough: The first 100% green hydrogen burner for asphalt production has been successfully deployed, proving that high-heat industrial processes can be decarbonized.
• Proven Results: Veidekke’s adoption of this technology contributed to its 2024 Climate Award and its status as one of the few large Norwegian firms meeting Paris Agreement targets.
• Environmental Impact: Transitioning to green hydrogen eliminates CO2 emissions from the combustion phase (A3) of asphalt production.
• Critical Dependency: The success of this transition depends on the expansion of green hydrogen production infrastructure and the reduction of costs associated with electrolysis.

Next Steps for the Industry

The focus now shifts from proof-of-concept to scalability. The industry is awaiting further data from the Norwegian installations to determine the long-term operational costs and the efficiency of hydrogen burners over multi-year cycles. As more companies adopt these systems, the demand for regional “hydrogen hubs”—centralized production facilities that supply multiple industrial plants—is expected to grow.

The next confirmed milestone for the sector will be the continued auditing of emissions by firms like PwC to verify if the 7% average emission reduction threshold required for climate leadership in Norway can be maintained and exceeded by other firms adopting hydrogen technology.

Do you think hydrogen is the ultimate answer for heavy industry, or should we be focusing more on full electrification? Share your thoughts in the comments below or share this article with your network to join the conversation on sustainable infrastructure.