The cement industry is the backbone of modern infrastructure, yet it is also responsible for roughly seven per cent of global CO₂ emissions. Most of that footprint comes from producing clinker, the glue of cement. Clinker formation demands temperatures up to 1450 °C, traditionally achieved by burning coal, petcoke or gas.
Reducing fuel-related emissions is crucial if the sector is to align with a net-zero world. Enter green hydrogen – a clean, high-temperature fuel that, if generated with renewable electricity, emits only water at the point of use.
Over the past five years, hydrogen has moved from laboratory curiosity to full-scale kiln trials, and a first wave of commercial deployments is now underway. This article examines the extent to which technology has advanced, identifies the companies leading the charge, and outlines the hurdles that remain.
Why Hydrogen – and Why Now?
Hydrogen offers three key advantages for cement producers.
First, it can achieve the extreme flame temperatures that clinker chemistry demands.
Second, its combustion is carbon-free, so every unit of fossil fuel replaced brings a direct reduction in scope one emissions.
Third, hydrogen flames have a high propagation speed that can stabilise combustion and enable higher use of difficult alternative fuels such as biomass or refuse-derived fuel.
All of these benefits have been demonstrated in recent plant trials, showing that hydrogen can complement – not merely substitute – other decarbonisation levers such as clinker substitution and carbon capture.
Hydrogen’s appeal has been amplified by falling renewable-power costs, new subsidies under the EU Innovation Fund and the US Inflation Reduction Act, and a flurry of national hydrogen strategies. Even so, cost and supply constraints remain formidable. A single mid-sized cement plant can consume several tonnes of fuel per hour. Sourcing that as green hydrogen demands vast electrolyser capacity, along with low-cost clean electricity and specialised storage and delivery infrastructure.
From Experiment to Industrial Reality
United Kingdom: A World-First Net-Zero Fuel Mix
The pivotal moment for the industry arrived in September 2021, when Hanson UK (part of Heidelberg Materials) and the Mineral Products Association fired the 5000 t day⁻¹ kiln at Ribblesdale entirely on a mix of green hydrogen and biogenic fuels, eliminating fossil inputs for the first time at full industrial scale [1].
Over several days, the operators ramped up hydrogen injection at the main burner and the precalciner, ultimately producing 200 t of saleable clinker with no loss in cement quality [2].
The demonstration proved that hydrogen can be dropped into an ordinary rotary kiln using retrofitted burners and that the process chemistry remains intact.
CEMEX: From Spanish Pilot to Continental Roll-Out
CEMEX was the first major producer to commit to hydrogen beyond pilot scale. After positive trials at its Alicante plant in 2019, the company installed hydrogen injection systems across every one of its European kilns by early 2021 [3].
Hydrogen is fed through lances as a “combustion catalyst”, allowing operators to raise alternative fuel substitution rates while keeping flame stability. CEMEX reports that the technology increases the share of waste-derived fuels by eight to ten percentage points and has already cut thousands of tonnes of CO₂ each year [4].
The model was so convincing that four Mexican plants adopted hydrogen in 2022, followed by a Caribbean installation at San Pedro de Macorís.
Limak Cement and Air Liquide: A Turkish First in the Calciner
Most trials focus on the main burner, but Limak Cement broke new ground in 2024 by injecting a 50 per cent hydrogen-rich mix into the calciner at its Ankara plant [5].
The calciner operates at lower temperatures than the kiln but accounts for a large share of fuel demand in modern preheater lines. Limak proved that hydrogen can work in this stage too, opening an additional front for emission cuts. Limak now aims to run all its plants on hydrogen-enhanced fuel by 2030, potentially saving 700,000 t CO₂ per year [6].
Cementos Argos: Proving the Business Case in Latin America
Hydrogen need not be confined to Europe. Cementos Argos injected hydrogen into the main burner at its Piedras Azules plant in Honduras during 2022. The result was a three per cent rise in clinker throughput and a two per cent drop in specific fuel consumption, together delivering a 204 per cent internal rate of return on the pilot investment [7].
These gains show that small hydrogen volumes can pay for themselves through efficiency improvements and greater use of cheap alternative fuels.
Brazil’s First Green Hydrogen Pilot
Further south, Mizu Cimentos and utility CPFL Energia are building Brazil’s first electrolyser-powered hydrogen pilot at Baraúna, due online in 2027. The initial six-month test will cut a modest 12.5 t CO₂ but is designed to gather data for large-scale deployment across CPFL’s renewable portfolio [8].
Such partnerships between energy suppliers and cement makers may prove vital in regions without an existing hydrogen network.
Technical Feasibility: Lessons Learned
Combustion behaviour. Operators report that even a five per cent hydrogen share can intensify the flame and promote more complete combustion of low-calorific alternative fuels. Flame imaging at Ribblesdale showed a stable, slightly shorter, hotter plume that improved heat transfer to the clinker bed [2].
However, hydrogen’s higher adiabatic flame temperature can raise thermal NOₓ emissions if burner design and staging are not optimised.
Material integrity. Concerns that hydrogen could damage refractory linings or alter clinker chemistry have not materialised. Post-trial microscopy at Ribblesdale and Alicante confirmed mineralogy within normal ranges. Compressive strength tests on cement mortars met all European standards [2][3].
Equipment modifications. Most trials used existing burners retrofitted with hydrogen lances. Nonetheless, scaling above 20 per cent hydrogen will require purpose-built burners, hydrogen-rated valves and robust leak detection.
Safety and handling. Plants have installed continuous monitoring, positive-pressure ventilated gas rooms and automatic isolation valves. Training staff to manage these systems is a non-trivial undertaking, but one that operators say is manageable.
Energy demand and economics. A US techno-economic study found that blending five to twenty per cent green hydrogen could raise cement cost by 0.6 to 16 per cent while shaving only 0.4 to six per cent off CO₂ emissions, implying abatement costs of USD 200–350 t⁻¹ CO₂ [9].
These numbers will improve as electrolyser and renewable-power costs fall, yet they underline why early adopters tend to start with small hydrogen volumes and co-fire with biomass.
Policy and Standards Landscape
A patchwork of policies is pushing hydrogen forward. The EU Emissions Trading System prices each tonne of CO₂ at around EUR 85, tilting the financial calculus. The UK is finalising its Low Carbon Hydrogen Certification Scheme, which will allow hydrogen-fuelled clinker to claim lower embodied-carbon scores in public tenders.
Meanwhile, the Global Cement and Concrete Association has launched a Net-Zero Roadmap whose 2030 targets implicitly rely on low-carbon fuels accounting for at least 30 per cent of thermal energy. Hydrogen is expected to supply a non-trivial share of that demand.
Standards bodies are keeping pace. European Committee for Standardisation (CEN) tests have confirmed that hydrogen-fired clinker meets EN 197 performance parameters. Similar updates are underway at ASTM in the United States and national standards bodies in Japan and Australia.
Looking Beyond 2030
For now, hydrogen will mainly play a supporting role – a few percentage points of the kiln’s energy mix in plants that also burn biomass and industrial waste.
Over the next decade, three trends could push that share higher:
Gigawatt-scale electrolysers adjacent to cement clusters. Germany’s planned 5 GW “Norddeutsches Reallabor” and the UK’s Bay Hydrogen Hub are both exploring bulk supply to heavy industry, including cement.
Hybrid electrification. Direct-electrically heated calciners could pair with hydrogen-fuelled main burners, cutting fossil demand at both stages.
New cement chemistries. Alternative binders such as limestone calcined clay cement (LC3) require less energy and lower peak temperatures, making them easier to heat with hydrogen or electricity.
Even under optimistic cost trajectories, complete substitution of fossil fuels would still leave the process emissions from limestone decomposition untouched. Hydrogen therefore sits alongside – not instead of – clinker substitution and carbon capture utilisation and storage (CCUS).
The most credible net-zero pathways combine all three, with hydrogen tackling part of the fuel emissions, while CCUS mops up process emissions.
Conclusion
Green hydrogen is no longer a theoretical option for the cement sector. From Lancashire to Ankara and from Alicante to Honduras, real kilns have proved that hydrogen can burn hot, clean and economically – at least in modest doses.
CEMEX is using it every day across Europe; Heidelberg Materials has shown it can power a kiln on a wholly net-zero fuel mix; Limak is pioneering hydrogen in the calciner; and Mizu is building Brazil’s first green hydrogen pilot.
Challenges persist – notably cost, supply chains and burner redesign – yet the momentum is unmistakable. As electrolyser costs slide and carbon prices bite, hydrogen is set to become a vital arrow in the cement industry’s decarbonisation quiver.
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