Green Ammonia: How It’s Made, What It Costs, and How to Verify Carbon Intensity

What Is Green Ammonia

Green ammonia is a molecule made of green hydrogen and nitrogen.

Conventional ammonia production relies on fossil-derived hydrogen, typically produced through steam methane reforming of natural gas. Green ammonia replaces said hydrogen with green hydrogen, which is produced through water electrolysis powered by renewable energy sources.

The conventional and green ammonia molecules themselves are identical. What changes is the production pathway. Different production pathways lead to different carbon footprints.

Put simply, "green" refers to how the hydrogen is produced, not to a different form of ammonia. As such, the story of green ammonia is really a story of carbon intensity. Markets value the molecule based on how much carbon was emitted during its creation.

Globally, ammonia production stands at around 230 million tonnes per year. Around 70% is produced via steam methane reforming of natural gas, with a further ~20% via coal partial oxidation. Only around 10% currently uses electrolysis-based production. 

That means the bulk of the market is still highly carbon-intensive, and the transition to low-carbon production, while underway, faces real barriers: high capital costs, infrastructure gaps, and uncertainty about how to monetise lower-carbon output.

Why Ammonia Matters in the Energy Transition

Ammonia's importance extends beyond its historical role in nitrogen-based fertilizers.

Ammonia is also a key feedstock across the chemical industry, and it's gaining popularity as both a shipping fuel and a practical way to transport and store hydrogen at scale.

• Fertilizer and Chemicals: Agriculture is the largest consumer of ammonia, but the push to reduce greenhouse gas emissions in food supply chains is forcing a shift to low-carbon inputs.
• Shipping Fuel and Marine Decarbonization: The maritime sector views green ammonia fuel as a solution for deep-sea shipping. Regulations like FuelEU Maritime and the IMO’s revised strategies are pushing shipowners toward zero-carbon alternatives.
• Hydrogen Transport and Storage: Hydrogen is notoriously difficult to transport in its pure form. Converting it to liquid hydrogen is energy-intensive and expensive. Ammonia is much easier to store and transport, acting as an efficient hydrogen carrier.
• Industrial Heat and Power: Some see ammonia combustion in gas turbines, or using the compound as a co-firing fuel in coal power plants, as a way to lower carbon emissions.

Commercially, ammonia matters because it sits at the convergence of traditional commodities, future fuels, and carbon markets. It is a globally traded energy commodity that investors, buyers, and policy teams view through the lens of climate risk and opportunity.

How Green Ammonia Is Produced

The production of green ammonia is a complicated, three-step process:

Green hydrogen production

First, the ammonia facility produces hydrogen via electrolysis. Inside an electrolyzer, an electric current splits water molecules into hydrogen and oxygen. If the electricity comes from a renewable energy source like solar or wind, the resulting hydrogen is "green". As such, this step changes the entire emissions profile of the ammonia that follows, and eliminates the need for natural gas and the associated carbon emissions of traditional steam methane reforming.

The type of electrolyser matters too. Different electrolysis technologies - PEM, alkaline (ALK), and solid oxide (SOEC) - have different energy consumption rates, which directly affects the carbon intensity of the hydrogen and, in turn, the ammonia produced.

Nitrogen separation

Ammonia also requires nitrogen, which is extracted from the atmosphere with an air separation unit. While this part of the production process is less energy-intensive than hydrogen production, the energy used still contributes to the overall carbon intensity of the final product.

Haber-Bosch ammonia synthesis

Finally, the green hydrogen and nitrogen enter the Haber-Bosch process. In this step, the gases are combined under high pressure and heat in the presence of a metal catalyst to form ammonia. It's the same process that's been used to produce ammonia for over a century. What's changed is the energy input and the hydrogen source. By using renewable inputs, the green ammonia production process reduces the carbon footprint of the final chemical.

In Sylvera's carbon intensity framework for ammonia, the CI score for electrolysis-based production is calculated by multiplying the energy consumption rate (MWh/tNH₃) by the energy emission factor (tCO₂e/MWh), based on the specific electricity source — whether dedicated renewables, grid, or a Power Purchase Agreement. This means two facilities both labelled "green" can have materially different CI scores depending on their electrolyser type and power source.

Green Ammonia vs Grey and Blue Ammonia

The market categorizes ammonia by color. These labels represent different levels of carbon performance. They do not refer to the physical appearance of the chemicals.

• Grey Ammonia: As the standard form of the chemical, grey hydrogen is derived from fossil fuels without carbon capture. It is the most carbon intensive version of the product.
• Blue Ammonia: This form of the chemical is produced using fossil-derived hydrogen, but manufacturers use carbon capture and storage (CCS) to mitigate emissions.
• Green Ammonia: This form of the chemical is made with renewable hydrogen. Because of this, green ammonia offers the lowest potential emissions profile.

"Potential" is the key word, as the "green" label can be misleading. The actual carbon intensity of green ammonia can vary based on several factors, including the power source, capture rate, boundary assumptions, and the production plant's efficiency.

Sylvera's framework moves away from these categorical labels entirely, assigning a continuous carbon intensity value — expressed in tCO₂e per tonne of NH₃ — to each facility. This allows like-for-like comparison across production methods and geographies, revealing the true spread in emissions performance that colour categories conceal.

What Green Ammonia Is Used For

The green ammonia market is split in two. On one side, there are established industrial uses. On the other side, emerging, high-growth applications. Let's take a closer look at each:

Established Industrial Uses

The chemical industry uses ammonia to create nitrogen-based fertilizers. It also uses the compound as an industrial chemical feedstock for products like nitric acid.

Major buyers include agricultural fertiliser producers like Yara International, IFFCO, Coromandel International, Paradeep Phosphates, and Madhya Bharat Agro Products; chemical companies like BASF and Air Products; and energy and utilities companies like Uniper, E.ON, RWE, and JERA Co. Commodity traders such as Trammo, Marubeni, and Mitsui are also active buyers.

The Sylvera platform can show top historical buyers of ammonia with the Commodity Insights tool, helping ammonia producers connect with potential customers in less time.

Emerging, High-Growth Applications

Green ammonia fuel is gaining popularity in the shipping industry. Regulations such as the EU's Carbon Border Adjustment Mechanism (CBAM) and FuelEU Maritime have created a clear economic incentive for low-carbon fuels. Beyond shipping, ammonia is gaining traction as a hydrogen carrier for international trade and as a medium for long-duration energy storage.

What Green Ammonia Costs Today

Green ammonia prices are higher than conventional ammonia prices. The gap is driven by renewable electricity costs, electrolyser capital expenditures and efficiency, ammonia synthesis plant capex, utilization rates, and the current storage and transport infrastructure.

While all this is true, "How expensive is green ammonia?" is the wrong question. Instead, ask "What conditions make green ammonia competitive in the current market?"

The answer to the second question varies by region. The Middle East and Australia lead green ammonia production because their solar and wind economics are exceptionally strong. Lower renewable electricity costs translate into lower green ammonia prices, which is why geography plays a large role in where viable green ammonia projects are developed.

It's worth mentioning: Premium pricing in the green ammonia market depends on the credibility of carbon intensity data. Buyers won't pay green premiums without verification.

Why Carbon Intensity Matters More Than the Color Label

Buyers have realized that a "green" label is not a guarantee of performance.

Many facilities produce green ammonia, but some have much larger carbon footprints. The difference comes down to electricity sourcing, system boundaries, and verification approaches.

Sylvera's data illustrates this clearly: the spread in carbon intensity across ammonia facilities can be significant, from as low as 0.25 kgCO₂e/kg ammonia to as high as 5.5 kgCO₂e/kg ammonia. That is not a marginal difference. It is the difference between a genuinely low-carbon product and one that barely improves on grey ammonia in some cases. Colour labels obscure this entirely.

In real markets, buyers care about measured carbon intensity, not just claimed pathways. This shift will continue to grow, as it's driven by rigorous standards:

• RFNBO Standards: Require hydrogen-derived fuels to meet strict additionality and temporal matching criteria.
• CBAM: Requires facility-specific emissions data, making generic "green" claims insufficient for regulatory compliance.
• Offtake Agreements: Modern contracts increasingly include carbon intensity thresholds that producers must verify to unlock price premiums.

How to Verify Carbon Intensity Credibly

Credible verification is the only way to turn a "green" claim into a valuable, tradable asset. Organizations must measure several data points to make this happen:

• The electricity source and matching approach
• The real-world efficiency of the electrolyzers used
• The exact energy demands for nitrogen separation
• The exact energy inputs for ammonia synthesis
• All upstream and transport emissions
• All allocation and system boundary assumptions

Common verification pitfalls include making renewable claims without robust sourcing evidence, using inconsistent lifecycle boundaries, applying average grid intensity to something marketed as green, relying on self-reported data without third-party verification, and substituting generic emission factors for facility-specific measurements.

Buyers need standardized carbon intensity assessments to compare suppliers. Without that, procurement decisions rely on claims, not evidence. In these scenarios, the green premiums that producers need to make their economics work are hard to justify.

How Green Ammonia Fits into Carbon-Differentiated Commodity Markets

Green ammonia is part of a broad shift across commodity markets. Steel, cement, hydrogen, and shipping fuels are going through a similar transition in which buyers and regulators now differentiate products by embedded carbon intensity, not only by commodity grade.

This creates new value for producers who can prove lower emissions, and new risk for buyers who can't distinguish credible low-carbon supply from marketing claims. After all, carbon credits and low-carbon commodities aren't separate strategies anymore. They're part of the same commercial and compliance picture, and smart buyers treat them as such.

For green ammonia, value will come from the producer's ability to prove lower embedded emissions at the facility level, not from claiming a green production pathway.

Where Sylvera Stands

Buyers struggle to compare green ammonia suppliers, while investors lack the data they need to assess ammonia production facilities. Sylvera solves these problems via independent verification, which enables producers to demonstrate their competitive advantage to the marketplace.

Commodity Insights

Sylvera's Commodity Insights helps companies understand supply and demand dynamics in emerging commodity markets, including green ammonia, with data on announced projects, production capacity, and offtake agreements. This supports more credible supplier comparison and better procurement decisions as expansion of carbon-differentiated trade grows.

Carbon Intensity Assessments

Sylvera also offers Carbon Intensity Assessments at the facility level for hydrogen, ammonia, cement, and beyond. This solution gives buyers, producers, and investors the standardized, independent data they need to streamline decision-making and act with confidence.

Carbon Market Context

As carbon markets continue to evolve, green ammonia sits at the center of the convergence between commodity pricing, compliance requirements, and carbon intensity. Sylvera's broader market context helps market participants understand how these forces reshape the landscape.

The future isn't “credits versus commodities,” but a convergence of both. Green ammonia is an example of how carbon intensity, compliance, and commodity pricing are linked. Request a free demo of Sylvera today to see how our platform can keep you at the forefront of the market.

What Comes Next for Green Ammonia

The long-term potential for green ammonia is strong, but growth depends on a few necessary developments, such as the continued scale-up of electrolyser capacity, expanded renewable power availability, investment in ammonia bunkering and shipping infrastructure, stronger carbon accounting requirements, and sustained policy support in Asia and Europe.

The economics are improving, the regulatory pressure is building, and the demand signals are real. But the market's ability to fulfill its promise will depend on whether carbon intensity claims can be verified at scale. That's the piece that ties everything together.

Fight Climate Change With Green Ammonia

Green ammonia is an important low-carbon commodity. It has the potential to reshape fertilizer production, shipping fuels, and hydrogen trade. But this is only true if markets can distinguish credible low-carbon supply from broad marketing claims. Sylvera can help.

Our platform enables buyers to understand carbon-differentiated commodity markets, compare carbon intensity across suppliers, and make better procurement decisions. Request a demo.