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GREEN AMMONIA is essential in the journey towards a cleaner future. Ammonia is a key component of fertilizer production around the world. Ammonia can also replace a significant part of fossil fuels currently used in global maritime transport.

The challenge of today’s ammonia production process is that it’s based on fossil energy sources. If we can replace these energy sources with clean sources, we will have progressed considerably towards a cleaner world.

This is the objective of Hegra, a joint effort between Yara, Aker Clean Hydrogen and Statkraft aimed at producing green ammonia at Herøya in Porsgrunn, Norway.


HEGRA is the single largest climate initiative in Norwegian industrial history

A green transition for greater value creation

Watch the launch of Hegra at Herøya and a panel discussion about green value creation, hydrogen and the role of green ammonia!



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Achieving the objectives in the Paris agreement will require new, clean energy fuel sources. While batteries are a good solution, for example for private cars and ferries for short distances, they don´t work as an energy carrier on a large scale or over long distances, for example in the shipping industry. This requires new solutions like hydrogen and ammonia.

Ammonia can be used for many of the same purposes as hydrogen and offers the advantage of being entirely carbon-free when burned. Another advantage is that ammonia is easier and cheaper to handle. Additionally, there is already a worldwide infrastructure for shipping and handling of ammonia. Consequently, this solution will be available more quickly than hydrogen – and time is of the essence if we are to achieve the climate objectives.

Why green ammonia?

800 000

A transition will cut CO2 emissions by

tons per year and provide climate-neutral fuel for shipping and green fertilizer for agriculture.

* This corresponds to the annual emissions of around 300,000 fossil fuel-powered passenger cars.

Hydrogen and nitrogen from the air are processed into ammonia on Herøya.

But the hydrogen produced today is based on fossil sources. Replacing this part of the process with water electrolysis driven by clean electricity from water, wind or solar power will make the ammonia green. In order to accomplish this in an economically sound way, we need to develop projects on a large scale and achieve technological improvements that reduce costs. In the past, we´ve already accomplished this with solar and wind energy.

This will require collaboration with other parties and authorities to create a green value chain – and has large potential to make Norwegian off-shore shipping emissions-free. We can also produce green fertilizer in the process, an important piece of the puzzle in reducing the carbon footprint of farming.

The recipe for
green ammonia is simple

"This is not only a unique climate initiative, but a strategic commitment to establishing a new value chain for green hydrogen and green ammonia in Norway, which in turn can create and safeguard jobs for the future."

Auke Lont, Chairman of HEGRA

Green ammonia for agriculture

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Ammonia is a basic building block for nitrogen fertilizers.

On completion of the electrolysis plant, everything will be in place for the production of green nitrogen fertilizer at Yara’s factories on Herøya, which are fully integrated with the ammonia plant.

This will result in the world’s first production of low carbon fertilizer on a large scale, thereby helping to reduce the climate footprint of Norwegian and global agriculture. Reducing the climate footprint of agriculture is essential to ensuring sustainable food production in the future.

For over 120 years Yara has been developing agricultural solutions around the globe and the partnership on Herøya will be a cornerstone in the development of eco-friendly farming practices.

The potential for cleaner fuel in shipping is enormous, both nationally and internationally. Shipping accounts for 2% of global CO2 emissions, with long-distance maritime shipping representing around 80%.

If the fuel currently used for all long-distance shipping is converted into ammonia, this would correspond to around 500-600 million tons of ammonia each year – three to four times the current global ammonia production amount.

The Norwegian shipping industry has set itself the objective to cut emissions from inland shipping by 50% by 2030. To make this happen, there´s a need for green hydrogen production.

Green ammonia is of immeasurable worth for shipping

The Herøya peninsula in the municipality of Porsgrunn in southern Norway is home to Norway´s only ammonia plant. The total production capacity of the plant is around 500,000 tons of ammonia. Installing an electrolysis capacity of ~450 MW will enable the plant to produce around 400,000 tons of green ammonia each year, which corresponds to the historic production level of the factory.

Herøya is well adapted for large-scale production and export, thereby enabling Norway to quickly participate in the hydrogen economy. Building a new ammonia plant, and corresponding infrastructure. is very capital intensive. By using Yara’s existing ammonia plant and infrastructure on Herøya, the total capital needed for the project can be reduced considerably compared to an alternative location with a newly built plant.

Why is Herøya the most relevant location for Norway’s next industrial adventure?

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Photo: Frode Heiland

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Hegra has already been covered widely in the media. .

See some of the media coverage here.

About green ammonia production in the media