Grieg star lygra

Star Lygra. Foto: Grieg Star.

Green Ammonia Powered Bulk Carrier

Ammonia has been highlighted as one of the more promising future fuels in order to achieve reduced CO2 emissions from shipping. A considerable amount of knowledge about the coastal use of ammonia for short distances is gradually coming into place, and today ammonia together with methanol is considered to be the solution that is closest to large-scale implementation. 

The industry has also gained experience with the transportation of ammonia, but there are still several uncertainties related to how well it will work as a fuel for long-distance transportation. 

For Greig Maritime Group, which participates in several initiatives in both production and distribution of green ammonia, it is only natural to also study the possibility of ammonia in deep-sea shipping. 

This project will investigate whether green ammonia can technically function as fuel at long sea distances and whether it is economically feasible. Safety and regulatory barriers will be identified, as well as any need for operational changes. A final, significant challenge that will be studied is the availability of ammonia in relevant ports. 

Partners will work with five different workflows: “Green Ammonia Availability”, “Safety, Rules and Regulations”, “Vessel Retrofit to Ammonia”, “ESG and Finance” and “Operations”. 

Among the partners, we find players from the entire value chain, from cargo owners, technology companies, insurance companies, service providers, authorities, and the world´s largest Open Hatch shipping company. See the complete list to the right. 

Other contributors to the pilot project are Chevron, DSB (The Norwegian Directorate for Civil Protection), G2 Ocean, MAN, Suzano and Zero Emission Shipping Mission. 


Grieg open hatch




Unlike most ammonia-related projects that focus on using new construction of vessels, this pilot aims to use one of Greig´s eight-year-old L-Class Open Hatch Bulk ships. A possible trade route has been defined between Europe, the Gulf of Mexico, and Brazil, where our partner Suzano sends large quantities of production of paper.


Grieg piloten potential ports






As this pilot is a feasibility study, no final decision on remodeling will be made as a part of this project. The product will be a final report in which the overall goal is to provide the best possible basis for decision-making against redevelopment in a possible later phase. Regardless of the conclusion, the final report and the most important findings will be shared with the rest of the industry. 

There is a strong belief that ammonia will play a part in the future of greens shipping and lays the lay as a foundation for the pilot´s goals. The relatively lower energy of alternative fuels, compared with more conventional fossil fuels, are among the challenges that differ between short sea shipping and deep-sea intercontinental shipping. 

Grieg has a defined ship, a specific route for established transport, owner and operator of goods, and the entire value chain is involved. The two questions that need to be addressed are: 

  • Is it possible and reasonable, both technically and financially, to reconstruct an 8-yeard old ship to be operated with ammonia in order to be utilized for shipping goods across the Atlantic ocean?
  • What are the most important barriers, risks, and opportunities that might arise?

The goal of the pilot 

  • The ultimate goal with the pilot would be to realize the world´s first deep-sea “open hatch” bulk carrier that is powered by green ammonia – retrofitting. 
  • Initially, the pilot study will be conducted under GSP in order to evaluate the feasibility of the pilot. 


The pilot was initiated in January 2022. A kick-off meeting was held, where five defined work streams were presented and approved. Multiple participants reported interest to contribute to one or more workstreams, and four companies assumed the responsibility of leading the work flows;

  1. Yara (Green Ammonia Availability),
  2. Norwegian Maritime Authority (Safety, Rules & Regulations),
  3. Grieg Maritime Group (Vessel Retrofit to Ammonia, ESG, and Finance), and
  4. G2 Ocean (Operations). 

In mid-February 2022, a meeting, which marked the end of the start-up phase was held with all pilot participants. Each work stream had defined its approach to the challenges they face and was ready to get started. 

Status March 2022: The pilot project plan to continue to end of 2022 with the five different focus areas: Green Ammonia Availability, Safety, Rules and Regulations, Vessel Retrofit to Ammonia, ESG and Finance, and Operations.

Status September 2022: NIS’ requirements for the use of ammonia as fuel are under development and “close to completion”. Procedures for handling of ammonia and training of crew are also under development. Integration of tank systems on existing ships are recognized to be challenging.

The execution capability is perhaps the least challenging part of this pilot since no operational showstoppers have been identified.

There is a big difference in how forward-leaning the ports are. The ports of Brazil seem to be the most proactive with regards to the interest in ammonia.

Initially, this trade can manage with bunkering in one port.

The biggest costs, according to the current pilot findings, are related to the retrofit phase – how can these investments be justified?

The pilot has a clear communication plan that has already been implemented. This has led to a lot of attention in various national and international media with about 7 million readers.

For more information: see E24 article: “Grieg vil ha ammoniakk på noen av sine største skip – E24″ and/or a presentation in Teknisk Ukeblad: “Vil bygge om 50.000 tonner til ammoniakkdrift og nullutslipp” –

Sign up for our monthly newsletter

Follow us on Twitter or leave your email address and we will keep you updated (in Norwegian)

  • This field is for validation purposes and should be left unchanged.