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Apollo · Project

Retrofitting Offshore Vessels to Run on Low-Emission Ammonia Fuel

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Imagine taking an old ship and swapping its traditional engine for one that runs on ammonia, similar to how some modern buses use hydrogen. This project creates a kit to upgrade existing ships so they don't need to be built from scratch to be green. It's like giving an old car a high-tech electric conversion, but for massive ocean-going vessels.

By the numbers
70%
Reduction in GHG emissions
2.4 g/kWh
NOx emissions limit
130%
Maximum operational expenditure vs baseline
The business problem

What needed solving

Existing offshore vessels are expensive to replace but fail to meet tightening GHG and NOx emission regulations. Ship owners need a way to convert current fleets to carbon-free fuels without rebuilding entire ships.

The solution

What was built

A dual-fuel ammonia engine system and a complete retrofit package including storage tanks, bunker lines, and safety systems for existing vessels.

Audience

Who needs this

Offshore supply vessel ownersDredging company fleet managersMaritime insurance companiesShip classification agenciesGreen ammonia producers
Business applications

Who can put this to work

Offshore Energy
enterprise
Target: Offshore supply vessel operators

If you are a vessel operator dealing with strict carbon limits — this project developed a dual-fuel engine retrofit that reduces GHG emissions by 70% or more. This allows you to keep using existing ships while meeting IMO Tier III emission levels.

Maritime Construction
mid-size
Target: Dredging and construction ship owners

If you are a dredging company dealing with high operational pollution — this project developed a scalable retrofit solution for different vessel types. It enables a transition to green ammonia with a target operational expenditure under 130% of the current baseline.

Shipbuilding
any
Target: Shipyards specializing in retrofits

If you are a shipyard dealing with a lack of standardized green conversion blueprints — this project developed a complete technical package including storage tanks and safety systems. This allows you to offer ammonia-fuelled vessel class conversions as early as 2025.

Frequently asked

Quick answers

What is the expected cost impact on operations?

The project aims for a validated business case where operational expenditures are less than 130% compared to the baseline by the end of the project.

Can this be scaled to other types of ships?

Yes, the project plans to demonstrate the retrofit in two additional vessels used for dredging and offshore construction to validate scaling feasibility.

Who owns the IP or licensing for the engine conversion?

Based on available project data, specific IP or licensing terms are not mentioned, but the solution is designed for adoption by ship owners and designers by 2025.

Does the solution meet international maritime laws?

Yes, the engines are designed to comply with GHG, SOx, and NOx emissions according to IMO Tier III levels and seek DNV 'Gas fuelled, Ammonia' classification.

When will the solution be ready for commercial decision-making?

The project intends to adapt the design so that ship owners and insurance companies can adopt the solution into their decision-making processes as early as 2025.

Consortium

Who built it

The consortium is heavily industry-driven, with 9 industrial partners (75% of the group) and 2 research entities. This high industry ratio, combined with partners from 6 countries (BE, BG, EL, FI, NO, SE), indicates a strong focus on commercial viability and practical shipyard implementation rather than theoretical research.

How to reach the team

Contact MARITIME CLEANTECH in Norway

Next steps

Talk to the team behind this work.

Contact us to connect with the Apollo consortium for retrofit licensing.

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