Due to the benefits to human health from improved air quality, and in the context of international and European regulations for emissions reduction, the maritime shipping sector has been shifting from diesel to Liquified Natural Gas (LNG). Among the available LNG technologies, the sector has shown a preference for the low-pressure dual fuel concept. This technology has many advantages, however, the phenomenon of methane slip (the escape of unburned methane into the atmosphere) combined with the high warming potential of methane gas (28 times that of CO2), is reducing the overall climate benefits of the shift to LNG.

In this context, the GREEN RAY project is assessing and mitigating methane slip in LNG engines to enable clean waterborne transport.


Assessing methane emissions from existing and new LNG vessels

Developing technologies to reduce methane slip in two- and four-stroke LNG engines

Developing an aftertreatment technology to further reduce methane slip

Producing scenarios for shipping emissions & how GREEN RAY can contribute to emissions reduction

Enabling the utilisation of GREEN RAY results to maximise long-term research impacts

Expected Impacts

The GREEN RAY project research results and developed technologies will contribute to many EU goals, with impacts for environment (), economy (), and society ():

Supporting the uptake of climate-neutral fuels and the decarbonisation of the shipping sector

Increasing energy efficiency and lowering fuel consumption of maritime vessels

Enabling clean, climate-neutral, and climate-resilient inland waterway vessels before 2030

Eliminating harmful pollution to air and water from increasing utilisation of LNG fuel

Creating competitive European waterborne industries

Facilitating the integration of innovative port infrastructure necessary to incorporate alternative fuels and electrification

Achieving the smart, efficient, secure, and safe integration of maritime and inland shipping into logistics chains

Enabling fully automated maritime and inland shipping and efficient connectivity

How will we achieve this?

GREEN RAY will assess and mitigate methane slip through the development of three technologies for low-pressure dual fuel engines in existing vessels and new builds.

GREEN RAY is targeting a technology readiness level (TRL) of 7 – system protype demonstration in operational environment – and we will demonstrate the three technologies on new vessels as well as retrofitting the technology on an existing vessel.

The consortium

The GREEN RAY Consortium includes partners from across the shipping value chain, as well as experts in maritime transport research and communications.

For more details about partners, funding, and budget, please visit CORDIS.

GREEN RAY Work Package Distribution

  • WP1: Methane emissions from shipping
  • WP2: On-engine technologies development (two-stroke and four-stroke dual fuel engines)
  • WP3: Aftertreatment technologies development
  • WP4: Onboard demonstration
  • WP5: Dissemination and Exploitation
  • WP6: Project management

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