Superyacht Eco Association launches Phase III SEA Index®

Monaco, JULY 31st, 2023

The Superyacht Eco Association (SEA Index) is proud to announce the launch of SEA Index Phase III, a pioneering initiative to measure the carbon intensity of superyachts. Building on the success of the previous phases, this new segment expands the scope of the SEA Index calculation tool to include yachts below 400GT and above 25 meters in length.

Phase III marks a significant milestone, as it extends the range of yachts already covered by the calculation tool (40m+). Now, a broader spectrum of vessels, including those starting from 25 meters in length, can benefit from this comprehensive non-biased energy-intensity rating tool.

The SEA Index is a forward-looking tool that remains adaptable to future developments in the industry. It is based on the IMO EEDI/ EEXI index, allowing it to incorporate new technology like Hydrogen Fuel Cells or fuels like Methanol, which may be integrated into yachts in the future.

Since its inception in 2020, the SEA Index has aimed to provide yacht owners with proactive measures to make informed decisions when buying or chartering a vessel. The SEA Index’s mission is to promote transparency within the sector and support a more sustainable yachting future.

Malcolm Jacotine Superyacht2030 comments: “The Sea Index is a tool which, crucially, is in alignment with the IMO, that can help owners and charterers make more informed decisions about the energy efficiency, fuel consumption and emissions of comparable yachts. Rating the energy efficiency is one way the industry can demonstrate a more responsible approach to the climate crisis. It is applicable to new-builds and the legacy fleet -I believe every superyacht should have a Sea Index rating.”

SEA Index Phase III was developed in collaboration with Lloyd’s Register, a respected maritime classification society. Their expert international teams ensured continuous validation throughout the process, paving the way for the successful implementation of this new phase.

By utilising the SEA Index, superyacht owners can access independent CO2 certification issued by Lloyd’s Register on behalf of the SEA Index, helping them stay ahead of the fleet and make more environmentally responsible choices.

The SEA Index invites all stakeholders, including yacht owners, manufacturers, and industry professionals, to take advantage of this essential tool and join the journey towards a sustainable yachting industry.

For more information about the SEA Index Phase III and its energy-intensity rating tool, please visit

About Superyacht Eco Association (SEA Index):

The Superyacht Eco Association (SEA Index) is a non-profit organisation dedicated to promoting environmental sustainability within the superyacht industry. Led by the Yacht Club de Monaco and Credit Suisse, SEA Index strives to provide innovative solutions and tools that empower yacht owners and stakeholders to reduce their carbon footprint and contribute to a cleaner marine environment.

SEA Index Range Distribution Image Update Phase II & III
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