Superyacht Eco Association

SEA Index ®

The Superyacht Eco Association (SEA) Index is a non-profit initiative historically founded by the Yacht Club de Monaco and Credit Suisse.

The SEA Index CO2 tool has helped an increasing number of superyacht owners to impartially assess the environmental impact of their yachts. The tool was developed in response to strong demand from forward-thinking superyacht owners, as well as with key industry players such as captains, shipyards, operators and an independent certification company. Through increased transparency, we aim to empower yacht owners with proactive measures to make informed decisions when buying, selling or chartering a vessel.

The SEA Index® CO2 certification application process is available to any yacht owner of vessels over 25m. Join us in a new era of responsible yachting.

“The next decade will be a decisive one for the future of our planet. Climate change is one of our biggest challenges.”

HSH Prince Albert II


Motor yachts (25m+) in the world


Sailing yachts (25m+) in the world


New motor yachts (25m+) delivered in 2023


New sailing yachts (25m+) delivered in 2023

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Our Vision

Our vision is that the SEA Index tool will become the superyacht energy-intensity standard.
By providing transparency, the SEA Index allows stakeholders to easily assess and compare a yacht’s carbon impact.

In turn, this will enable the industry to generate new products based on their carbon rating and create incentives for builders and owners to design yachts with lower fuel consumption and less environmental impact.

Our Mission

Our mission is to suppport superyacht owners towards less energy-intensive yachting, to be an aggregator of tangible solutions, bringing together shipyards, innovators and operators. We aim to support key industry players towards change, defining objectives to reduce emissions. The SEA Index is a voluntary tool and the Superyacht Eco Association aims to create a true ecosystem of stakeholders, providing impartial information and helping to implement new solutions.

The long-term goal of the SEA Index is to become the world’s leading energy- intensity rating system for superyachts, with a view to be extended to other sectors, leading to a multifaceted sustainability index.