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eSAIL®

A suction sail for merchant ships using WAP, reducing fuel costs, emissions, and maintenance

July 2018
April 2025

eSAIL®

A suction sail for merchant ships using WAP, reducing fuel costs, emissions, and maintenance

  • World Alliance Member
  • Featured Solution
  • Labelled Solution
Label Date April 24, 2025
From Spain
Maturity stage TRL 9 / CRI 3-4 - Commercial Scale Up / Multiple commercial Applications

eSAIL® is an innovative Wind-Assisted Propulsion System (WAPS) that uses active boundary layer control through suction to harness wind energy, providing a sustainable and cost-effective alternative to traditional propulsion. It generates 6-7 times more lift than conventional sails, with low power consumption and no mechanical complexity, ensuring easy and reliable operation. Its compact design maximizes aerodynamic efficiency while minimizing impact on ship stability, deck space, and visibility. eSAIL® significantly reduces fuel consumption, lowers emissions, and helps ships meet environmental regulations like the EEXI and CII, ultimately leading to cost savings in both operational and capital expenditures. This technology is a game-changer for the maritime industry, combining environmental benefits with economic savings.

The Environmental Benefits

  • The eSAIL® technology harnesses wind power, delivering 6-7 times more lift than conventional sails
  • Different eSAIL® models: from 12m to 36m
  • bound4blue’s projected impact underscores its transformative potential: by 2027, its solutions will prevent over 400,000 tons of CO₂ emissions and save more than 130,000 tons of fuel
  • Reduce the GHG emissions up to 40%, depending on each case or routes

The Financial Benefits

  • Expected results installation 1: With two 17-meter-high sails on the Eems Traveller, bound4blue achieves annual savings of 245 tons of CO2 and 76.7 tons of fuel, equivalent to approximately a 10% reduction, leading to a noteworthy $57,525 annual savings
  • Alternative fuels, such as wind, are unlimited and free, unlike conventional fuels with fluctuating prices.

Target client profile

Activity Region

  • Headquarters
  • Activity

Company Profile

bound4blue

bound4blue develops eSAIL®, an automated wind-assisted propulsion system for fuel savings and emission reduction.

Headquarters 08210 Barberà del Vallès, Barcelona, Spain
Type Company
View company profile Solution website

Co-Labelling Scheme

Ocean Solution Label

The Solar Impulse Foundation (SIF) has partnered with the Sustainable Ocean Alliance (SOA) to promote and certify ocean-positive solutions through the launch of the Ocean Solution Label. This partnership leverages SIF’s established Efficient Solution Label and SOA’s extensive network and expertise in ocean sustainability to recognize and support companies that contribute to ocean health while being economically viable.

In addition to obtaining the Solar Impulse Efficient Solution Label, this Solution has also successfully met all the conditions to obtain the Ocean Solution Label, validating its significant positive impact on ocean health. Learn more

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The information set out above, is solely for the purposes of information and the Solar Impulse Foundation does not provide any guarantee as to its authenticity, completeness or accuracy. This information does not constitute investment advice or a recommendation to buy into, transact or to enter into any agreement with any of the parties or persons mentioned above. Potential investors or interested parties are solely responsible for their investment or business decisions and for performing any due diligence required by the circumstances. The innovator bound4blue has asserted ownership of the intellectual property rights for images, videos, and content showcased above, affirming full and unrestricted usage rights, and has provided explicit permission for the Solar Impulse Foundation to publish such information designated as "public" in the application form.