Wärtsilä EnergoFlow

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Wärtsilä EnergoFlow for improved energy efficiency

Vessel owners are facing the twin challenges of ensuring compliance with the IMO’s Energy Efficiency Existing Ship Index (EEXI) and Carbon Intensity Index (CII) measures while also needing to improve operational efficiency in order to remain competitive. Wärtsilä EnergoFlow is an innovative pre-swirl stator that improves a vessel’s propulsive efficiency by creating an optimal inflow for the propeller, reducing both fuel consumption and emissions.

Wärtsilä EnergoFlow creates optimal inflow for the propeller by guiding one side of the stern flow in the opposite direction to the propeller rotation, generating pre-swirl. The solution consists of multiple curved fins and a ring attached to the ship’s hull to prevent the power losses that typically occur in a propeller’s slipstream.

Key benefits

  • Improve fuel efficiency by up to 10% in combination with a new propeller design and Wärtsilä EnergoProFin
  • Reduce NOx and CO2 emissions
  • Take steps towards EEXI compliance through minimum speed reduction
  • Improve vessel CII rating
  • Fast return on investment of one to two years

    Technical info

    Scope of supply

    • System design, supply and class certification
    • Trailing Edge Modification (for fixed pitch propellers)
    • Installation drawings and instructions
    • Design interface with the shipyard or ship designer
    • Supervision by Wärtsilä technicians during installation
    • New, optimised propeller (optional)
    • Scale models of EnergoFlow and/or propeller for tank testing purposes (optional)


    The EnergoFlow system is suitable for a wide range of vessels fitted with either fixed pitch or controllable pitch propellers. The system is easily integrated with these solutions whether they have been originally supplied by Wärtsilä or other manufacturers.

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