How can I improve my GHG Rating?

Steps to improve a vessel's EVDI/GHG Rating

  1. Verify your vessel's GHG rating by requesting a GHG verification. Customers can submit a GHG verification request via the GHG Rating tab on a vessel page within the RightShip platform. Non-customers can initiate a GHG verification by emailing 
  2. Speak to a class or a qualified third party about the most appropriate energy saving equipment for your vessel.
  3. Consult RightShip for a pre-assessment of GHG Rating change by email
  4. Provide RightShip with the appropriate documentation, detailing the improvement to the EVDI.

There are various energy saving equipment options for shipowners to consider in terms of improving the GHG Rating. The energy saving equipment will need to have a positive effect on one or more of the elements contained in the EEDI/EVDI equation. For example, the speed of the vessel, engine size, specific fuel consumption, etc. so that the vessel is operating more efficiently than first designed.

The main energy saving equipment categories that can lead to a GHG Rating improvement include:

  • 'Major conversion' (e.g. alter ship dimensions, cargo carrying capacity or engine power)
  • 'Mechanical/electrical measures' (technological measures for improved energy efficiency e.g. propulsion improvements),

Note: The benefits from ‘operational measures’ such as low friction paint, cannot usually be isolated from the EVDI equation and will generally not improve the GHG Rating. They may however qualify your vessel for a plus (+) symbol next to the GHG Rating, to signify that it is operating more efficiently than designed.

For us to include this improvement in your vessel's rating, we require documentation from class or a qualified third party detailing the improvement to the vessel. This can take the form of a re-sea trial or CFD modelling. It needs to be vessel specific and outline how the energy saving equipment improves the efficiency of the vessel under EEDI/EVDI conditions e.g. the Vref at 75% main engine MCR at summer load draught.