Improving the ship’s EEDI score
By directly replacing main engine power, Rotor Sails are improving the EEDI score of a ship. According to IMO MEPC.1/Circ. 815 the Rotor Sails are a category B.2 innovative technology that contribute to energy savings. Based on global wind statistics, the available effective power delivered by the Rotor Sails is deducted from the main engine power per specific DWT and Vref speed. The improvement in the EEDI rating achieved can reach up to 20% for suitable Rotor Sail arrangements and optimal configuration on a ship.
Supporting the required EEXI compliance for existing ships
In view of the MEPC 75 approved amendments to MARPOL Annex VI, ships above 400 GRT will have to demonstrate by their first periodical survey after 1/1/2023 an ’Energy Efficiency design Index for Existing ships’ (EEXI). A vessel’s CO2 emissions per ton-mile is required to be reduced at a range of 10%-30% from 2008 EEDI baselines, depending on ship type and size. Currently over 70% of the global fleet is not certified for EEDI, therefore many ships will be forced to impose large main engine power limitations, steam at slower speeds and take any extra measures in order to achieve EEXI compliance, such as improving their commercial competitiveness overall. Norsepower Rotor Sails can relieve such power limitations and support technical compliance over reaching EEXI score for existing ships, with fast retrofit schemes and easy to use, fully automated adaptation.
Operational carbon footprint reductions
Norsepower’s Rotor Sails can contribute to the reduction of the Operational CO2 emissions per Ton-Mile, which is a major voyage-related carbon footprint figure determining the operational efficiency of a given ship, used in numerous regulatory and market related ship efficiency criteria such as:
- IMO GHG CII (Carbon Intensity Indicator)
- AER (Average Efficiency Ratio)
- EEOI (Energy efficiency Operational Index)
Extensive measurement campaigns on reference vessels have proven the operational performance of Rotor Sail technology. For example, during the first year of operation the Rotor Sails on the Maersk Pelican reduced the fuel burn by 8.2%. This translates to 8.2% carbon footprint reduction, significantly improving the operational compliance.
Rotor Sails are compatible with all other means of fuel saving and emissions reduction technologies. When combined with weather routing, voyage optimization and integrated power management, Norsepower’s Rotor Sails can significantly contribute to any voyage (laden or ballast) related carbon footprint reduction. Such power savings on board will enable the ship to achieve great climate alignment compliance scores, specifically for the Poseidon Principles ship finance portfolios and SeaCargo charter clauses, while simultaneously providing positive emission ratings to the IMO’s CII. These savings improve the ship’s commercial competitiveness, trade utilization, and profitability on an annual basis, while also maintaining a fully regulatory compliant, attractive asset value.