Our Fleet Performance Department works hard to ensure that vessels under OSM Thome ship management are energy efficient. Your ships need energy efficiency for four reasons:

  • SHIP FUEL CONSUMPTION REPORTING: We help you save fuel; you save money.
  • IMPROVED SHIP PERFORMANCE: We optimize the speed and effectiveness of your vessel, and you save time at sea and money.
  • EU MRV and IMO DCS: Our solutions are fully compliant with MRV and DCS reporting.
  • ENVIRONMENT: Our data helps you to create environmental and sustainability reports, so you have a full overview of your environmental adequacy, both for your own records and towards your customers.

OSM Thome’s tools and competence to monitor and improve fuel consumption on ships managed by our company. Our in-house data collection system (VRS) is tailor-made to collect all necessary data to track the environmental footprint of your ship, improve ineffectiveness, and give you necessary voyage and vessel information. Additionally, we ensure that vessels operating under OSM Thome management are contributing to the overall goal of reducing the GHG emissions from ships.


OSM Thome maintains an advanced data collection system (VRS) which enables us to provide you with an in-house online daily reporting system on your ship’s energy efficiency. Our system collects data from your vessels such as the speed, distance, consumption, garbage, cargo, port calls, etc. and reports to you on how to save energy. VRS provides dashboards and analysis reports.

VRS presents a clear picture of ship fuel consumption reporting by giving owners, operators, and captains the total fuel utilization overview in the fleet. In addition, insights into the root causes of individual vessels through a highly user-friendly interface can be provided by VRS.


All the data we collect from your vessel is utilized for ship performance optimization:

Hull Performance Optimization

One of the most important factors for your ship is to be energy efficient. Increased hull friction from fouling can give you a large loss in terms of increased fuel consumption. OSM Thome monitors how the vessel is operated and assists to improve hull performance. We have strong competence in anti-fouling, hull cleaning technologies, and fouling risk in different conditions and areas.

Speed And Consumption Tables And Calculator

OSM Thome’s expertise is also utilized to give you strong estimates on the expected consumption of your vessel on your next voyage – a valuable factor in voyage planning and budget.

Daily Monitoring Of Auxiliary And Boiler Fuel Consumption Reports

The system provides daily monitoring reports on fuel expenditure. OSM Thome can also assist you to reduce it.


What is the IMO and why is there a need for Energy Efficiency?

The IMO stands for International Maritime Organization, which is a specialized agency of the United Nations that regulates international shipping. One of IMO’s primary objectives is to promote safe, secure, and efficient shipping practices while also minimizing the industry’s impact on the environment.

Shipping is a significant contributor to global greenhouse gas emissions, which contribute to climate change and other environmental issues. Improving energy efficiency can reduce the amount of fuel consumed by ships. This can lead to lower greenhouse gas emissions, air pollution, and other environmental impacts. Additionally, improving energy efficiency can reduce operating costs for ship owners and operators, which can enhance their competitiveness in the market.

The IMO has recognized the importance of energy efficiency and has taken several measures to improve the energy efficiency of ships which include the development of technical standards for ship design and operation, the promotion of best practices, and the implementation of regulatory frameworks aimed at reducing greenhouse gas emissions from ships.

By improving energy efficiency in the maritime industry, the IMO aims to reduce greenhouse gas emissions, lower shipping costs, and enhance the industry’s sustainability.

What measures have been adopted by IMO to meet the GHG targets?

  • In 2011, a new chapter “Energy efficiency” was included in MARPOL Annex VI. Energy Efficiency Design Index (EEDI) for new ships and Ship Energy Efficiency Management Plan (SEEMP I) for all ships were adopted.
  • In 2016, IMO adopted the mandatory IMO Data Collection System (DCS) for ships to collect and report fuel oil consumption data from ships over 5,000 GT in SEEMP II.
  • In 2020, 0.50% sulphur limit entered into force – cutting total sulphur oxide emissions from shipping by over 75%.
  • In 2021, IMO adopted short-term measures through EEXI and CII requirements to reduce carbon intensity of all ships by 40% till 2030, compared to 2008.
  • In 2023, CII Regulations and SEEMP III came into force.

What are the various operational indices adopted for energy efficiency monitoring?

The major operational indices adopted for energy efficiency monitoring of ships include:

  • Energy Efficiency Operational Indicator (EEOI)
  • Annual Efficiency ratio (AER)
  • CII (Carbon Intensity Indicator) ratings

These indices are utilized to track and enhance the energy efficiency of ships under different operational scenarios. They assist in identifying areas where energy efficiency can be improved, enabling ship operators to take corrective measures and reduce fuel consumption and emissions.

What are the differences between EEOI and AER?

EEOI (Energy Efficiency Operational Indicator) and AER (Annual Efficiency Ratio) are both metrics used to measure the energy efficiency of ships, but they differ in the following areas:

EEOI is a real-time measurement that calculates the amount of CO2 emitted by a ship per transport work by taking the cargo weight into consideration.

AER is an annual measurement that calculates the amount of CO2 emitted by a ship per transport work by taking the vessel’s design deadweight into consideration.

What is CII?

CII stands for Carbon Intensity Indicator, which is a rating system used to measure and compare the carbon emissions of different ships. The CII rating system was developed by the IMO as part of its efforts to reduce greenhouse gas (GHG) emissions from shipping.

The CII is measured as carbon emitted (grams of CO2) by a ship per unit of transport work.

The system takes into consideration factors such as the ship’s capacity, distance travelled and fuel consumption to determine its carbon intensity.

For different ship segments, the CII is based on different ways of measuring the carbon footprint of the transport work. The Annual Efficiency Ratio (AER) and capacity gross ton distance (cgDist) are two such CIIs using different units. Whenever the cargo is weight-critical, AER (emissions per dwt-mile) is used, and when the cargo is volume-critical, cgDist (emissions per gross ton-miles).

What is the difference between the EEXI and the CII?

EEXI is a one-time certification applicable to vessels of 400 GT & above concerning only the design parameters of the vessels.

The CII is an operational indicator applicable to vessels of 5000 GT & above. This will be assessed annually from 2023 with yearly stricter emission limits. The EEXI and CII are applicable to the same ship types.

What are IMO’s energy efficiency/GHG targets?

The IMO has established various energy efficiency and greenhouse gas (GHG) targets to decrease the environmental impact of the maritime industry.

One of the main objectives is to lower the overall annual GHG emissions from international shipping by 50% or more by 2050 compared to the levels of 2008. In addition, the organization aims to enhance the carbon intensity of shipping by at least 40% by 2030, compared to 2008 levels.

The IMO plans to phase out the use of heavy fuel oil in the Arctic by 2024 and improve the energy efficiency of ships by a minimum of 30% by 2025, compared to 2014 levels. The IMO has established technical and operational measures, market-based measures, and regulatory frameworks to achieve these goals.

What is the difference between EEDI and EEXI?

EEDI stands for Energy Efficiency Design Index, while EEXI stands for Energy Efficiency Existing Ship Index.

EEDI is a metric used to measure the energy efficiency of new ships (Building contract on or after 1st January 2013) during the design phase, while EEXI is a metric used to measure the energy efficiency of existing ships.

Both EEDI & EEXI consider the ship’s size, type, propulsion system, aux engines, etc. to provide a rating that measures the energy efficiency of the ship’s design.

What are the different Ship Energy Efficiency Management Plans required to be maintained by the vessels? What is the significance of SEEMP I, II, and III?

The Ship Energy Efficiency Management Plan (SEEMP) is a mandatory requirement for ships to enhance their energy efficiency and reduce carbon emissions. The different SEEMP parts are important because they serve different purposes:

  • SEEMP Part I: The Initial SEEMP is a measure to encourage the implementation of ship-specific energy efficiency measures that result in reduced fuel consumption on board. This plan is mandatory for all ships of 400 gross tonnages and above, regardless of age or propulsion system. Various options to improve energy efficiency include speed optimization, weather routing, hull maintenance, etc.
  • SEEMP Part II: Starting from 2019, all ships of 5000 gross tonnage and above, must monitor and report their annual fuel oil consumption data. Part II of the SEEMP relates to this mandatory obligation and provides detailed information on this monitoring and reporting scheme.
  • SEEMP Part III: The Ship Energy Efficiency Management Plan (SEEMP) Part III is a Ship Operational Carbon Intensity Plan and includes:
    • a description of the calculation methodology for the ship’s attained annual operational CII.
    • an implementation plan documenting how the required annual operational CII will be achieved.
    • a procedure for self-evaluation and improvement.
    • In case of a D rating for three consecutive years or one E rating, the SEEMP Part III must be updated with a corrective action plan and verified before the SoC can be issued.

By maintaining these different Ship Energy Efficiency Management Plans, vessels can continuously monitor their energy efficiency performance, identify areas for improvement, and take action to reduce their carbon footprint.

How can existing vessels which are presently not meeting EEXI, comply with the IMO’s requirements?

Existing vessels that are not meeting the EEXI (Energy Efficiency Existing Ship Index) requirements can take several steps to comply with the IMO’s requirements. Some possible measures are:

  • Engine Power Limiting solutions (EPL)
  • Shaft Power Limitations (Shapoli)
  • Installation of Energy Saving Devices (ESDs) for propulsion: ESDs help vessels reduce fuel consumption and emissions by increasing the efficiency of the ship’s propulsion system. Some commonly used ESDs are:
    • Propulsion Improvement Devices (PID) such as propeller ducts and finned propeller caps, etc.
    • Hull Modifications like Bulbous Bow Optimisations or Jumboization.
    • Special Hull Coatings
    • Air Lubrication Systems & Wind Assisted Propulsions.
    • Waste Heat Recovery Systems, Photovoltaic Cells, etc.

What is CII Rating?

Ships are categorized into Bands “A” to “E” (where A is best). The bands are defined as:

  • Band A: Ships emitting the least amount of CO2 per transport work.
  • Band B: Ships emitting a higher level of CO2 per transport work compared to Band A, but lesser than Band C.
  • Band C: Ships emitting a higher level of CO2 per transport work compared to Band B, but lesser than Band D.
  • Band D: Ships emitting a higher level of CO2 per transport work compared to Band C, but lesser than Band E.
  • Band E: Ships emitting the highest amount of CO2 per transport work.

The goal of the CII rating system is to incentivize shipping companies to operate more carbon-efficient vessels by encouraging them to choose ships with lower CII.