As a second engineer how will you plan to reduce the Energy Efficiency Operating Index (EEOI) of your ship?

The EEOI is the operational carbon-intensity indicator = g CO2 per transport work (tonne-nautical mile). Reducing it means carrying the same cargo a given distance with less fuel. As 2nd Engineer (responsible for the machinery) I would plan a multi-pronged operational and technical programme:

1. Fuel/engine optimisation:

• Ensure the main engine and auxiliaries are tuned to their operating point - correct fuel injection timing, atomisation, turbocharger condition and air ratio, and the combustion quality; clean/optimise injectors and pumps; keep the engine operating in its most efficient speed/power (use the optimum propeller law; avoid overloaded or off-design operation).
• Operate auxiliaries at optimal load; parallel generator operation/optimisation, run the minimum generators on economical load, and use waste-heat recovery.

1. Propulsion/hull efficiency:

• Keep the hull and propeller clean (planned underwater cleaning, propeller polishing) to reduce resistance/fouling - this is the single biggest operational enabler.
• Reduce propeller slip by correct trim and ballast handling; correct the trim (bow-up/bow-down) and adjust the draught/ballast plan to optimise propulsive efficiency.
• Minimise auxiliary electrical load (lights, ventilation, air-conditioning, galley) through energy-awareness, sensor/occupancy control and operating where possible on the most efficient machinery.

1. Operational data/energy management:

• Install/use an energy monitoring system measuring fuel flow and power; analyse the data to establish the baseline and identify waste; compute the monthly EEOI and share with the Master.
• Coordinate with the Master on slow steaming / virtual arrival and speed management (reduce speed reduces cubic fuel); align with the EEXI/SEEMP and CII targets.
• Implement the SEEMP improvement measures: voyage planning, optimisation of ballast, use of weather routing, main engine rpm/speed adjustments.

1. Waste heat and auxiliaries:

• Use waste-heat systems (e.g. recover waste heat for heating); optimise the cooling/heating loads.
• Segregate and use the appropriate generators (most efficient), stop unnecessary machinery in port.

1. Maintenance/critical awareness:

• Ensure filters, coolers, and the propulsion system are in good condition (reduced friction/inefficiency); keep the fuel treatment and separators in order (clean fuel = good combustion).

1. Reporting: Keep fuel and voyage data records per the DCS/MRV and the SEEMP; report the attained EEOI/CII to the flag/RO; and promote a fuel-conscious culture among the crew.

This planned reduction of the EEOI (total CO2 per tonne-mile) directly cuts fuel and GHG, meets the CII/EEXI/MRV and SEEMP requirements, and improves the environmental and economic performance of the ship.