Extended Operational and Trade Vocabulary

Decarbonization, Alternative Fuels and Carbon Pricing glossary (page 2)

The decarbonization and carbon-pricing vocabulary: the CII rating bands under MEPC.336(76), abatement cost per tonne of CO2eq, onboard carbon capture with amine absorbents, acceptable fuel pathways under FuelEU Maritime and the IMO LCA framework, and the sustainability class notations. Grounds each term in the efficiency regulation or the fuel-certification scheme it belongs to.

318 defined terms.

Showing 68 on this page (page 2 of 2).

P

Poseidon Principles for Marine Insurance: Analogous initiative for marine insurers.
Post-combustion capture: CO2 capture from exhaust gas after combustion, typically using amines.
Power-to-X (PtX): Family of processes converting renewable electricity to hydrogen and onward to e-fuels.
ProjectDecarbo: Stena Bulk and partners pilot on onboard CO2 capture.
Propeller polishing: Hull and propeller maintenance reducing roughness and fuel use.
Pyxis Ocean: Cargill chartered bulk carrier retrofitted with BAR Technologies WindWings (2023).

Q

Quota (EU ETS): Member State allocation of EUAs for auction; relevant to maritime via the shipping cap addition.

R

RED II / RED III: EU Renewable Energy Directives 2018/2001 and 2023/2413; define sustainability and GHG criteria for fuels counted under FuelEU.
Reference line (CII): Curve representing 2019 fleet-average AER values used to set required CII.
Reference Line (EEDI): Reference EEDI value against which design is compared.
Reformer: Onboard unit producing hydrogen from methanol, LNG, or ammonia for fuel cells.
Required CII: Annual reference value calculated using ship-type-specific reference line and Z factor.
Retrofit: Modification of an existing ship to use an alternative fuel or wind-assist device.
RightShip: Vetting and risk-management platform for dry bulk and other sectors.
RoPax: Roll-on/roll-off passenger vessel category with early uptake of LNG and battery-hybrid propulsion.
Rotor Sail: See Flettner Rotor.

S

Sabatier reaction: Catalytic reaction combining H2 and CO2 to produce CH4 in e-LNG production.
SCR (Selective Catalytic Reduction): NOx abatement using ammonia or urea; integral to many ammonia and dual-fuel installations.
Sea Cargo Charter: Framework for charterers to align with IMO climate goals.
SEEMP (Ship Energy Efficiency Management Plan): Ship-specific plan required under MARPOL Annex VI regulation 26; Part I (general), Part II (CII implementation), Part III (CII corrective action).
Shore power: OPS or cold ironing infrastructure, IEC/IEEE 80005 series.
Silverstream Clean Technologies: UK supplier of the Silverstream air lubrication system.
Slow Steaming: Operating below design speed to save fuel and reduce emissions.
SMR (Steam Methane Reforming): Standard route for gray hydrogen; blue hydrogen adds CCS.
SoC (Statement of Compliance): Flag-issued document confirming DCS reporting compliance under MARPOL Annex VI regulation 27.
SOFC (Solid Oxide Fuel Cell): High-temperature fuel cell capable of running on methane, methanol, or ammonia; tested by ShipFC and others.
Spot EUA: EU allowance traded for immediate delivery on EEX or ICE Endex.
Stena Bulk CC pilot: Onboard CCS demonstration on a Stena product tanker.
Storage spread (CO2): Cost difference between capture and geological storage; key input for shipboard CCS economics.
Super-slow steaming: Operation at speeds well below design, common during 2009 to 2015 overcapacity period.
Surrender (EU ETS): Annual delivery of EUAs by maritime operators to the administering authority; deadline 30 September each year for the prior year's emissions.
Synthetic Fuel: Fuel produced via chemical synthesis from feedstocks such as hydrogen and CO2.

T

TCO (Total Cost of Ownership): Lifecycle cost basis for comparing alternative fuel options.
THETIS-MRV: EMSA database for EU MRV reports.
Tier III NOx: Strictest IMO NOx limit applying in NOx ECAs.
TtW (Tank-to-Wake): Emissions from fuel consumption on board the ship.
Twin-fuel storage: Side-by-side or stacked tank arrangement allowing dual-fuel operation.

U

UCO (Used Cooking Oil): Feedstock for FAME, HVO, and other waste-based biofuels.
UCOME: Used cooking oil methyl ester; specific FAME subtype.
ULCC (Ultra Large Crude Carrier): >320,000 DWT crude tanker.
ULSFO (Ultra Low Sulfur Fuel Oil): 0.10% sulfur compliant residual fuel; similar GHG intensity to HFO.
Unverified emissions estimate (EU MRV): Default conservative estimate applied by the verifier when data is incomplete.

V

VCS (Verified Carbon Standard): Voluntary offset standard; not used for maritime compliance.
Ventifoil: Econowind suction wing wind-assist device using boundary-layer suction.
Verifier (EU MRV/ETS/FuelEU): Accredited body confirming reported emissions and GHG intensity data.
Virtual arrival: Practice in which speed is reduced based on confirmed berth availability to lower emissions.
VLCC (Very Large Crude Carrier): Tanker between 200,000 and 320,000 DWT.
VLSFO (Very Low Sulfur Fuel Oil): 0.50% sulfur compliant residual fuel; FuelEU's 91.16 g CO2eq/MJ reference value is broadly based on its energy and CO2 characteristics.
Voluntary Carbon Market (VCM): Market for non-compliance carbon credits; relevant for shipowner net-zero claims.

W

WBCSD: World Business Council for Sustainable Development; publishes corporate GHG accounting guidance with WRI.
Weather routing: Optimum-track routing per environmental forecasts.
Well-to-Tank (WtT): Emissions associated with fuel production and delivery to the ship.
Well-to-Wake (WtW): GHG accounting basis for GFI under MARPOL Annex VI Chapter 5.
Wind-assist propulsion: Use of rotors, wings, kites, or suction wings to provide thrust and reduce fuel use.
WindWings (BAR): Solid wing sail system jointly developed by BAR Technologies and Yara Marine.
WinGD X-DF: Low-pressure dual-fuel two-stroke engine family.
WinGD X-DF-A: Ammonia dual-fuel two-stroke engine.
WinGD X-DF-M: WinGD two-stroke methanol-capable dual-fuel engine.
WisaMo: Inflatable wing sail system developed by Michelin.

X

X DF: WinGD dual fuel two stroke engine family using low pressure Otto cycle.
X-DF-A: Ammonia variant of WinGD's X-DF engine family.
X-DF-M: Methanol variant of WinGD's X-DF engine family.

Y

Yara Birkeland: Pioneering autonomous battery-electric container ship.
Yara Clean Ammonia: Yara unit developing clean ammonia supply for marine fuel.
Yara Marine Technologies: Supplier of SCR, scrubbers, and (with BAR) WindWings.

Z

Z factor (CII): Annual reduction factor tightening the required CII versus the 2019 reference under MEPC.338(76).
Zero Carbon Fuel: Fuel with no direct CO2 emissions at the point of use, such as ammonia or hydrogen.
Zero-Emission Shipping Mission (ZESM): Mission Innovation track targeting commercially viable zero-emission ships by 2030.