FuelEU Default vs Actual Cslip, EU ETS CH₄ Value, ELM, Methane Slip File, Verification & Payback

FuelEU Methane Slip Measurement ROI, Engine-Load Monitoring & Actual Cslip Value Tool

Decide whether paying for methane-slip measurement and continuous engine-load monitoring is worth more than accepting the FuelEU default factor. Compare default and measured well-to-wake intensity, quantify the FuelEU compliance-balance swing, calculate EU ETS methane allowance savings, risk-adjust the result for verifier acceptance, build the Methane Slip File investment case, project tightening FuelEU limits, and find the measured Cslip needed to hit a target payback.

Currency
Currency selector changes display only. No exchange-rate conversion is performed.

Engine, Fuel & Regulatory Basis

FuelEU Annex II assigns different default Cslip values to LNG engine classes. The measured value in this tool is an investment assumption until the measurement, load-monitoring, documentation and verification pathway has been completed and accepted for the applicable EU reporting framework.

% fuel mass
% fuel mass
DNV has cited slow-speed LNG Otto engines achieving values as low as 0.7% versus the 1.7% standard factor. Use your engine-specific measurement expectation.
t/year
%
Enter the proportion of the modeled LNG emissions that falls inside the applicable EU ETS geographical scope.
%
Ignored when status is set to verifier-approved.

Simple Measured-Factor Case

%
%

Engine-Load / Methane-Slip Curve

The Commission's interim FuelEU pathway uses continuous engine-load monitoring and emission curves derived from accepted measurements. Use fuel share rather than simple time share when possible. The weighted actual Cslip below replaces the simple measured-factor input in Advanced mode.

Load bandRepresentative load %Annual fuel share %Measured Cslip %

FuelEU Well-to-Wake Factors

MJ/g fuel
gCO₂e/MJ
gCO₂/g fuel
gCH₄/g fuel
gN₂O/g fuel
FuelEU TtW calculation currently points to RED Annex V values.
EU MRV / ETS uses the GWP values referenced through Delegated Regulation (EU) 2020/1044.
GJ/year
gCO₂e/MJ

FuelEU & EU ETS Economic Value

gCO₂e/MJ
gCO₂e/MJ
0 = use the regulation schedule for each projection year.
€/ t VLSFO-eq
MJ/t
€/ tCO₂e
Use only if the company assigns a real pooling / banking / internal value to extra positive compliance balance. Default is zero to avoid inventing a market price.
€/ tCO₂e
%

Measurement, ELM, Verification & Engine-Upgrade Cost

€
€
€
€
€
€
%
€/ year
€/ year
€/ year
€/ year
€/ year

Investment Horizon

years
%
%
years

FuelEU / MRV Verification Readiness

Regulatory and investment screening only: This tool does not determine whether a measured methane-slip factor will be accepted by a FuelEU verifier, competent authority, EU MRV verifier or emissions-trading authority. It is not an accredited emissions test, CEMS certification, Methane Slip File, FuelEU verification report, monitoring-plan amendment or legal interpretation. Commission guidance issued in October 2025 was explicitly interim. IMO adopted MEPC.414(84), MEPC.415(84) and MEPC.416(84) in 2026; confirm how current international methods are accepted under the EU framework before relying on savings.
Current regulatory basis: FuelEU Maritime uses well-to-wake GHG intensity and includes CO₂, CH₄ and N₂O. Annex II LNG defaults include Cslip of 3.1% for Otto dual-fuel medium-speed engines, 1.7% for Otto dual-fuel slow-speed engines, 0.2% for LNG diesel dual-fuel slow-speed engines and 2.6% for LBSI. The FuelEU reference intensity is 91.16 gCO₂e/MJ, reduced by 2% from 2025, 6% from 2030, 14.5% from 2035, 31% from 2040, 62% from 2045 and 80% from 2050. The statutory penalty formula uses €2,400 per 41,000 MJ VLSFO energy equivalent. EU ETS maritime covers CH₄ and N₂O from 2026. FuelEU currently applies RED Annex V GWP100 values of CH₄ = 25 and N₂O = 298 in its TtW methodology, while EU MRV / ETS uses CH₄ = 28 and N₂O = 265 under Delegated Regulation (EU) 2020/1044. The Commission published interim actual-methane-slip reporting / verification guidance on 8 October 2025, while IMO adopted updated CH₄/N₂O measurement, engine-load-monitoring and CEMS guidelines at MEPC 84 in 2026. Sources: European Commission FuelEU · EC methane-slip guidance · IMO MEPC 84 resolutions · EU MRV / ETS GWP values.
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