FuelEU Default vs Actual Cslip, EU ETS CH₄ Value, Engine-Load Monitoring, Methane File, Verification & ROI

FuelEU Methane Slip Measurement ROI & Actual Cslip Tool

Test whether replacing the FuelEU Annex II LNG methane-slip default with a verified actual Cslip is financially worthwhile. Compare default and actual well-to-wake intensity, FuelEU compliance balance and penalty exposure, EU ETS methane allowance value, measurement and engine-load-monitoring cost, risk-adjusted payback and the Cslip improvement needed to justify the project.

Data type
Currency
Currency selection changes display only. No exchange-rate conversion is performed.
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Need much more depth? Click Advanced above. Add the engine-load/Cslip curve, fuel-mass weighting, whole-ship FuelEU energy mix, Methane File readiness, measurement-cost breakdown, uncertainty range and multi-year cash flow.

Default vs Actual Cslip Investment Screen

The actual value is a planning or measurement input until the applicable reporting and verification path accepts it. Set acceptance probability to 100% only when that assumption is appropriate.

Sets the FuelEU Annex II default Cslip.
% of fuel mass consumed by the LNG energy converter.
t/year in the FuelEU reporting scope.
% of modeled LNG methane emissions subject to allowance surrender.
% used only for the risk-adjusted investment case.
Selected currency, one-time.
Selected currency / year.
Selected currency / tCO₂e.
Selected currency / tCO₂e of additional positive balance. Enter 0 if no internal / pooling value is assigned.

Actual-Value Reporting Path

% Cslip.
% Cslip.

Engine-Load / Methane-Slip Curve

Advanced actual Cslip is fuel-mass weighted from this table. The EU interim guidance calculates reporting-period Cslip from total methane slip mass divided by total gas-fuel mass. Use fuel share rather than time share.

Load band Representative load % Annual LNG fuel share % Measured Cslip %

FuelEU LNG Factors

Defaults reproduce the current FuelEU LNG fossil pathway used by this calculator. Keep the regulation / verified factor basis with the project file when overriding.

MJ/g fuel.
gCO₂e/MJ.
gCO₂/g fuel.
gCH₄/g fuel.
gN₂O/g fuel.
gCH₄/g slipped fuel. FuelEU Equation framework sets CsfCH4 = 1.

Whole-Ship FuelEU Energy Mix

GJ/year of non-LNG energy in scope.
gCO₂e/MJ.
gCO₂e/MJ. 0 uses the statutory schedule for the selected year.
EUR / t VLSFO-equivalent. Regulatory default.
MJ/t. Regulatory penalty constant.

Measurement, ELM & Verification Cost

%.

Investment Horizon

years.
%.
% / year.
% / year.
years, used to solve the approximate Cslip threshold.

FuelEU / MRV Verification Readiness

Regulatory and investment screening only: this tool does not determine whether an actual methane-slip factor is accepted by a FuelEU verifier, competent authority, EU MRV verifier or emissions-trading authority. It is not an accredited emissions test, CEMS certification, Methane File, FuelEU verification report, monitoring-plan amendment or legal opinion. The Commission's October 2025 methane-slip guidance was issued as interim guidance pending international standards and their acceptance under the EU framework. IMO adopted updated CH₄/N₂O measurement, ELM and CEMS guidelines at MEPC 84 in 2026; confirm the current EU acceptance path before relying on modeled regulatory savings.
Reference basis: FuelEU Maritime Annex II LNG default Cslip values used here are 3.1% for LNG Otto dual-fuel medium-speed engines, 1.7% for LNG Otto dual-fuel slow-speed engines, 0.2% for LNG diesel dual-fuel slow-speed engines and 2.6% for LBSI. FuelEU reference intensity is 91.16 gCO₂e/MJ with reductions of 2% from 2025, 6% from 2030, 14.5% from 2035, 31% from 2040, 62% from 2045 and 80% from 2050. The compliance-deficit penalty basis uses EUR 2,400 per 41,000 MJ VLSFO-equivalent. FuelEU currently uses CH₄ GWP100 25 and N₂O 298 in this TtW framework; the EU MRV / ETS GWP table uses CH₄ 28 and N₂O 265. EU ETS maritime includes CH₄ and N₂O from 2026. European Commission FuelEU · EC actual methane-slip guidance · IMO MEPC 84 resolutions · EU GWP values
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