Methane accountability now determines market access in the global energy system. Regulators and buyers expect credible emissions data across the entire natural gas value chain. Yet most operators still do not measure methane emissions from LNG shipping, which has created a critical gap.
We expect this gap to close quickly. The European Union Methane Regulation (EUMR) now requires methane transparency to imported energy products. LNG exporters must quantify emissions not only at production sites but also during loading, transport and unloading.
Incorporating direct measurement of shipping emissions into your measurement strategy solves two problems at once: It closes the data gap and protects market access through strengthened credibility.
LNG shipping is emerging as the next methane accountability frontier
Regulators now monitor methane more closely than any other greenhouse gas in the energy sector, and the oil and gas industry accounts for the largest share of human-caused methane emissions globally. LNG is at the center of this conversation because of its role in international energy trade.
According to the International Energy Agency, 15–30% of global natural gas production moves through LNG trade and continues to increase each year. For policymakers, methane accountability across LNG supply chains provides a direct mechanism to meet climate targets and maintain energy security.
Source: International Gas Union, 2025 World LNG Report
The EUMR formalizes this approach. Beginning in 2027, EU importers must report methane emissions associated with imported LNG, oil and coal, with methane intensity limits scheduled to take effect in 2030.
These requirements expand the emissions boundary from upstream production to the full supply chain. For LNG exporters and shippers, operators can no longer treat shipping emissions as a blind spot.
If you export LNG into regulated markets, this raises a practical question: How do you routinely collect, organize, analyze, and report on real-world data to prove methane performance from wellhead to end user?
How measurement builds a defensible well-to-wake methane profile
Operators increasingly combine upstream well-to-water emissions data with measurements from LNG transport activities. In practice, closing this gap requires two types of measurement.
Accurate shipping measurements contribute two critical data streams:
- Fugitive emissions from valves, flanges and other equipment during loading and unloading
- Methane slip from engines caused by incomplete combustion
These measurements replace assumptions with real operational data. Many emission factors developed years ago no longer reflect modern vessel technology or operational conditions. For LNG exporters selling into methane-regulated markets, verified measurement drives both regulatory assurance and commercial advantage.
Where methane escapes during LNG loading and unloading
Field surveys identified fugitive emissions occur at multiple points during LNG transfer operations.
To identify these leaks from components such as valves, connectors and flanges, technicians conduct vessel surveys during loading or unloading activities using optical gas imaging (OGI) cameras. A typical survey requires approximately eight hours. After detecting leaks with OGI technology, technicians quantify emissions using high-flow samplers or flame ionization detectors (FID).
Our measurements show a clear pattern. Engines that run on boil-off gas produce the lowest methane emissions across operating conditions.
This insight carries immediate operational value. Operators can repair identified leaks during or shortly after measurement campaigns, reducing emissions while strengthening the integrity of reported emissions inventories.
When operators develop annual methane inventories, the measurement data refines assumptions about leak duration and repair timelines. This approach produces emissions estimates that regulators and third-party auditors can verify with confidence.
LNG operators managing methane transparency requirements should use these surveys to go beyond checkbox compliance data and reveal where emissions actually occur and where operational improvements deliver the largest reductions.
Why engine methane slip often goes underestimated
LNG vessel engines create the second major source of methane emissions during shipping. These carriers commonly use boil-off gas (BOG) as a fuel source for propulsion systems. However, incomplete combustion allows methane to escape through a process known as methane slip.
Fourier transform infrared spectroscopy (FTIR) stack testing provides the most accurate method for measuring methane slip. Our measurement results show that engines fueled with boil-off gas produce the lowest methane emissions across operating conditions. Engines running on low-sulfur fuel oil (LSFO) and diesel auxiliary engines produce significantly higher methane slip under certain loads.
These findings reinforce a central lesson for operators. Combustion emissions change significantly with operating conditions, which means single emission factors rarely capture real-world performance.
Operators that combine FTIR measurement data with vessel operational records more accurately calculate annual methane emissions. Without measurement verification, operators risk overstating or understating their methane footprint, which can open the door to both regulatory and reputational risk.
From blind spot to competitive advantage
Shipping emissions once remained largely invisible. But updated measurement technologies provide operators with the tools to quantify emissions during loading, transport and unloading with scientific confidence.
Operators that invest in these measurements gain advantages across several dimensions.
- Improved operational intelligence. Measurement campaigns identify equipment failures, inefficient engines and operational practices that contribute to methane emissions.
- Protected market access. Demonstrated methane transparency helps LNG exporters maintain access to markets where emissions reporting requirements continue to expand.
- Strengthened credibility with financial partners and regulators. Verified data builds confidence in reported emission inventories and climate commitments.
LNG shipping once operated outside the methane accountability conversation. The combination of regulatory and stakeholder pressure coupled with advancing measurement methods is bringing this blind spot into focus, making transparency a market qualifier. Operators that quantify shipping emissions present a complete, defensible methane profile and secure their place in markets where transparency defines competitiveness.
