Methane emission quantification is the process of measuring how much methane is actually escaping from a source, expressed as a rate or volume over time. Unlike simple leak detection, which confirms whether a leak exists, quantification tells you how significant that leak is. For gas network operators, this distinction is increasingly important, as EU regulations now require not just finding leaks but understanding and reporting their scale.
The sections below unpack how quantification works in practice, why it matters for compliance, and who carries the responsibility across the gas supply chain.
How is methane emission quantification actually measured?
Methane emission quantification is measured by analysing the concentration of methane in the air above or around a source and combining that data with wind speed, atmospheric conditions, and spatial measurements to calculate an emission rate, typically expressed in litres per hour or cubic metres per year. The result is a number, not just a signal.
Several methods are used in practice. Ground-based surveys use handheld or vehicle-mounted sensors to measure methane concentrations along a pipeline route. Airborne methods, including helicopter-based laser systems, can cover large areas rapidly while measuring methane columns from above. More advanced techniques apply Differential Absorption LIDAR (DIAL), which uses laser pulses at different wavelengths to detect and quantify methane with high precision across wide survey areas.
The choice of method depends on the infrastructure type, the required detection sensitivity, and the area to be covered. For large-scale pipeline inspection services, airborne quantification offers a significant advantage in both speed and coverage compared to walking surveys.
What’s the difference between leak detection and emission quantification?
Leak detection identifies whether methane is escaping from a specific point. Emission quantification goes further by measuring how much methane is escaping, providing an actual emission rate rather than a binary present-or-absent result. Detection finds the problem; quantification tells you how serious it is.
This distinction has real operational consequences. A network operator running a detection-only survey knows where leaks are but not which ones to prioritise. With quantification data, repair teams can rank leaks by severity, allocate resources to the highest-emitting sources first, and demonstrate to regulators that emissions are being actively managed and reduced over time.
In regulatory terms, LDAR programmes that include quantification provide a much richer evidence base than detection alone. They support emissions reporting, trend analysis, and verification of repair effectiveness.
Why does methane emission quantification matter for EU compliance?
EU Regulation 2024/1787, which governs methane emissions in the energy sector, requires gas network operators to conduct regular LDAR surveys and report quantified emissions data. Compliance is mandatory, and penalties for non-compliance can reach up to 20% of annual turnover. Quantification is no longer optional; it is a legal requirement built into the inspection framework.
The regulation also introduces Type 2 requirements for underground equipment, which demand higher-sensitivity detection methods capable of identifying leaks that would be invisible to standard survey tools. This pushes operators toward advanced measurement technologies that can both detect and quantify emissions reliably.
Beyond avoiding penalties, quantification data supports the transparency obligations in the regulation. Operators must be able to demonstrate the scale of their emissions, show progress over time, and provide verifiable data to national authorities. Surveys that produce only qualitative results cannot meet these requirements.
What emission rates can modern quantification technology detect?
Modern airborne quantification technology can detect leakage rates from as low as 150 litres per hour under operational wind conditions of up to 24 km/h. This level of sensitivity is sufficient to identify leaks that would go unnoticed by less precise methods, making it well suited to the high-sensitivity requirements of EU Methane Regulation Type 2 for underground equipment.
The practical detection threshold depends on several factors: the measurement method used, survey altitude and speed, wind conditions at the time of the survey, and the type of infrastructure being inspected. Airborne laser-based systems operating at 100 to 150 metres altitude and measuring 1,000 data points per second offer a combination of sensitivity and coverage that ground-based methods cannot easily match at scale.
For network operators managing hundreds or thousands of kilometres of pipeline, the ability to maintain high sensitivity at survey speeds of up to 180 km/h means that large networks can be inspected thoroughly within the shortened inspection intervals now required under EU rules.
Who is responsible for methane emission quantification on gas networks?
Responsibility for methane emission quantification on gas networks falls primarily on Transmission System Operators (TSOs) and Distribution System Operators (DSOs). These organisations own and operate the pipeline infrastructure and are the regulated entities under EU Regulation 2024/1787. They are legally accountable for conducting LDAR surveys, quantifying emissions, and reporting results to national authorities.
In practice, most operators commission specialist inspection providers to carry out the technical surveys. The operator retains regulatory responsibility but delegates the measurement work to companies with the appropriate equipment and certifications. This is particularly common for airborne surveys, which require specialist aircraft, sensors, and data processing capabilities that most network operators do not hold in-house.
Across Europe, 43 Transmission System Operators manage approximately 200,000 kilometres of transmission pipelines, alongside a large number of regional and local distribution operators. Each of these organisations must meet the inspection and reporting obligations set out in the regulation, making qualified quantification services an essential part of their compliance infrastructure.
How are methane quantification results reported and acted on?
Methane quantification results are typically delivered as georeferenced data showing the location, concentration, and calculated emission rate of each detected source. Operators receive this data through reporting platforms, often including Web GIS tools that allow survey results to be viewed on maps, filtered by severity, and shared with field teams for follow-up action.
Once results are in hand, the standard workflow involves verifying each indication, prioritising repair based on emission rate, scheduling field repair teams, and then re-inspecting to confirm that emissions have been reduced. This loop between survey, repair, and re-survey is the operational core of any effective LDAR programme.
For regulatory reporting, quantification data feeds directly into the emissions inventories that operators must submit to national authorities. The ability to export structured, auditable data from survey results makes compliance reporting significantly more straightforward than manually compiled records.
How ADLARES supports methane emission quantification
We provide end-to-end airborne methane emission quantification services using our CHARM® technology, the world’s only DVGW-approved airborne gas remote detection system. Our surveys are designed to meet the demands of large-scale gas network operators who need fast, sensitive, and regulatory-compliant inspection results.
- High-sensitivity detection: CHARM® detects leakage rates from 150 l/h, meeting EU Methane Regulation Type 2 requirements for underground equipment.
- Large-scale coverage: Helicopter surveys at up to 180 km/h and 1,000 measurement points per second mean we can inspect extensive networks within tight regulatory timelines.
- Quantified results, not just detection: Our surveys produce emission rate data for each indication, supporting prioritised repair and formal emissions reporting.
- Secure Web GIS delivery: Results are accessible on a secure online platform, viewable on desktop and mobile, making it easy for operators to verify findings and brief field teams.
- Over 250,000 km surveyed: Our operational track record across European gas networks means we understand the practical and regulatory requirements operators face.
If your organisation needs to meet LDAR obligations under EU Regulation 2024/1787 or wants to understand the scale of emissions across your network, we are ready to help. Contact our team to discuss your inspection requirements and find out how CHARM® can support your compliance programme.