Understanding methane intensity: Calculation and comparison

Consider two facilities reporting methane intensity for the same year. One produces oil and associated gas, while the other produces dry gas. The oil-producing facility reports a higher intensity, but that alone does not establish poorer methane performance.

Before drawing conclusions about performance, the operator needs to understand which emissions were counted, what activity they were measured against, and how both figures were calculated.

What is methane intensity and how is it calculated?

Methane intensity measures methane emissions relative to a defined production or operational activity over a stated reporting period and boundary. It is calculated by dividing methane emissions by an activity measure such as production or throughput. Unlike total methane emissions, which describe the amount released, intensity expresses emissions relative to the scale of an operation.

The emissions in that calculation may come from direct measurements, emission factors, or other estimates. Measuring or estimating the methane is a separate step from calculating the intensity. The denominator depends on the reporting method. It may be marketed gas, produced gas, total hydrocarbon production, or energy output. Results can be a percentage or a mass of methane per unit of volume or energy. A percentage is not interchangeable with a mass per unit of energy unless the conversion is stated. Two figures that share the name methane intensity are not comparable on the name alone.

Those differences continue along the natural gas value chain. The NGSI Methane Emissions Intensity Protocol (Version 3.0) notes that no single universally accepted methodology exists for calculating methane intensity or for comparing it across segments. Segment intensities cannot be directly added into a value-chain result, because the throughput basis differs by segment and the same gas can pass through more than one segment.

Which emission sources are included?

The numerator is the methane emissions in the calculation. Which sources it includes depends on the method. Those sources may include fugitives, methane released through venting, uncombusted methane from flaring, and methane emitted during fuel combustion. When one figure includes a source the other leaves out, the intensities do not cover the same emissions.

How those emissions are quantified matters as well. Even when two reports cover the same sources, differences in measurement and estimation methods can affect the emissions totals they report. The methods and the assumptions behind them have to be understood before that difference is read as a difference in operations.

How the denominator changes methane intensity

The denominator can change the calculated intensity even when the methane emissions stay the same. Take two hypothetical facilities. Each reports 100 kilograms of methane emissions for the same year, using equivalent accounting boundaries. Both use the same definition of production activity, measured in the same units. If one facility’s production activity is twice the other’s, its calculated intensity is half as high. That difference reflects the activity in the denominator, not a reduction in methane emissions.

Different reporting methods can also define gas production differently. Some use the total volume of gas produced. Other methods use marketed gas, which may exclude volumes consumed on site or otherwise adjusted according to the applicable reporting definition. Where a calculation depends on methane content, the gas composition and the conversion method also need to be understood. These differences can change the denominator even when two reports appear to use the same production data.

Production mix adds a further complication. An operation that produces both oil and natural gas may report a higher methane intensity than a dry-gas facility when its methane emissions are divided only by gas production. Oil and other coproduced liquids then sit outside the denominator, even when some of the methane is associated with producing them.

A 2026 paper in Environmental Science & Technology looked at how different methane intensity metrics change comparisons across regions with different oil and gas production mixes. Metrics that attribute the emissions only to gas production can distort those comparisons. A gas-based denominator may still be appropriate, depending on the purpose of the metric and how emissions are allocated between oil and gas production. Comparisons are most meaningful when both operators use consistent definitions and allocation methods.

Why reported methane intensity figures may differ

A methane intensity figure may be compared with a company target or a value published under a certification program. Matching units do not guarantee comparable results. A target might apply to a specific operating segment or use a different production basis. Reporting periods also need to be understood, although a target can intentionally cover a different period from the reported result.

Certification programs may also report methane intensity differently from a facility’s emissions inventory. The value published on a certificate follows the program’s reporting rules and may not be identical to the facility’s calculated inventory intensity. MiQ methane certification specifies how methane intensity is reported on its certificates.

Before comparing two published figures, check the following.

A difference in methane intensity is not yet a difference in how the facilities were operated. That conclusion depends on which emissions were counted, what production activity was used, which reporting period each figure covers, and how the methane was calculated.

Those details matter when the figure is used in a voluntary disclosure, a customer report, or a certification claim. Validere supports voluntary emissions reporting for the calculations and the reporting behind those disclosures.