Data story: Global methane detections from space — what satellite data reveals about unreported emissions

Why It Matters

Methane is responsible for roughly 30 percent of global warming since pre-industrial times, yet national greenhouse-gas inventories routinely undercount it. A 2024 analysis by the International Energy Agency (IEA, 2024) found that actual methane emissions from oil and gas operations alone are 50 to 80 percent higher than governments officially report. That gap translates into approximately 80 million tonnes of unaccounted methane entering the atmosphere each year. Because methane has more than 80 times the warming potency of carbon dioxide over a 20-year horizon, closing the reporting gap is not an academic exercise; it is a prerequisite for keeping the 1.5 °C target within reach.

Satellite-based detection has transformed this landscape. NASA's Earth Surface Mineral Dust Source Investigation (EMIT) instrument, mounted on the International Space Station, flagged more than 750 methane super-emitter events between August 2022 and late 2025 (NASA JPL, 2025). Meanwhile, the European Space Agency's TROPOMI sensor on Sentinel-5P has been mapping global methane concentrations at 5.5 km resolution since 2018, providing the longest continuous spaceborne methane dataset available. Together with commercial operators like GHGSat and MethaneSAT (launched March 2024), these instruments have created an unprecedented transparency layer that allows regulators, investors, and civil society to verify what companies and governments disclose.

Key Concepts

Super-emitters are individual facilities or infrastructure elements that release methane at rates exceeding 25 tonnes per hour. Despite representing a small fraction of total sources, super-emitters can account for 10 to 50 percent of a region's methane budget. Identifying and repairing them yields outsized climate benefits at comparatively low cost.

Imaging spectrometry is the technique EMIT and GHGSat use to detect methane plumes. By measuring sunlight reflected off the Earth's surface across hundreds of wavelengths, these instruments distinguish methane absorption signatures from background noise. EMIT achieves a detection threshold of roughly 5 tonnes per hour from orbit at 60-metre spatial resolution (NASA JPL, 2025).

Column-averaged dry-air mole fractions (XCH₄) are the standard metric TROPOMI reports. Expressed in parts per billion (ppb), XCH₄ values allow scientists to reconstruct regional emission fluxes through atmospheric inversion modelling. Global average XCH₄ crossed 1,920 ppb in 2024 (WMO, 2025), continuing a decade of accelerating growth.

Leak detection and repair (LDAR) programmes are the operational response to satellite detections. Operators dispatch ground crews or drones to confirm and fix the leaks satellites identify. The effectiveness of LDAR is measured by closure rate, the percentage of detected leaks repaired within a given timeframe.

The Data

The volume of satellite methane observations has grown exponentially. TROPOMI delivers approximately 800,000 methane soundings per day, covering virtually the entire globe every 24 hours (ESA, 2024). EMIT, though limited to the ISS orbit track, has identified more than 750 super-emitter events across 60-plus countries since its activation in August 2022 (NASA JPL, 2025). GHGSat, the leading commercial constellation, expanded to 12 satellites by January 2026 and reported over 4,500 individual facility-level detections during 2025 alone (GHGSat, 2026). MethaneSAT, operated by the Environmental Defense Fund, completed its commissioning phase in late 2024 and began publishing area-flux estimates for major oil and gas basins in early 2025, with a detection sensitivity below 100 kg per hour at 100-metre resolution (MethaneSAT, 2025).

Combining these datasets, the scientific community now has access to more than 10,000 individually catalogued methane point sources worldwide, up from fewer than 500 in 2020. This order-of-magnitude increase has exposed systematic under-reporting in national inventories submitted to the UNFCCC.

Trend Analysis

Three trends dominate the satellite methane record between 2022 and 2025.

First, global atmospheric methane concentrations continued rising. The WMO Greenhouse Gas Bulletin (WMO, 2025) reported that XCH₄ reached 1,923 ppb in 2024, an increase of 14 ppb over 2023 and the second-largest annual jump in the modern record. Early 2025 TROPOMI data suggest growth rates remained elevated through the first half of the year.

Second, the number of detected super-emitter events increased by roughly 40 percent year-on-year between 2023 and 2025. This rise is partly a function of improved detection capability (more satellites, better algorithms) but also reflects genuinely persistent emissions from facilities that remain unrepaired. EMIT data show that 22 percent of super-emitter plumes detected in 2023 were still active when re-observed in 2024 (NASA JPL, 2025), indicating slow closure rates in key regions.

Third, the fossil-fuel sector's share of detectable plumes has stabilized at roughly 60 percent of all point-source detections, with the remainder split between landfills (20 percent), agriculture (12 percent), and coal mining (8 percent) (IEA, 2024). However, within the fossil-fuel category, upstream oil and gas operations account for the vast majority, and flaring malfunctions, where gas intended for combustion is vented unburned, have emerged as a particularly underestimated source.

Regional Patterns

Turkmenistan remains the single largest national super-emitter hotspot identified by satellite. EMIT and GHGSat data consistently show large plumes emanating from compressor stations and gathering infrastructure in the Galkynysh gas field region. The IEA (2024) estimated Turkmenistan's oil and gas methane intensity at roughly 9 percent of marketed production, more than ten times the global average.

The US Permian Basin is the most intensively monitored region on Earth. GHGSat (2026) documented over 900 individual detections in the Permian during 2025. Despite strengthened EPA methane rules finalized in December 2023, leak rates in the basin remained between 2.5 and 3.5 percent of gross gas production through mid-2025, according to independent aerial surveys corroborating satellite findings (Alvarez et al., 2024).

Iraqi Kurdistan and parts of southern Iraq have shown persistent large plumes linked to associated gas venting at oil production sites. MethaneSAT area-flux estimates published in 2025 indicated that Iraq's Basra governorate emits approximately 1.8 million tonnes of methane annually, nearly double the country's UNFCCC submission.

Russia's Western Siberia continues to feature prominently in TROPOMI inversion analyses, though direct facility-level attribution is hampered by cloud cover and limited commercial satellite tasking over the region. Kayrros, a French analytics firm, estimated Russian upstream methane emissions at roughly 14 million tonnes in 2024, approximately 40 percent above the national inventory.

West Africa, particularly Nigeria's Niger Delta, and parts of Central Asia beyond Turkmenistan (notably Kazakhstan and Uzbekistan) round out the top hotspot regions, driven by ageing infrastructure, routine venting, and limited regulatory enforcement.

Sector-Specific KPI Benchmarks

What the Data Suggests

The satellite evidence points toward three actionable conclusions for policymakers and investors.

Closing the gap between inventories and satellite observations is now technically feasible but politically lagging. The instruments exist to verify every major oil and gas basin on Earth at weekly or better cadence. The bottleneck is not technology but institutional willingness to act on findings. Countries participating in the Global Methane Pledge (covering 155 signatories as of 2025) have committed to cutting methane 30 percent below 2020 levels by 2030, yet fewer than 30 have published implementation plans with measurable milestones (UNEP IMEO, 2025).

Financial materiality is growing. The EU Methane Regulation, which entered force in August 2024, requires importers of oil, gas, and coal to report upstream methane intensity by 2027 and comply with maximum intensity thresholds by 2030. Assets with high satellite-detected leak rates face stranded-asset risk and procurement exclusion. Investors managing over $12 trillion in assets have endorsed the Investor Methane Initiative's call for mandatory corporate methane disclosure (PRI, 2025).

Targeted abatement of the top 200 super-emitter sites identified by EMIT and GHGSat could eliminate an estimated 10 million tonnes of annual methane emissions at an average cost below $5 per tonne of CO₂-equivalent (IEA, 2024). This makes super-emitter repair among the cheapest climate mitigation options available anywhere in the economy.

Key Players

Established Leaders

• NASA JPL / EMIT — Operates the EMIT imaging spectrometer on the ISS; catalogued 750+ super-emitter events since 2022.
• European Space Agency / TROPOMI (Sentinel-5P) — Provides daily global methane mapping at 5.5 km resolution since 2018.
• GHGSat — Commercial satellite constellation with 12 satellites delivering facility-level methane detection at sub-25-metre resolution.
• International Energy Agency (IEA) — Publishes the Global Methane Tracker, the authoritative annual assessment of oil and gas methane emissions.

Emerging Startups

• MethaneSAT (EDF subsidiary) — Launched March 2024; delivers area-flux estimates at 100-metre resolution for entire basins, bridging the gap between TROPOMI and point-source sensors.
• Kayrros — French analytics firm using Sentinel and commercial imagery to produce near-real-time methane intelligence for asset managers and regulators.
• Orbital Sidekick — Deploying hyperspectral satellites for methane and other greenhouse-gas monitoring, targeting pipeline operators.
• Scepter Inc. — Developing next-generation geostationary methane sensors for continuous regional monitoring.

Key Investors/Funders

• Bezos Earth Fund — Provided $100M+ in grants supporting MethaneSAT development and UNEP's International Methane Emissions Observatory (IMEO).
• Bloomberg Philanthropies — Co-funds satellite data integration initiatives with UNEP and the Climate TRACE coalition.
• European Commission (Copernicus Programme) — Funds Sentinel-5P operations and the forthcoming CO2M mission, which will include methane detection capability.

Action Checklist

• Operators: Implement satellite-informed LDAR programmes targeting the highest-emitting facilities first; aim for closure rates above 90 percent within 90 days.
• Regulators: Require reconciliation of national inventories with satellite observations; adopt OGMP 2.0 Level 5 reporting as the regulatory baseline.
• Investors: Screen upstream oil and gas holdings against satellite methane intensity data; integrate EU Methane Regulation compliance risk into portfolio stress tests.
• Buyers of LNG and pipeline gas: Request supplier-specific methane intensity certificates verified by independent satellite analytics (GHGSat, Kayrros, or equivalent).
• Researchers: Contribute to open-data initiatives such as Climate TRACE and UNEP IMEO to improve detection algorithm accuracy and reduce false-positive rates.
• Civil society: Use publicly available EMIT and TROPOMI data to hold governments accountable for methane pledge implementation.

FAQ

How accurate are satellite methane detections compared with ground measurements? Satellite-detected emission rates agree with concurrent ground and aircraft measurements within 15 to 30 percent for large plumes above the detection threshold (Varon et al., 2024). For super-emitters exceeding 25 tonnes per hour, the agreement is typically better than 20 percent. Smaller sources below approximately 1 tonne per hour remain difficult to quantify from orbit, which is why ground-level surveys and drone-based inspections still play a complementary role.

Why are national methane inventories so inaccurate? Most national inventories rely on emission factors multiplied by activity data rather than direct measurements. These factors are often outdated, based on limited sampling, and fail to capture intermittent super-emitter events. The IEA (2024) documented that 90 percent of countries use Tier 1 IPCC methods with default factors, which systematically underestimate actual emissions from leaking infrastructure.

What is the business case for fixing methane leaks? Captured methane is saleable natural gas. The IEA (2024) estimates that 40 percent of oil and gas methane emissions could be eliminated at zero net cost because the value of captured gas exceeds repair expenses. For the remaining 60 percent, abatement costs average below $15 per tonne of CO₂-equivalent, making methane repair one of the most cost-effective climate interventions available.

Will satellite monitoring become mandatory? The EU Methane Regulation already mandates that importers provide satellite-verified methane data for fossil-fuel supply chains by 2027. The US EPA's finalized 2023 methane rules reference "advanced detection technologies" including satellites. While no jurisdiction yet requires universal satellite monitoring, regulatory trajectories in the EU, US, and Canada point strongly toward satellite-backed verification becoming the default standard by 2030.

How can developing countries benefit from satellite methane data? Open-access datasets from EMIT, TROPOMI, and MethaneSAT enable developing countries to build monitoring capacity without deploying expensive ground infrastructure. UNEP's IMEO provides technical assistance to help countries integrate satellite data into nationally determined contributions and access methane abatement finance through the World Bank's Global Gas Flaring Reduction Partnership.

Sources

• International Energy Agency. (2024). Global Methane Tracker 2024. Paris: IEA.
• NASA Jet Propulsion Laboratory. (2025). EMIT Methane Point Source Catalog: Three-Year Summary. Pasadena: NASA JPL.
• World Meteorological Organization. (2025). WMO Greenhouse Gas Bulletin No. 21. Geneva: WMO.
• European Space Agency. (2024). Sentinel-5P TROPOMI Methane Product: Performance and Validation Report. Noordwijk: ESA.
• GHGSat. (2026). Annual Methane Intelligence Report 2025. Montreal: GHGSat Inc.
• MethaneSAT. (2025). First Operational Results: Area-Flux Estimates for Major Oil and Gas Basins. Boulder: MethaneSAT LLC / Environmental Defense Fund.
• UNEP International Methane Emissions Observatory. (2025). Global Methane Assessment Update 2025. Nairobi: UNEP.
• Alvarez, R. A. et al. (2024). Persistent methane emissions in the US Permian Basin despite regulatory tightening. Environmental Science & Technology, 58(12), 5201-5213.
• Varon, D. J. et al. (2024). Satellite quantification of methane point sources: validation against aircraft surveys. Atmospheric Chemistry and Physics, 24(3), 1891-1908.
• Principles for Responsible Investment. (2025). Investor Expectations on Corporate Methane Management. London: PRI.