MethaneSAT's Posthumous Data Dump Reveals Oil and Gas Methane Emissions 50 Percent Higher Than Official Estimates, Triggering Senate Investigation
Data from the now-silent MethaneSAT satellite shows global oil and gas methane emissions far exceed inventories, prompting a U.S. Senate probe into Permian Basin operators.
Overview
The Environmental Defense Fund’s MethaneSAT satellite fell silent in mid-2025 after barely a year in orbit, but the data it transmitted before losing contact is now reshaping the global picture of fossil fuel methane pollution. A first-of-its-kind global assessment released in February 2026 found that methane emissions from oil and gas operations across 45 producing regions are roughly 50 percent higher than what governments and industry report in official inventories, according to Inside Climate News. The findings have already prompted a U.S. Senate investigation into emissions discrepancies in the Permian Basin, the country’s most productive oil field.
What We Know
MethaneSAT collected measurements from May 2024 to June 2025, covering 45 oil and gas producing regions that account for roughly half of the world’s onshore production. The initial assessment, released on February 2, 2026, paints a stark picture of underreported emissions:
- Overall, methane emissions observed by the satellite were approximately 50 percent higher than figures in the widely cited Emissions Database for Global Atmospheric Research and the U.S. EPA’s Greenhouse Gas Inventory, as reported by Inside Climate News.
- In the Permian Basin of West Texas and southeast New Mexico, emissions reached an estimated 410 metric tons per hour, roughly four times the EPA’s official estimates.
- Basins where natural gas accounts for 20 percent or more of energy produced showed absolute emissions three times higher than reported in global inventories.
- The Widyan Basin in Iraq registered a methane intensity above 20 percent of marketed gas production, while the Appalachian Basin in the eastern United States measured 0.6 percent.
The data also highlighted striking regulatory contrasts within the same geological formation. On the New Mexico side of the Delaware Basin, where state regulations took effect in 2021, MethaneSAT observed methane intensity of approximately 1.2 percent. On the Texas side, which lacks comparable rules, the figure was roughly 3.1 percent, according to Inside Climate News.
Steven Hamburg, EDF’s chief scientist and MethaneSAT project lead, said the data underscores the need for empirical monitoring: “We really need that kind of dynamic, empirical data to really make the situation clear and reward those who are doing well and call out those who are not.”
Senate Investigation
The satellite’s revelations have moved beyond the scientific sphere and into the political arena. On March 19, 2026, Senator Sheldon Whitehouse (D-RI) launched an investigation into methane pollution in the Permian Basin, writing to eight major operators including ExxonMobil, Chevron, ConocoPhillips, Occidental Petroleum, Diamondback Energy, Devon Energy, EOG Resources, and Mewbourne Oil Company, as reported by Inside Climate News.
Whitehouse noted that “significant, previously unreported emissions may be occurring,” presenting opportunities to both enhance operational efficiency and combat climate change. The investigation comes as the industry faces growing scrutiny over the gap between its public pledges and observed performance. Some 56 major oil and gas companies signed the Oil and Gas Decarbonization Charter, pledging to reduce methane intensity to 0.2 percent by 2030. Yet MethaneSAT’s data shows even the lowest-emitting basins release methane at rates several times above that target, according to Inside Climate News.
The Broader Satellite Monitoring Landscape
MethaneSAT’s contribution arrives at a moment of rapid expansion in the methane-monitoring satellite sector. Montreal-based GHGSat, which operates the world’s largest commercial constellation dedicated to greenhouse gas monitoring, announced plans to nearly double its fleet from 12 to 21 satellites by the end of 2026, according to SpaceNews. GHGSat’s satellites offer complementary capabilities, pinpointing emissions down to individual pieces of equipment, while MethaneSAT was designed to scan wider areas and detect smaller, dispersed sources that collectively represent a significant share of total regional emissions.
Other entrants include Germany’s Airmo, which has partnered with EnduroSat to deploy a 12-satellite constellation starting in 2027, and Carbon Mapper, whose Tanager-1 satellite has already released over 300 initial detections of methane and carbon dioxide super-emitters across six continents.
What We Don’t Know
The MethaneSAT data remains awaiting formal peer review, a process that could refine or qualify some of its headline findings. The satellite’s loss of contact in mid-2025 also means no new observations are being collected, leaving a temporal gap that other instruments must fill. It remains unclear whether the EPA or other national agencies will revise their inventory methodologies in light of the satellite evidence, or whether the Senate investigation will lead to regulatory action.
The aggregate 1.6 percent methane loss rate observed across key basins, while significantly above industry targets, does not distinguish between intentional venting, unintentional leaks, and incomplete flaring, a breakdown that would be necessary to design effective mitigation strategies.