Blind test finds methane satellites detect most clear-sky plumes
Dedicated methane-sensing satellites detected 92–100% of test plumes on clear days in a Stanford-led blind experiment reported on October 14.
Published October 18, 2026Briefs / Frontier Tech / Experimental Systems
Dedicated methane-sensing satellites detected 92–100% of test plumes on clear days in a Stanford-led blind experiment reported on October 14. Researchers timed 481 controlled methane releases in Casa Grande, Arizona, to passes by 11 satellites during 2025. Fifteen teams independently analyzed the observations.
The results, published in Nature, provide a practical benchmark for finding large leaks. Under favorable conditions, dedicated instruments reliably detected releases of roughly 50–200 kilograms per hour, depending on the system. Most estimates of emission amounts were within about 50% above or below the actual releases.
Performance depended strongly on the equipment and conditions. Repurposed sensors detected 62–88% of clear-sky plumes, while general-purpose land scanners detected 29–37%. Clouds remained a problem even for dedicated instruments.
The desert experiment supports using satellites to flag leaks for investigation, while leaving important questions about performance over other terrain, open water and cloudier regions. Detection accuracy should not be confused with precise measurement of every leak.