The investigation into the loss of MethaneSAT has narrowed the failure to the spacecraft’s avionics or electrical power system, but the precise cause remains unknown. For the Earth observation sector, the findings underline the importance of resilient spacecraft design, diagnostic visibility and continuity planning for decision-critical data services.

MethaneSAT lost communication on 20 June 2025 following a ground-station pass during which communications and spacecraft health data appeared normal. According to the mission’s anomaly investigation report, operators spent 21 days trying to restore contact and made nearly 400 communication attempts without success.

Optical images of the spacecraft were obtained on 28 June, 4 July and 16 July. They showed MethaneSAT intact, with no visible damage or nearby debris, but not in its normal orientation. The mission was subsequently declared over and a formal investigation began.

Failure narrowed to two critical subsystems

The investigation used information from 15 months of operations, pre-launch testing and reviews by independent technical experts. With no telemetry available after the anomaly, the team could identify likely failure paths but could not establish a definitive root cause.

Investigators concluded that a solitary event either began within, or spread to, one of two areas: the flight avionics unit or the electrical power subsystem. A disruption in either could explain the off-nominal orientation and loss of communication.

Three possible contributors were identified: a printed circuit board failure within the spacecraft bus avionics, an electronic component or circuit board failure at a spacecraft bus interface or a thruster-related failure that sent high current into other bus subsystems. The available evidence was insufficient to rank their likelihood.

Micrometeoroid or debris damage, a destructive radiation event, electrostatic effects, a communications error between subsystems and unexpected fault-system interactions were assessed as significantly less likely, although they could not be eliminated completely.

A lasting data asset

The end of spacecraft operations did not end the value of the mission. MethaneSAT was designed to quantify both concentrated sources and smaller, dispersed emissions across major oil and gas regions. Its particular contribution was a system-wide view that could reveal emissions missed when monitoring focuses only on large individual leaks.

A MethaneSAT review of 2025 says the mission collected data over 41 oil and gas basins in 25 countries, covering half of global onshore oil and gas production. By the end of that year, nearly 800 technical users had been granted access through Google platforms and close to 2,000 files had been made available.

The existing catalogue remains accessible through the MethaneSAT web portal, Google Earth Engine and Google Cloud. Further processing and analysis continue to turn the archived observations into evidence for emissions reduction.

Lessons for commercial Earth observation

MethaneSAT’s investigation is relevant beyond one mission. When a spacecraft stops communicating without first transmitting fault data, the evidence needed for diagnosis can disappear at the same moment as the service itself. Redundant communications, power isolation, fault containment and recoverable safe modes therefore have commercial as well as engineering value.

The use of independent on-orbit imagery also demonstrates the growing role of space-domain awareness services in anomaly investigation. External observation could not identify the failed component, but it established that the spacecraft remained intact and was incorrectly oriented, materially narrowing the investigation.

For customers using EO intelligence in regulation, investment or operational decisions, continuity cannot depend entirely on a single instrument. Blending archived observations with aircraft campaigns, other satellites and common analytics can preserve part of the service while replacement options are assessed. MethaneSAT says those options include aircraft measurements, applying its analytics to other satellite data and potentially building a new spacecraft.

The central outcome is not simply that a mission was lost. MethaneSAT proved demand for transparent, basin-scale methane intelligence and created data, algorithms and scientific knowledge that remain useful. The commercial challenge now is to make that capability more resilient, repeatable and less dependent on any single point of failure.

Primary source: Results of the Anomaly Investigation into the Loss of Communication with MethaneSAT, published by MethaneSAT on 6 November 2025.