TANGO: Image by ISISpace
In mid‑July 2025, the Dutch consortium of ISISPACE, TNO, SRON, and KNMI officially launched the development of TANGO (Twin Anthropogenic Greenhouse‑gas Observers). These twin satellites are designed to precisely detect and monitor greenhouse gas emissions from individual sources across the globe. Scheduled for launch in 2027, the mission positions the Netherlands at the forefront of space-based climate intelligence.
The TANGO Misson
Unlike most Earth-observation missions that provide wide-scale atmospheric data, TANGO is designed to zoom in. The mission consists of two satellites that will fly in tandem, just a few hundred meters apart, and will deliver highly detailed measurements of carbon dioxide (CO₂), methane (CH₄), and nitrogen oxides (NOₓ) at resolutions of around 300 by 300 meters. This resolution is fine enough to distinguish emissions from individual industrial facilities such as power plants, factories, and waste processing sites.
This capability marks a step-change from current European satellites. ESA’s Sentinel-5P with the TROPOMI instrument (also a Dutch contribution) currently maps only about 5% of human-made emissions globally. TANGO, in contrast, will cover up to 70%, and with greater spatial accuracy. The mission will offer a powerful new tool for countries, including the Netherlands, to independently verify whether emissions targets are being met, and to strengthen environmental oversight.
Space Innovation from the Aerospace Delta
The role of space stakeholders from the Zuid-Holland region in the TANGO mission highlights its strength as a national hub for space innovation. ISISPACE, headquartered in Delft, serves as prime contractor, overseeing satellite integration, launch, and mission control. TNO’s contribution is the design and production of the twin Spectrolite instruments, compact sensors capable of detecting CO₂, CH₄, and NO₂ from a nanosatellite platform and contributing to a greenhouse-gas atlas.
The scientific heart of the mission is led by SRON Netherlands Institute for Space Research, headquartered in Leiden and Groningen, and the Royal Netherlands Meteorological Institute (KNMI). These partners are responsible for processing the satellite data and developing the gas retrieval algorithms.
Serving Dutch Climate Goals and Space Leadership
Beyond its technical achievements, TANGO will provide the Netherlands with a strategic asset for implementing and enforcing climate policy. The satellites will allow for facility-level emissions tracking, providing independent verification of greenhouse gas outputs. This data will support Dutch and European policymakers in monitoring progress toward climate targets and holding emitters accountable, especially as regulations tighten and emissions reporting becomes increasingly critical to environmental governance.
TANGO’s “open data policy” also supports transparency and accountability, enabling scientific institutions to evaluate and monitor emissions at a much finer scale than previously. Furthermore, the mission complements larger EU efforts like the Copernicus CO₂ Monitoring mission (CO2M), scheduled for launch in 2026. While CO2M will offer broader coverage, TANGO’s higher-resolution targeting makes it ideal for zooming in on specific emitters. Together, these missions create a layered European monitoring system and ensure that the Netherlands continues to play a leading role in Europe’s climate response.
In the years ahead, the capabilities developed for TANGO, especially TNO’s Spectrolite technology, may be used in follow-up missions or integrated into broader international partnerships. The Dutch space sector sees this mission not only as a one-off success, but as a launchpad for new services, technologies, and export opportunities in the global climate and Earth observation markets.
For Aerospace Delta and its partners, the mission highlights how regional excellence in satellite development, optical instrumentation, and data science can scale into national value and international leadership.
You can find more information and follow the development of the TANGO mission at the webpages of the official partners: TNO, SRON, ISISpace, KNMI.
