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The GHGSat launched the first commercial CO2 sensor in orbit in November 2023. The GHGSat C10 Vanguard sensor is the precursor of a new generation of space instruments that will build on GHGSat experience with methane emissions. Its optical design is similar to the methane infrared sensors already in orbit but tuned to CO2's characteristic wavelengths. GHGSat-C10 Vanguard and future constellations will provide frequent, accurate and independent high-resolution CO2 data from individual industrial sites that will help in addressing carbon dioxide emissions, reporting and trading. The onboard instrument is a wide-angle Fabry-Perot (WAF-P) imaging spectrometer that measures CO2 concentrations by collecting and spectrally filtering solar backscattered radiation in the shortwave infrared (SWIR). In this technical note are reported methods and results of GHGSat L4 CO2 emissions rate data analysis and the validation against the reference data. The first GHGSat CO2 dataset delivered was made of 220 acquisitions over U.S. known power plants, categorized as 33 emissions detected, 6 probably detected, and 181 not detected. Data were validated using the Clean Air Markets Program Data from U.S. EPA. A second dataset from GHGSat was requested covering the European region and added to the analysis. 16 observations received with only 1 emission detected that was incorporated in the analysis. The reference CO2 emission rate data used for the European acquisition was calculated applying a tailored conversion coefficient to the power plant energy generated.