Assessment of national carbon dioxide emission factors for the Lithuanian fuel combustion sector

This paper aims at deriving country-specific CO2 emission factors for fuels combusted in the Lithuanian energy sector. Rigorously assessed country-specific CO2 emission factors will contribute to accurate and reliable estimates of CO2 emissions. The paper presents the methods applied to derive country-specific CO2 emission factors together with their recommended values and uncertainties for various types of fuels. Analysis of the data provided by the plant operators participating under the European Union emission trading system and aggregation of the measurements results of the accredited research laboratories allowed to determine country-specific CO2 emission factors for the different types of fuels. Uncertainties of recommended CO2 emission factors were derived at a fuel type-specific level. It was set that recommended values of CO2 emission factors are within the uncertainty range of the IPCC default values. The application of determined country-specific CO2 emission factors in the Lithuanian energy sector increases accuracy and decreases uncertainty of the national greenhouse gas inventory.