In this article environmental and economic impact of firing oil shale of higher quality is analyzed. Fuel consumption, emission indicators (CO 2 , SO 2 , CO, NO x , N 2 O, particulates) and ash mass flow of a circulating fluidized bed (CFB) boiler firing oil shale of lower heating value (LHV) of 8.2-11.5 MJ/kg are presented. The investigation is based on full-scale firing tests. Based on test results the impact of transportation and operational costs of oil shale and ash handling on electricity

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... price is analyzed. The pollution charges and CO 2 emission allowances are considered when analyzing the environmental impact on costs. Firing upgraded oil shale (10.5 MJ/kg) leads to substantial reduction of environmental impact and enables to save costs of electricity production. Reduction of CO 2 emission by 7%, ash mass flow by 25% and fuel consumption by 22% when firing upgraded oil shale instead of conventional one (8.4 MJ/kg) enables to save up to 3 EUR/MWh e , achieving the major savings from environmental costs, especially from reduced need for purchasing CO 2 emission allowances.