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The addition of carbon dioxide to the gasification media during lignite gasification is introduced. The paper presents thermodynamic grounds of CO enhanced gasification using a simplified equilibrium model. Experimental tests conducted using a pilot-scale circulating fluidized bed gasifier are discussed. Detailed analysis of the CO/C ratio on process conditions, namely on the process gas composition, lower heating value and H/CO ratio, is provided. Process gas composition implies that the gas is suitable for heat and power generation. Alternatively, CO enhanced gasification could be considered as a carbon capture and utilization technology when external, renewable heat supply to the process is used. The results thus obtained are the initial step toward development of the CO enhanced gasification process. [ABSTRACT FROM AUTHOR]