The conversion of CO2 and (CH4 + CO2) mixtul es to CO, at room temperature and atmospheric pressure conditions, in pulsed corona discharges, was investigated. Conversion of pure CO2 was 16.8% at 10 cm(3)-min(-1) flow rate, which corresponds to 75 mu nol-min(-1) rate of conversion. The CO2 conversion was improved to 38% (85 mu unol-min(-1) by feeding the reactor with CH4 + CO2 gas mixture (I:I ratio), simultaneously with CH4 conversion of 46% (similar to 102.7 mu mol-min(-1)) at 10 cm(3)-min(-1) flow rate of feed gases and 9 W power conditions. Rate of CO production is increased from similar to 110 to similar to 180 mu mol-min(-1) with the variation of feed gas (CH4 + CO2 mixture, I:I ratio) sow rate from 10 to 40 cm(3)-min(-1) at 9W, which corresponds to energy efficiency of 2.5 to 4.1%. Highest energy yield of 25g/kWh for CH4 conversion, 29 g/k Wh for CO2 conversion, and 33 g/kWh for CO production were achieved.