Spark ignition (SI) engines remain the core of power generation facilities suitable for number of small scale applications. In past few years, strong emphasis has been put on reductions of emissions coming from them, especially considering their impact to the carbon footprint. The turn from fossils into renewable gaseous fuels, as organic digestion products, stated one of widely implemented solutions, introduced to minimize negative impact of spark ignition engine-based facilities on the environment. Nevertheless, increasing awareness on climate protection induces next steps to prevent further CO2 emissions. In this paper, a novel hybrid approach, concerning reduction of CO2 emissions from stationary SI-engine power systems, is presented. The approach links activities for decarbonization of fuel by its enrichment with hydrogen within the reasonable limits, as well as application of advanced membrane separation, equipped with thermoacoustic moisture removal, for final exhaust gases treatment. Results of initial analysis suggest possibility of increasing its ecological parameters, as the recovery coefficient of the membrane separation unit, at the level of 0.5%. The internal energy consumption of the applied set of thermoacoustic units corresponds to 0.5-0.6% of the analyzed system's power output.