| Summary: | Combined heat and power systems dedicated to micro-scale applications are currently increasing in popularity. The use of such systems is beneficial from the standpoint of increasing the usage of renewable energy, increasing energy efficiency and reducing CO<sub>2</sub> emissions into the atmosphere. This paper shows two examples of prototypical micro-cogeneration systems powered by biomass. In the first, smaller one, electricity is generated in thermoelectric generators using heat from the wood-fired stove. The second one is equipped with a 100 kW<sub>t</sub> batch boiler and operates according to a modified Rankine cycle. The energy and ecological analysis were conducted and discussed, including selected aspects of heat and power generation and gaseous pollutant emission. Measurements were performed using a dedicated control and measurement station with a PLC controller. As was shown, thermoelectric generators operated respectively with the power of 22.5 W<sub>e</sub> in the case of the air-cooled unit and 31.2 W<sub>e</sub> in the case of the water-cooled unit. On the other hand, the maximum power level of ca. 1145 W<sub>e</sub> was obtained in the system with a batch boiler operating according to a modified Rankine cycle. The ecological analysis showed that the average amount of CO emission during the wood combustion in the tested stove was 1916 mg/m<sup>3</sup> (in the combustion phase). In the case of straw combustion, it was characterized by lower CO<sub>2</sub> emissions compared to coal, but higher CO<sub>2</sub> emissions compared to gasoline and natural gas. Based on the obtained results, some outlines for the systems development were given.
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