A micro-cogenerator comprising: a pyrolytic gasifier adapted to produce syngas and biochar from a renewable and sustainable energy source, preferably woody biomass, a burner adapted to receive the syngas produced by said pyrolytic gasifier and to generate hot combustion gases, a Stirling engine comprising a heat exchanger fed with said hot combustion gases, said Stirling engine being adapted to generate electric energy, wherein said pyrolytic gasifier comprises a reaction chamber inside which said energy source is gasified in the presence of air, thus generating syngas and biochar, characterized in that said reaction chamber has truncated-cone shape and is made of a polycrystalline alumina fiber-based material comprising at least 70% by weight of polycrystalline alumina and, optionally, at least 5% by weight of silica, said material having a density preferably between 350 and 500 kg/m 3, said micro-cogenerator comprising an exhaust system adapted to receive exhaust fumes leaving the heat exchanger of the Stirling engine, wherein said exhaust system comprises an exchanger for the recovery of heat from said exhaust fumes, a lambda probe which provides a signal based on which the ratio of air to syngas at the burner inlet is adjusted, and a thermocouple which measures the temperature of said exhaust fumes, said micro-cogenerator further comprising an extraction fan connected to said exchanger for the recovery of heat from the exhaust fumes, said extraction fan is configured to extract the exhaust fumes thus creating a vacuum inside the burner and the pyrolytic gasifier and, in turn, to adjust the inflow of the syngas from the pyrolytic gasifier to the burner and the inflows of air into both the pyrolytic gasifier and the burner. a pyrolytic gasifier adapted to produce syngas and biochar from a renewable and sustainable energy source, preferably woody biomass, a burner adapted to receive the syngas produced by said pyrolytic gasifier and to generate hot combustion gases, a Stirling engine comprising a heat exchanger fed with said hot combustion gases, said Stirling engine being adapted to generate electric energy, wherein said pyrolytic gasifier comprises a reaction chamber inside which said energy source is gasified in the presence of air, thus generating syngas and biochar, characterized in that said reaction chamber has truncated-cone shape and is made of a polycrystalline alumina fiber-based material comprising at least 70% by weight of polycrystalline alumina and, optionally, at least 5% by weight of silica, said material having a density preferably between 350 and 500 kg/m 3, said micro-cogenerator comprising an exhaust system adapted to receive exhaust fumes leaving the heat exchanger of the Stirling engine, wherein said exhaust system comprises an exchanger for the recovery of heat from said exhaust fumes, a lambda probe which provides a signal based on which the ratio of air to syngas at the burner inlet is adjusted, and a thermocouple which measures the temperature of said exhaust fumes, said micro-cogenerator further comprising an extraction fan connected to said exchanger for the recovery of heat from the exhaust fumes, said extraction fan is configured to extract the exhaust fumes thus creating a vacuum inside the burner and the pyrolytic gasifier and, in turn, to adjust the inflow of the syngas from the pyrolytic gasifier to the burner and the inflows of air into both the pyrolytic gasifier and the burner.