A combined heat and power system, the CHP system comprising: a combustion system having a combustion chamber and a feed mechanism configured to feed solid fuel into the combustion chamber, the combustion chamber having a gas inlet for combustion and a combustion gas exhaust, wherein the combustion chamber is configured to receive an expanded heated secondary gas to the combustion air inlet for combustion of the solid fuel; a proportional valve operably coupled in series with the gas inlet and operable to control the flow of the heated expanded secondary gas thereto; an exhaust plenum operatively connected to the combustion chamber and configured to receive high temperature combustion gases therefrom, the exhaust plenum including a secondary gas port operable to direct the expanded heated secondary gas to the exhaust plenum for mixing with the high temperature combustion gases; a high temperature heat exchanger operably coupled to the exhaust plenum and configured to receive the mixed combustion gases therefrom, the high temperature heat exchanger operable to transfer heat from the mixed combustion gases to a compressed secondary gas; a gas turbine having a compression section and an expansion section operably connected on a drive shaft, the gas turbine configured to receive a secondary gas at an inlet to the compression section and compress the secondary gas and to direct the compressed secondary gas to an inlet of the high temperature heat exchanger, the gas turbine configured to receive a heated compressed secondary gas at an inlet to the expansion section to expand the heated compressed secondary gas and generate work therefrom, wherein an output of the expansion section of the gas turbine is operably coupled to the secondary gas port of the exhaust plenum and the combustion inlet of the combustion chamber, such that in operation the secondary gas port and the combustion inlet receive the expanded heated secondary gas; and a generator operably connected to the drive shaft of the gas turbine and configured to generate electricity with the work generated therein. a combustion system having a combustion chamber and a feed mechanism configured to feed solid fuel into the combustion chamber, the combustion chamber having a gas inlet for combustion and a combustion gas exhaust, wherein the combustion chamber is configured to receive an expanded heated secondary gas to the combustion air inlet for combustion of the solid fuel; a proportional valve operably coupled in series with the gas inlet and operable to control the flow of the heated expanded secondary gas thereto; an exhaust plenum operatively connected to the combustion chamber and configured to receive high temperature combustion gases therefrom, the exhaust plenum including a secondary gas port operable to direct the expanded heated secondary gas to the exhaust plenum for mixing with the high temperature combustion gases; a high temperature heat exchanger operably coupled to the exhaust plenum and configured to receive the mixed combustion gases therefrom, the high temperature heat exchanger operable to transfer heat from the mixed combustion gases to a compressed secondary gas; a gas turbine having a compression section and an expansion section operably connected on a drive shaft, the gas turbine configured to receive a secondary gas at an inlet to the compression section and compress the secondary gas and to direct the compressed secondary gas to an inlet of the high temperature heat exchanger, the gas turbine configured to receive a heated compressed secondary gas at an inlet to the expansion section to expand the heated compressed secondary gas and generate work therefrom, wherein an output of the expansion section of the gas turbine is operably coupled to the secondary gas port of the exhaust plenum and the combustion inlet of the combustion chamber, such that in operation the secondary gas port and the combustion inlet receive the expanded heated secondary gas; and a generator operably connected to the drive shaft of the gas turbine and configured to generate electricity with the work generated therein.