Method of utilizing the waste heat of a plant for producing cement, - where the plant for producing cement has at least one heat exchanger consisting of a sequence of cyclones (1a, 1b, 2, 3) for heating raw meal, at least one calciner (4, 5) for deacidifying the raw meal, at least one rotary tube furnace for sintering the deacidified raw meal to form cement clinker having a rotary furnace inlet chamber, at least one clinker cooler for cooling the cement clinker and at least one tertiary air conduit for discharging heated cooler air (tertiary air) from the clinker cooler into the at least one calciner, and - where process gas is taken off at a process gas offtake at the outlet of the calciner and/or at a process gas offtake at the gas-side outlet of the first cyclone in the flow direction of gas in the heat exchanger and/or at a process gas offtake at the rotary furnace inlet chamber, is fed to a first steam boiler, the bypass boiler, for heat exchange and for heating of steam for the purpose of a subsequent conversion of heat into electric energy, and is then recirculated to the second or third cyclone (1a, 2) in the flow direction of gas of the heat exchanger, characterized by - taking off of hot tertiary air from the tertiary air conduit and introduction of the tertiary air into a second steam boiler, the tertiary air boiler, for heat exchange and for heating of steam, - introduction of the heated steam from the tertiary air boiler into the bypass boiler for further heating, - recirculation of the proportion of tertiary air which has passed through the tertiary air boiler into the tertiary air conduit at a tertiary air recirculation point between tertiary air boiler and calciner (4, 5), - conveying of the hot exhaust gas from the cyclone heat exchanger through a steam boiler, the suspension preheater boiler (SP boiler), located downstream of the cyclone heat exchanger in the flow direction of gas, for heat exchange and for heating of steam, - conveying of the hot exhaust air from the zone located at the end, in the flow direction of material, of the clinker cooler through a steam boiler, the air quenched clinker cooler boiler (AQC boiler), for heat exchange and for heating of steam, and - conveying of the heated steam from the SP boiler into the bypass boiler for further heating and of the heated steam from the AQC boiler into the tertiary air boiler for further heating, or conveying of the heated steam from the SP boiler into the tertiary air boiler and of the heated steam from the AQC boiler into the bypass boiler. - where the plant for producing cement has at least one heat exchanger consisting of a sequence of cyclones (1a, 1b, 2, 3) for heating raw meal, at least one calciner (4, 5) for deacidifying the raw meal, at least one rotary tube furnace for sintering the deacidified raw meal to form cement clinker having a rotary furnace inlet chamber, at least one clinker cooler for cooling the cement clinker and at least one tertiary air conduit for discharging heated cooler air (tertiary air) from the clinker cooler into the at least one calciner, and - where process gas is taken off at a process gas offtake at the outlet of the calciner and/or at a process gas offtake at the gas-side outlet of the first cyclone in the flow direction of gas in the heat exchanger and/or at a process gas offtake at the rotary furnace inlet chamber, is fed to a first steam boiler, the bypass boiler, for heat exchange and for heating of steam for the purpose of a subsequent conversion of heat into electric energy, and is then recirculated to the second or third cyclone (1a, 2) in the flow direction of gas of the heat exchanger, - taking off of hot tertiary air from the tertiary air conduit and introduction of the tertiary air into a second steam boiler, the tertiary air boiler, for heat exchange and for heating of steam, - introduction of the heated steam from the tertiary air boiler into the bypass boiler for further heating, - recirculation of the proportion of tertiary air which has passed through the tertiary air boiler into the tertiary air conduit at a tertiary air recirculation point between tertiary air boiler and calciner (4, 5), - conveying of the hot exhaust gas from the cyclone heat exchanger through a steam boiler, the suspension preheater boiler (SP boiler), located downstream of the cyclone heat exchanger in the flow direction of gas, for heat exchange and for heating of steam, - conveying of the hot exhaust air from the zone located at the end, in the flow direction of material, of the clinker cooler through a steam boiler, the air quenched clinker cooler boiler (AQC boiler), for heat exchange and for heating of steam, and - conveying of the heated steam from the SP boiler into the bypass boiler for further heating and of the heated steam from the AQC boiler into the tertiary air boiler for further heating, or conveying of the heated steam from the SP boiler into the tertiary air boiler and of the heated steam from the AQC boiler into the bypass boiler.