A method for controlling and regulating an internal combustion engine/generator system with a number of internal combustion engine/generator units which generate electric power and can be connected to a distribution network and load consumers which consume electric power, wherein a unit has a variable-speed internal combustion engine (401, 402, 404 - 408) and a generator (421 - 428), comprising the steps: (a) determining a current operating state (Z*) of the internal combustion engine (401, 402, 404 - 408) of the at least one internal combustion engine/generator unit; and (b) deriving an operating state range (ZB*) which describes a load application capability (L adm), dependent on the current operating state (Z*) for the internal combustion engine of the at least one internal combustion engine/generator unit, wherein the determining of the current operating state (Z*) and the deriving of the operating state range (ZB*) take place on the basis of a computational model for the internal combustion engine (401, 402, 405 - 408); (c) providing a load demand scope which describes possible load demands of the number of load consumers; and characterised in that (d) taking into account the current operating state (Z*) and the load application capability (L adm) of the internal combustion engine (401, 402, 404 - 408) of the at least one internal combustion engine/generator unit: - determining a number (#GENSET) of internal combustion engine/generator units which are to be connected to the distribution network, dependent on the load demand scope; and - determining a variable load distribution (L req) and/or a variable speed distribution (n req) for the number of internal combustion engines, dependent on the load demand scope. (a) determining a current operating state (Z*) of the internal combustion engine (401, 402, 404 - 408) of the at least one internal combustion engine/generator unit; and (b) deriving an operating state range (ZB*) which describes a load application capability (L adm), dependent on the current operating state (Z*) for the internal combustion engine of the at least one internal combustion engine/generator unit, wherein the determining of the current operating state (Z*) and the deriving of the operating state range (ZB*) take place on the basis of a computational model for the internal combustion engine (401, 402, 405 - 408); (c) providing a load demand scope which describes possible load demands of the number of load consumers; and characterised in that (d) taking into account the current operating state (Z*) and the load application capability (L adm) of the internal combustion engine (401, 402, 404 - 408) of the at least one internal combustion engine/generator unit: - determining a number (#GENSET) of internal combustion engine/generator units which are to be connected to the distribution network, dependent on the load demand scope; and - determining a variable load distribution (L req) and/or a variable speed distribution (n req) for the number of internal combustion engines, dependent on the load demand scope. - determining a number (#GENSET) of internal combustion engine/generator units which are to be connected to the distribution network, dependent on the load demand scope; and - determining a variable load distribution (L req) and/or a variable speed distribution (n req) for the number of internal combustion engines, dependent on the load demand scope.