Method for operating a system which has: - a cryogenic, in particular superconductive, electric machine with a multiplicity of components (111, 121), comprising at least one cryogenic component and a first cooling system which is assigned to the cryogenic component, and at least one further component and a second cooling system which is assigned to the further component, and - a consumer which is configured to convert an operating medium, wherein - a cryogenic coolant is fed out of a reservoir in a liquid state to the first cooling system and the cryogenic component of the electric machine, in order to cool the cryogenic component to a cryogenic temperature, wherein at least part of the coolant evaporates, - the coolant is subsequently fed completely or at least predominantly in a gaseous state to the second cooling system and the further component of the electric machine, in order to cool the further component, in particular, to an operating temperature which is lowered in comparison with a normal temperature, with utilization of a remaining cooling capability of the coolant, and - the coolant is subsequently provided by the electric machine to the consumer, wherein the consumer uses the coolant which is fed to it as operating medium, characterized in that operating medium is additionally fed to the consumer, wherein, in order to provide an additional operating medium, - additional coolant is removed from the reservoir, - the removed additional coolant is fed to a bypass which provides bypassing of the cryogenic component and the first cooling system, wherein the bypass has a heating device (510, 150), wherein the heating device (510, 150) is a separate device and/or the second cooling system, wherein the removed additional coolant is fed to the heating device (510, 150) and heats the coolant which is fed to it, and - the heated coolant is provided as an additional operating medium to the consumer. - a cryogenic, in particular superconductive, electric machine with a multiplicity of components (111, 121), comprising at least one cryogenic component and a first cooling system which is assigned to the cryogenic component, and at least one further component and a second cooling system which is assigned to the further component, and - a consumer which is configured to convert an operating medium, wherein - a cryogenic coolant is fed out of a reservoir in a liquid state to the first cooling system and the cryogenic component of the electric machine, in order to cool the cryogenic component to a cryogenic temperature, wherein at least part of the coolant evaporates, - the coolant is subsequently fed completely or at least predominantly in a gaseous state to the second cooling system and the further component of the electric machine, in order to cool the further component, in particular, to an operating temperature which is lowered in comparison with a normal temperature, with utilization of a remaining cooling capability of the coolant, and - the coolant is subsequently provided by the electric machine to the consumer, wherein the consumer uses the coolant which is fed to it as operating medium, characterized in that operating medium is additionally fed to the consumer, wherein, in order to provide an additional operating medium, - additional coolant is removed from the reservoir, - the removed additional coolant is fed to a bypass which provides bypassing of the cryogenic component and the first cooling system, wherein the bypass has a heating device (510, 150), wherein the heating device (510, 150) is a separate device and/or the second cooling system, wherein the removed additional coolant is fed to the heating device (510, 150) and heats the coolant which is fed to it, and - the heated coolant is provided as an additional operating medium to the consumer.