Method for operating a system which has: - a cryogenic, in particular superconductive, electric machine with a multiplicity of components , 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 , wherein the heating device is a separate device and/or the second cooling system , wherein the removed additional coolant is fed to the heating device 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 , 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 , wherein the heating device is a separate device and/or the second cooling system , wherein the removed additional coolant is fed to the heating device and heats the coolant which is fed to it, and - the heated coolant is provided as an additional operating medium to the consumer . <EOS>