A redundant electric power supply system for a vehicle, comprising - a main power supply for providing electric power for operating the vehicle; - a supplementary power supply including at least one supplementary power unit dedicated as backup power supply for at least one safety relevant vehicle component, wherein the main power supply is adapted to provide power for the safety relevant vehicle components and other vehicle components, and wherein the supplementary power supply is adapted to provide backup power only for the safety relevant vehicle component in case of a failure in the main power supply, characterized by: a management unit for the main power supply configured to monitor the main power supply and to provide information indicating a load status of the main power supply, the management unit being configured to issue a signal if the main power supply is not able to provide sufficient energy for maintaining all functions; and a management unit for monitoring the supplementary power unit, the management unit being configured to provide load information indicating a remaining capacity for performing maneuvers including brake actions and/or steering actions, wherein both management units (25, 35) are adapted to communicate with each other to exchange information about the failure, the signal of the management unit being forwarded to the management unit of the supplemental power supply and, in response thereto, the supplemental power supply is configured to provide backup power to the safety relevant component to ensure correct operations of this component,. - a main power supply for providing electric power for operating the vehicle; - a supplementary power supply including at least one supplementary power unit dedicated as backup power supply for at least one safety relevant vehicle component, wherein the main power supply is adapted to provide power for the safety relevant vehicle components and other vehicle components, and wherein the supplementary power supply is adapted to provide backup power only for the safety relevant vehicle component in case of a failure in the main power supply, characterized by: a management unit for the main power supply configured to monitor the main power supply and to provide information indicating a load status of the main power supply, the management unit being configured to issue a signal if the main power supply is not able to provide sufficient energy for maintaining all functions; and a management unit for monitoring the supplementary power unit, the management unit being configured to provide load information indicating a remaining capacity for performing maneuvers including brake actions and/or steering actions, wherein both management units (25, 35) are adapted to communicate with each other to exchange information about the failure, the signal of the management unit being forwarded to the management unit of the supplemental power supply and, in response thereto, the supplemental power supply is configured to provide backup power to the safety relevant component to ensure correct operations of this component,. a management unit for the main power supply configured to monitor the main power supply and to provide information indicating a load status of the main power supply, the management unit being configured to issue a signal if the main power supply is not able to provide sufficient energy for maintaining all functions; and a management unit for monitoring the supplementary power unit, the management unit being configured to provide load information indicating a remaining capacity for performing maneuvers including brake actions and/or steering actions, wherein both management units (25, 35) are adapted to communicate with each other to exchange information about the failure, the signal of the management unit being forwarded to the management unit of the supplemental power supply and, in response thereto, the supplemental power supply is configured to provide backup power to the safety relevant component to ensure correct operations of this component,.