Energy management system in a vehicle and a method thereof

An energy management system (100) in a vehicle, said vehicle comprising plurality of electronic control units (101,102,103, 104) (ECUs) for controlling energy supply, said energy management system (100) comprising: a reception means (10) for receiving an energy request from at least one of said plurality of ECUs (101,102,103, 104) a prioritize unit (20) for determining priority of the received energy request; and an energy management unit (30) for managing supply of energy depending on said determined priority of said received energy request from at least one of said plurality of ECUs (101,102,103, 104).