This part of IEC 62257 provides a method for describing the results to be achieved by the electrification system independently of the technical solutions that could be implemented.IEC 62257-2 assessed the needs of the users and the different power system architectures which can be used for the meeting these needs.In relation to the needs of the different participants to the project, functional requirements which are to be achieved by the production and distribution subsystems are listed.In Clause 5, energy management rules to be considered are described. These are key issues as they have a great influence on the sizing of the electrification system.In Claus