Large scale data/model exchange and change management across multiple internal and external domains to provide a consolidated “single source of truth” for model data. Model Management Module PSSODMS Provides a centralised network model management system to provide a single location to coordinate and manage network modelling information. It allows transmission companies to store, manage, visualise, synchronise centrally, and exchange their network model data across multiple domains (e.g. grid operations, network planning etc.), systems, entities, and time horizons. Based on the industry-approved open CIM standards, it works on platforms such as Microsoft SQL Server and Oracle. It provides automated case creation for network operations/planning studies and supports real-time situational awareness (including state estimation, integration with SCADA and measurement data. Project Modeling and Data Management PSS MOD PSS MOD  is a secure, web-based application and central data repository that allow users to submit, view, validate and audit planning model data. Including time-bound network changes organised as multiphase projects. It coordinates the submission of network model data from local and/or remote users. It provides access to complete study cases “on-demand”, thus providing a solution for large scale online data/model exchange and change management.