The Nexus-e platform is a unique and powerful tool to quantify a wide range of impacts for possible future paths of the Swiss energy system. It has been under constant development since 2018 (Granado et al. 2018) and is hosted at the Energy Science Center at ETH Zürich (ESC). The core idea for its creation is to provide a modular platform that can integrate different models and make them work in synergy.In this project, we open source both the model code and select input data as well as its structure. This open sourcing process shall follow the FAIR Open Research Data (ORD) and Open Science (OS) principles. The goal is to develop a model framework that allows for two things:

• The quick integration of new models and tools into Nexus-e framework following the plugin approach.
• The possibility to execute existing Nexus-e models without long setup processes by any team member (junior, senior, scientist, technician) or any interested scientist to foster collaborative approaches in energy system analysis and discussion.

This has been achieved by implementing Nexus-e with a plugin architecture.