The EU is demanding that the European Network of Transmission System Operators for Electricity (ENTSO-E) implement this ten-year power infrastructure plan transparently. Unfortunately, this modelling has so far been carried out using an expensive, proprietary tool (PLEXOS Energy Exemplar). The results were not easily reproducible. However, with the new model based on PyPSA-Eur, a transparent Ten-Year Network Development Plan can be created.