# Preparing Networks¶

The preparation process of the PyPSA-Eur energy system model consists of a group of snakemake rules which are briefly outlined and explained in detail in the sections below.

Not all data dependencies are shipped with the git repository. Instead we provide separate data bundles which can be obtained using the retrieve* rules (Rules retrieve*). Having downloaded the necessary data,

With these and the externally extracted ENTSO-E online map topology (data/entsoegridkit), it can build a base PyPSA network with the following rules:

Then the process continues by calculating conventional power plant capacities, potentials, and per-unit availability time series for variable renewable energy carriers and hydro power plants with the following rules:

The central rule add_electricity then ties all the different data inputs together into a detailed PyPSA network stored in networks/elec.nc.