Explicit representation of n largest district heating systems

config/config.default.yaml

@@ -688,6 +688,12 @@ sector:
     dh_areas:
       buffer: 1000
       handle_missing_countries: fill
+    subnodes:
+      enable: false
+      n_subnodes: 40
+      countries: []
+      demand_column: "Dem_GWh"
+      label_column: "Label"
   heat_pump_sources:
     urban central:
     - air

config/test/config.overnight.yaml

@@ -74,6 +74,10 @@ sector:
       - 10
       - 21
   district_heating:
+    subnodes:
+      enable: true
+      n_subnodes: 3
+      countries: ['BE']
     ptes:
       supplemental_heating:
         enable: true

doc/release_notes.rst

@@ -9,6 +9,9 @@ Release Notes
 Upcoming Release
 ================
 
+* Added option to model n largest district heating systems (according to demand in #1516) explicitly. Enable via ``sector: district_heating:
+  subnodes: enable: true``.
+
 * Remove snakemake's slurm plugin from windows installations (https://github.com/PyPSA/pypsa-eur/pull/2009).
 
 * Added Xpress solver configuration options (``xpress-default`` and ``xpress-gpu``) with barrier method settings optimized for large-scale linear programming problems.