double solar rooftop PV potentials (closes #935)

PyPSA · May 15, 2024 · 27009f5 · 27009f5
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diff --git a/doc/release_notes.rst b/doc/release_notes.rst
@@ -10,6 +10,10 @@ Release Notes
 Upcoming Release
 ================
 
+* Doubled solar rooftop potentials to roughly 1 TW for Europe based on `recent
+  European Commission reports
+  <https://www.epj-pv.org/articles/epjpv/full_html/2024/01/pv230071/pv230071.html>`_.
+
 * Remove exogenously set share of rooftop PV (``costs: rooftop_share:``).
   Rooftop and utility-scale PV are now largely handled as separate technologies
   with endogenous shares.

diff --git a/scripts/prepare_sector_network.py b/scripts/prepare_sector_network.py
@@ -1024,9 +1024,9 @@ def insert_electricity_distribution_grid(n, costs):
     else:
         pop_solar = pop_layout.total.rename(index=lambda x: x + " solar")
 
-    # add max solar rooftop potential assuming 0.1 kW/m2 and 10 m2/person,
-    # i.e. 1 kW/person (population data is in thousands of people) so we get MW
-    potential = 0.1 * 10 * pop_solar
+    # add max solar rooftop potential assuming 0.1 kW/m2 and 20 m2/person,
+    # i.e. 2 kW/person (population data is in thousands of people) so we get MW
+    potential = 0.1 * 20 * pop_solar
 
     n.madd(
         "Generator",