diff --git a/doc/release_notes.rst b/doc/release_notes.rst
index 52b2ddc2..ee8858a4 100644
--- a/doc/release_notes.rst
+++ b/doc/release_notes.rst
@@ -14,6 +14,8 @@ Upcoming Release
 
 * Remove option for wave energy as technology data is not maintained.
 
+* Bugfix: Assure entering of code block which corrects Norwegian heat demand.
+
 
 PyPSA-Eur 0.9.0 (5th January 2024)
 ==================================
diff --git a/scripts/build_energy_totals.py b/scripts/build_energy_totals.py
index 67b86466..80c5d442 100644
--- a/scripts/build_energy_totals.py
+++ b/scripts/build_energy_totals.py
@@ -479,7 +479,7 @@ def build_energy_totals(countries, eurostat, swiss, idees):
     # The main heating source for about 73 per cent of the households is based on electricity
     # => 26% is non-electric
 
-    if "NO" in df:
+    if "NO" in df.index:
         elec_fraction = 0.73
 
         no_norway = df.drop("NO")