diff --git a/scripts/build_energy_totals.py b/scripts/build_energy_totals.py
index b09ba080..6afa6b33 100644
--- a/scripts/build_energy_totals.py
+++ b/scripts/build_energy_totals.py
@@ -696,8 +696,8 @@ def build_energy_totals(
     )
 
     efficiency_keywords = ["space efficiency", "water efficiency"]
-    to_drop = idees.columns[~idees.columns.str.contains("|".join(efficiency_keywords))]
-    to_drop = to_drop.append(["passenger cars", "passenger car efficiency"])
+    to_drop = idees.columns[idees.columns.str.contains("|".join(efficiency_keywords))]
+    to_drop = to_drop.append(pd.Index(["passenger cars", "passenger car efficiency"]))
 
     df = idees.reindex(new_index).drop(to_drop, axis=1)