diff --git a/rules/build_sector.smk b/rules/build_sector.smk
index db7084a9..cb3db79c 100755
--- a/rules/build_sector.smk
+++ b/rules/build_sector.smk
@@ -1027,6 +1027,7 @@ rule prepare_sector_network:
         RDIR=RDIR,
         heat_pump_sources=config_provider("sector", "heat_pump_sources"),
         heat_systems=config_provider("sector", "heat_systems"),
+        energy_totals_year=config_provider("energy", "energy_totals_year"),
     input:
         unpack(input_profile_offwind),
         **rules.cluster_gas_network.output,
diff --git a/scripts/prepare_sector_network.py b/scripts/prepare_sector_network.py
index 4aac5801..4ddcac32 100755
--- a/scripts/prepare_sector_network.py
+++ b/scripts/prepare_sector_network.py
@@ -4378,11 +4378,9 @@ if __name__ == "__main__":
     )
     pop_weighted_energy_totals.update(pop_weighted_heat_totals)
 
-    heating_efficiencies = (
-        (pd.read_csv(snakemake.input.heating_efficiencies, index_col=[0, 1]))
-        .swaplevel()
-        .loc[int(snakemake.config["energy"]["energy_totals_year"])]
-    )
+    fn = snakemake.input.heating_efficiencies
+    year = int(snakemake.params["energy_totals_year"])
+    heating_efficiencies = pd.read_csv(fn, index_col=[1, 0]).loc[year]
 
     patch_electricity_network(n)