diff --git a/scripts/prepare_sector_network.py b/scripts/prepare_sector_network.py
index a3de3f20..09055525 100644
--- a/scripts/prepare_sector_network.py
+++ b/scripts/prepare_sector_network.py
@@ -2295,15 +2295,16 @@ def add_biomass(n, costs):
         biomass_import_price = options["solid_biomass_import"]["price"]
         # convert TWh in MWh
         biomass_import_max_amount = options["solid_biomass_import"]["max_amount"] * 1e6
-        biomass_import_upstream_emissions = options["solid_biomass_import"]["upstream_emissions_factor"]
-        
+        biomass_import_upstream_emissions = options["solid_biomass_import"][
+            "upstream_emissions_factor"
+        ]
+
         logger.info(
-        "Adding biomass import with cost %.2f EUR/MWh, a limit of %.2f TWh, and embedded emissions of %.2f%%",
-        biomass_import_price,
-        options["solid_biomass_import"]["max_amount"],
-        biomass_import_upstream_emissions * 100
+            "Adding biomass import with cost %.2f EUR/MWh, a limit of %.2f TWh, and embedded emissions of %.2f%%",
+            biomass_import_price,
+            options["solid_biomass_import"]["max_amount"],
+            biomass_import_upstream_emissions * 100,
         )
-        
 
         n.add("Carrier", "solid biomass import")
 
@@ -2333,7 +2334,8 @@ def add_biomass(n, costs):
             bus2="co2 atmosphere",
             carrier="solid biomass import",
             efficiency=1.0,
-            efficiency2=biomass_import_upstream_emissions* costs.at["solid biomass", "CO2 intensity"],
+            efficiency2=biomass_import_upstream_emissions
+            * costs.at["solid biomass", "CO2 intensity"],
             p_nom_extendable=True,
         )