diff --git a/scripts/prepare_sector_network.py b/scripts/prepare_sector_network.py
index 1d6e4ab0..2f4ce271 100644
--- a/scripts/prepare_sector_network.py
+++ b/scripts/prepare_sector_network.py
@@ -2163,7 +2163,6 @@ def add_biomass(n, costs):
         e_initial=solid_biomass_potentials_spatial,
     )
 
-
     n.madd(
         "Link",
         spatial.gas.biogas_to_gas,
@@ -2176,10 +2175,9 @@ def add_biomass(n, costs):
         marginal_cost=costs.at["biogas upgrading", "VOM"],
         efficiency=costs.at["biogas", "efficiency"],
         efficiency2=-costs.at["gas", "CO2 intensity"],
-        p_nom_extendable=True
+        p_nom_extendable=True,
     )
 
-
     if options.get("biomass_upgrading_cc"):
         # Assuming for costs that the CO2 from upgrading is pure, such as in amine scrubbing. I.e., with and without CC is
         # equivalent. Adding biomass CHP capture because biogas is often small-scale and decentral so further