diff --git a/scripts/prepare_sector_network.py b/scripts/prepare_sector_network.py
index 18d0d1a3..6862df97 100644
--- a/scripts/prepare_sector_network.py
+++ b/scripts/prepare_sector_network.py
@@ -2475,8 +2475,8 @@ def add_biomass(n, costs):
             efficiency2=-costs.at["solid biomass", "CO2 intensity"]
             + costs.at["BtL", "CO2 stored"],
             p_nom_extendable=True,
-            capital_cost=costs.at["BtL", "fixed"],
-            marginal_cost=costs.at["BtL", "efficiency"] * costs.at["BtL", "VOM"],
+            capital_cost=costs.at["BtL", "fixed"] * costs.at["BtL", "efficiency"],
+            marginal_cost=costs.at["BtL", "VOM"] * costs.at["BtL", "efficiency"],
         )
 
         # Assuming that acid gas removal (incl. CO2) from syngas i performed with Rectisol
@@ -2496,9 +2496,9 @@ def add_biomass(n, costs):
             + costs.at["BtL", "CO2 stored"] * (1 - costs.at["BtL", "capture rate"]),
             efficiency3=costs.at["BtL", "CO2 stored"] * costs.at["BtL", "capture rate"],
             p_nom_extendable=True,
-            capital_cost=costs.at["BtL", "fixed"]
+            capital_cost=costs.at["BtL", "fixed"] * costs.at["BtL", "efficiency"]
             + costs.at["biomass CHP capture", "fixed"] * costs.at["BtL", "CO2 stored"],
-            marginal_cost=costs.at["BtL", "efficiency"] * costs.at["BtL", "VOM"],
+            marginal_cost=costs.at["BtL", "VOM"] * costs.at["BtL", "efficiency"],
         )
 
     # BioSNG from solid biomass
@@ -2516,8 +2516,8 @@ def add_biomass(n, costs):
             efficiency3=-costs.at["solid biomass", "CO2 intensity"]
             + costs.at["BioSNG", "CO2 stored"],
             p_nom_extendable=True,
-            capital_cost=costs.at["BioSNG", "fixed"],
-            marginal_cost=costs.at["BioSNG", "efficiency"] * costs.at["BioSNG", "VOM"],
+            capital_cost=costs.at["BioSNG", "fixed"] * costs.at["BioSNG", "efficiency"],
+            marginal_cost=costs.at["BioSNG", "VOM"] * costs.at["BioSNG", "efficiency"],
         )
 
         # Assuming that acid gas removal (incl. CO2) from syngas i performed with Rectisol
@@ -2539,10 +2539,10 @@ def add_biomass(n, costs):
             + costs.at["BioSNG", "CO2 stored"]
             * (1 - costs.at["BioSNG", "capture rate"]),
             p_nom_extendable=True,
-            capital_cost=costs.at["BioSNG", "fixed"]
+            capital_cost=costs.at["BioSNG", "fixed"] * costs.at["BioSNG", "efficiency"]
             + costs.at["biomass CHP capture", "fixed"]
             * costs.at["BioSNG", "CO2 stored"],
-            marginal_cost=costs.at["BioSNG", "efficiency"] * costs.at["BioSNG", "VOM"],
+            marginal_cost=costs.at["BioSNG", "VOM"] * costs.at["BioSNG", "efficiency"],
         )