diff --git a/scripts/prepare_sector_network.py b/scripts/prepare_sector_network.py
index 25db733e..423421aa 100644
--- a/scripts/prepare_sector_network.py
+++ b/scripts/prepare_sector_network.py
@@ -1236,10 +1236,10 @@ def add_heat(network):
                              bus3="co2 atmosphere",
                              carrier="urban central gas CHP",
                              p_nom_extendable=True,
-                             capital_cost=costs.at['central gas CHP','fixed']*costs.at['central gas CHP','efficiency']/(1+costs.at['central gas CHP','c_v']/costs.at['central gas CHP','c_b']),
+                             capital_cost=costs.at['central gas CHP','fixed']*costs.at['central gas CHP','efficiency'],
                              marginal_cost=costs.at['central gas CHP','VOM'],
-                             efficiency=costs.at['central gas CHP','efficiency']/(1+costs.at['central gas CHP','c_v']/costs.at['central gas CHP','c_b']),
-                             efficiency2=costs.at['central gas CHP','efficiency']/(1+costs.at['central gas CHP','c_v']/costs.at['central gas CHP','c_b'])/costs.at['central gas CHP','c_b'],
+                             efficiency=costs.at['central gas CHP','efficiency'],
+                             efficiency2=costs.at['central gas CHP','efficiency']/costs.at['central gas CHP','c_b'],
                              efficiency3=costs.at['gas','CO2 intensity'],
                              lifetime=costs.at['central gas CHP','lifetime'])
 
@@ -1252,10 +1252,10 @@ def add_heat(network):
                              bus4="co2 stored",
                              carrier="urban central gas CHP CCS",
                              p_nom_extendable=True,
-                             capital_cost=costs.at['central gas CHP CCS','fixed']*costs.at['central gas CHP CCS','efficiency']/(1+costs.at['central gas CHP CCS','c_v']/costs.at['central gas CHP CCS','c_b']),
+                             capital_cost=costs.at['central gas CHP CCS','fixed']*costs.at['central gas CHP CCS','efficiency'],
                              marginal_cost=costs.at['central gas CHP CCS','VOM'],
-                             efficiency=costs.at['central gas CHP CCS','efficiency']/(1+costs.at['central gas CHP CCS','c_v']/costs.at['central gas CHP CCS','c_b']),
-                             efficiency2=costs.at['central gas CHP CCS','efficiency']/(1+costs.at['central gas CHP CCS','c_v']/costs.at['central gas CHP CCS','c_b'])/costs.at['central gas CHP CCS','c_b'],
+                             efficiency=costs.at['central gas CHP CCS','efficiency'],
+                             efficiency2=costs.at['central gas CHP CCS','efficiency']/costs.at['central gas CHP CCS','c_b'],
                              efficiency3=costs.at['gas','CO2 intensity']*(1-options["ccs_fraction"]),
                              efficiency4=costs.at['gas','CO2 intensity']*options["ccs_fraction"],
                              lifetime=costs.at['central gas CHP CCS','lifetime'])
@@ -1456,10 +1456,10 @@ def add_biomass(network):
                      bus2=urban_central + " urban central heat",
                      carrier="urban central solid biomass CHP",
                      p_nom_extendable=True,
-                     capital_cost=costs.at['central solid biomass CHP','fixed']*costs.at['central solid biomass CHP','efficiency']/(1+costs.at['central solid biomass CHP','c_v']/costs.at['central solid biomass CHP','c_b']),
+                     capital_cost=costs.at['central solid biomass CHP','fixed']*costs.at['central solid biomass CHP','efficiency'],
                      marginal_cost=costs.at['central solid biomass CHP','VOM'],
-                     efficiency=costs.at['central solid biomass CHP','efficiency']/(1+costs.at['central solid biomass CHP','c_v']/costs.at['central solid biomass CHP','c_b']),
-                     efficiency2=costs.at['central solid biomass CHP','efficiency']/(1+costs.at['central solid biomass CHP','c_v']/costs.at['central solid biomass CHP','c_b'])/costs.at['central solid biomass CHP','c_b'],
+                     efficiency=costs.at['central solid biomass CHP','efficiency'],
+                     efficiency2=costs.at['central solid biomass CHP','efficiency-heat'],
                      lifetime=costs.at['central solid biomass CHP','lifetime'])
 
         network.madd("Link",
@@ -1471,10 +1471,10 @@ def add_biomass(network):
                      bus4="co2 stored",
                      carrier="urban central solid biomass CHP CCS",
                      p_nom_extendable=True,
-                     capital_cost=costs.at['central solid biomass CHP CCS','fixed']*costs.at['central solid biomass CHP CCS','efficiency']/(1+costs.at['central solid biomass CHP CCS','c_v']/costs.at['central solid biomass CHP CCS','c_b']),
+                     capital_cost=costs.at['central solid biomass CHP CCS','fixed']*costs.at['central solid biomass CHP CCS','efficiency'],
                      marginal_cost=costs.at['central solid biomass CHP CCS','VOM'],
-                     efficiency=costs.at['central solid biomass CHP CCS','efficiency']/(1+costs.at['central solid biomass CHP CCS','c_v']/costs.at['central solid biomass CHP CCS','c_b']),
-                     efficiency2=costs.at['central solid biomass CHP CCS','efficiency']/(1+costs.at['central solid biomass CHP CCS','c_v']/costs.at['central solid biomass CHP CCS','c_b'])/costs.at['central solid biomass CHP CCS','c_b'],
+                     efficiency=costs.at['central solid biomass CHP CCS','efficiency'],
+                     efficiency2=costs.at['central solid biomass CHP CCS','efficiency-heat'],
                      efficiency3=-costs.at['solid biomass','CO2 intensity']*options["ccs_fraction"],
                      efficiency4=costs.at['solid biomass','CO2 intensity']*options["ccs_fraction"],
                      lifetime=costs.at['central solid biomass CHP CCS','lifetime'])