diff --git a/scripts/prepare_sector_network.py b/scripts/prepare_sector_network.py
index c8dc9c28..9634ed07 100644
--- a/scripts/prepare_sector_network.py
+++ b/scripts/prepare_sector_network.py
@@ -1340,7 +1340,7 @@ def add_heat(network):
                              capital_cost=costs.at['central gas CHP','fixed']*costs.at['central gas CHP','efficiency'] + costs.at['biomass CHP capture','fixed']*costs.at['gas','CO2 intensity'],
                              marginal_cost=costs.at['central gas CHP','VOM'],
                              efficiency=costs.at['central gas CHP','efficiency'] - costs.at['gas','CO2 intensity']*(costs.at['biomass CHP capture','electricity-input'] + costs.at['biomass CHP capture','compression-electricity-input']),
-                             efficiency2=costs.at['central gas CHP','efficiency']/costs.at['central gas CHP','c_b'] + costs.at['gas','CO2 intensity']*(costs.at['biomass CHP capture','heat-output'] + costs.at['biomass CHP capture','compression-heat-output'] - costs.at['biomass CHP capture','heat-output']),
+                             efficiency2=costs.at['central gas CHP','efficiency']/costs.at['central gas CHP','c_b'] + costs.at['gas','CO2 intensity']*(costs.at['biomass CHP capture','heat-output'] + costs.at['biomass CHP capture','compression-heat-output'] - costs.at['biomass CHP capture','heat-input']),
                              efficiency3=costs.at['gas','CO2 intensity']*(1-costs.at['biomass CHP capture','capture_rate']),
                              efficiency4=costs.at['gas','CO2 intensity']*costs.at['biomass CHP capture','capture_rate'],
                              lifetime=costs.at['central gas CHP','lifetime'])
@@ -1559,7 +1559,7 @@ def add_biomass(network):
                      capital_cost=costs.at['central solid biomass CHP','fixed']*costs.at['central solid biomass CHP','efficiency'] + costs.at['biomass CHP capture','fixed']*costs.at['solid biomass','CO2 intensity'],
                      marginal_cost=costs.at['central solid biomass CHP','VOM'],
                      efficiency=costs.at['central solid biomass CHP','efficiency'] - costs.at['solid biomass','CO2 intensity']*(costs.at['biomass CHP capture','electricity-input'] + costs.at['biomass CHP capture','compression-electricity-input']),
-                     efficiency2=costs.at['central solid biomass CHP','efficiency-heat'] + costs.at['solid biomass','CO2 intensity']*(costs.at['biomass CHP capture','heat-output'] + costs.at['biomass CHP capture','compression-heat-output'] - costs.at['biomass CHP capture','heat-output']),
+                     efficiency2=costs.at['central solid biomass CHP','efficiency-heat'] + costs.at['solid biomass','CO2 intensity']*(costs.at['biomass CHP capture','heat-output'] + costs.at['biomass CHP capture','compression-heat-output'] - costs.at['biomass CHP capture','heat-input']),
                      efficiency3=-costs.at['solid biomass','CO2 intensity']*costs.at['biomass CHP capture','capture_rate'],
                      efficiency4=costs.at['solid biomass','CO2 intensity']*costs.at['biomass CHP capture','capture_rate'],
                      lifetime=costs.at['central solid biomass CHP','lifetime'])