diff --git a/scripts/prepare_sector_network.py b/scripts/prepare_sector_network.py
index 169e2614..00b9d39b 100755
--- a/scripts/prepare_sector_network.py
+++ b/scripts/prepare_sector_network.py
@@ -1806,7 +1806,6 @@ def add_heat(n, costs):
         heat_pump_types = ["air"] if "urban" in name else ["ground", "air"]
 
         for heat_pump_type in heat_pump_types:
-
             costs_name = f"{name_type} {heat_pump_type}-sourced heat pump"
             efficiency = (
                 cop[heat_pump_type][nodes[name]]