diff --git a/.DS_Store b/.DS_Store
deleted file mode 100644
index 61f046823..000000000
Binary files a/.DS_Store and /dev/null differ
diff --git a/scripts/prepare_sector_network.py b/scripts/prepare_sector_network.py
index d4252e467..1a7d9cdc7 100755
--- a/scripts/prepare_sector_network.py
+++ b/scripts/prepare_sector_network.py
@@ -2608,7 +2608,8 @@ def add_heat(
             )
 
             etpr_water_tanks = costs.at[
-                heat_system.central_or_decentral + " water tank storage", "energy to power ratio"
+                heat_system.central_or_decentral + " water tank storage",
+                "energy to power ratio",
             ]
 
             n.add(
@@ -2637,9 +2638,9 @@ def add_heat(
                 p_nom_extendable=True,
             )
 
-            n.links.loc[
-                nodes + f" {heat_system} water tanks charger", "etpr"
-            ] = etpr_water_tanks
+            n.links.loc[nodes + f" {heat_system} water tanks charger", "etpr"] = (
+                etpr_water_tanks
+            )
 
             tes_time_constant_days = options["tes_tau"][
                 heat_system.central_or_decentral
@@ -2682,7 +2683,8 @@ def add_heat(
                     bus0=nodes + f" {heat_system} heat",
                     bus1=nodes + f" {heat_system} water pits",
                     efficiency=costs.at[
-                        "central water pit charger", "efficiency",
+                        "central water pit charger",
+                        "efficiency",
                     ],
                     carrier=f"{heat_system} water pits charger",
                     p_nom_extendable=True,
@@ -2695,14 +2697,15 @@ def add_heat(
                     bus1=nodes + f" {heat_system} heat",
                     carrier=f"{heat_system} water pits discharger",
                     efficiency=costs.at[
-                        "central water pit discharger", "efficiency",
+                        "central water pit discharger",
+                        "efficiency",
                     ],
                     p_nom_extendable=True,
                 )
 
-                n.links.loc[
-                    nodes + f" {heat_system} water pits charger", "etpr"
-                ] = etpr_water_pit
+                n.links.loc[nodes + f" {heat_system} water pits charger", "etpr"] = (
+                    etpr_water_pit
+                )
 
                 n.add(
                     "Store",
diff --git a/scripts/solve_network.py b/scripts/solve_network.py
index d8bddd75a..4c165d3ad 100644
--- a/scripts/solve_network.py
+++ b/scripts/solve_network.py
@@ -33,10 +33,10 @@
 import sys
 from typing import Any
 
+import linopy
 import numpy as np
 import pandas as pd
 import pypsa
-import linopy
 import xarray as xr
 import yaml
 from _benchmark import memory_logger
@@ -803,7 +803,9 @@ def add_TES_etpr_constraints(n):
     if not n.links.p_nom_extendable.any():
         return
 
-    tes_charger_bool = n.links.index.str.contains("water tanks charger|water pits charger")
+    tes_charger_bool = n.links.index.str.contains(
+        "water tanks charger|water pits charger"
+    )
     tes_store_bool = n.stores.index.str.contains("water tanks|water pits")
 
     chargers_ext = n.links[tes_charger_bool].query("p_nom_extendable").index
@@ -822,7 +824,7 @@ def add_TES_etpr_constraints(n):
         linear_expr_list, dim="Store-ext, Link-ext", cls=type(linear_expr_list[0])
     )
 
-    n.model.add_constraints(merged_expr == 0, name='TES_etpr')
+    n.model.add_constraints(merged_expr == 0, name="TES_etpr")
 
 
 def add_TES_charger_ratio_constraints(n):
@@ -834,7 +836,9 @@ def add_TES_charger_ratio_constraints(n):
     if not n.links.p_nom_extendable.any():
         return
 
-    discharger_bool = n.links.index.str.contains("water tanks discharger|water pits discharger")
+    discharger_bool = n.links.index.str.contains(
+        "water tanks discharger|water pits discharger"
+    )
     charger_bool = n.links.index.str.contains("water tanks charger|water pits charger")
 
     dischargers_ext = n.links[discharger_bool].query("p_nom_extendable").index
@@ -842,8 +846,8 @@ def add_TES_charger_ratio_constraints(n):
 
     eff = n.links.efficiency[dischargers_ext].values
     lhs = (
-            n.model["Link-p_nom"].loc[chargers_ext]
-            - n.model["Link-p_nom"].loc[dischargers_ext] * eff
+        n.model["Link-p_nom"].loc[chargers_ext]
+        - n.model["Link-p_nom"].loc[dischargers_ext] * eff
     )
 
     n.model.add_constraints(lhs == 0, name="TES_charger_ratio")