diff --git a/scripts/add_electricity.py b/scripts/add_electricity.py
index 64cf442e..83ec4bb9 100755
--- a/scripts/add_electricity.py
+++ b/scripts/add_electricity.py
@@ -85,17 +85,17 @@ It further adds extendable ``generators`` with **zero** capacity for
 """
 
 import logging
+from itertools import product
 
 import geopandas as gpd
 import numpy as np
 import pandas as pd
 import powerplantmatching as pm
 import pypsa
+import scipy.sparse as sparse
 import xarray as xr
 from _helpers import configure_logging, update_p_nom_max
 from powerplantmatching.export import map_country_bus
-from itertools import product
-import scipy.sparse as sparse
 from shapely.prepared import prep
 
 idx = pd.IndexSlice
@@ -217,6 +217,7 @@ def load_powerplants(ppl_fn):
         .replace({"carrier": carrier_dict})
     )
 
+
 def Shapes2Shapes(orig, dest):
     """
     Adopted from vresutils.transfer.Shapes2Shapes()
@@ -224,10 +225,10 @@ def Shapes2Shapes(orig, dest):
     orig_prepped = list(map(prep, orig))
     transfer = sparse.lil_matrix((len(dest), len(orig)), dtype=float)
 
-    for i,j in product(range(len(dest)), range(len(orig))):
+    for i, j in product(range(len(dest)), range(len(orig))):
         if orig_prepped[j].intersects(dest[i]):
             area = orig[j].intersection(dest[i]).area
-            transfer[i,j] = area/dest[i].area
+            transfer[i, j] = area / dest[i].area
 
     return transfer
 
diff --git a/scripts/prepare_sector_network.py b/scripts/prepare_sector_network.py
index 944c3caa..012c9714 100644
--- a/scripts/prepare_sector_network.py
+++ b/scripts/prepare_sector_network.py
@@ -22,13 +22,13 @@ from _helpers import (
     override_component_attrs,
     update_config_with_sector_opts,
 )
+from add_electricity import calculate_annuity
 from build_energy_totals import build_co2_totals, build_eea_co2, build_eurostat_co2
 from networkx.algorithms import complement
 from networkx.algorithms.connectivity.edge_augmentation import k_edge_augmentation
 from pypsa.geo import haversine_pts
 from pypsa.io import import_components_from_dataframe
 from scipy.stats import beta
-from add_electricity import calculate_annuity
 
 logger = logging.getLogger(__name__)