diff --git a/doc/release_notes.rst b/doc/release_notes.rst
index be6be9fd..52b2ddc2 100644
--- a/doc/release_notes.rst
+++ b/doc/release_notes.rst
@@ -12,7 +12,7 @@ Upcoming Release
 
 * New configuration option ``everywhere_powerplants`` to build conventional powerplants everywhere, irrespective of existing powerplants locations, in the network (https://github.com/PyPSA/pypsa-eur/pull/850).
 
-* Remove option for wave energy as technology data is not maintained. 
+* Remove option for wave energy as technology data is not maintained.
 
 
 PyPSA-Eur 0.9.0 (5th January 2024)
diff --git a/scripts/solve_network.py b/scripts/solve_network.py
index db842054..0b503644 100644
--- a/scripts/solve_network.py
+++ b/scripts/solve_network.py
@@ -796,8 +796,8 @@ def add_pipe_retrofit_constraint(n):
 
 
 def add_co2_atmosphere_constraint(n, snapshots):
-    glcs = n.global_constraints[n.global_constraints.type=="co2_atmosphere"]
-    
+    glcs = n.global_constraints[n.global_constraints.type == "co2_atmosphere"]
+
     if glcs.empty:
         return
     for name, glc in glcs.iterrows():
@@ -812,11 +812,12 @@ def add_co2_atmosphere_constraint(n, snapshots):
         stores = n.stores.query("carrier in @emissions.index and not e_cyclic")
         if not stores.empty:
             last_i = snapshots[-1]
-            lhs = n.model["Store-e"].loc[last_i, stores.index]        
+            lhs = n.model["Store-e"].loc[last_i, stores.index]
             rhs = glc.constant
-            
+
             n.model.add_constraints(lhs <= rhs, name=f"GlobalConstraint-{name}")
 
+
 def extra_functionality(n, snapshots):
     """
     Collects supplementary constraints which will be passed to