diff --git a/src/devices_models/devices/AC_branches.jl b/src/devices_models/devices/AC_branches.jl
index 2125a69cd9..12fa4c9539 100644
--- a/src/devices_models/devices/AC_branches.jl
+++ b/src/devices_models/devices/AC_branches.jl
@@ -485,7 +485,7 @@ function _make_flow_expressions!(
 
     t1_ = time()
     jump_model = get_jump_model(container)
-    #=
+
     tasks = map(branches) do name
         ptdf_col = ptdf[name, :]
         Threads.@spawn _make_flow_expressions!(
@@ -500,8 +500,9 @@ function _make_flow_expressions!(
         name, expressions = fetch(task)
         branch_flow_expr[name, :] .= expressions
     end
-    =#
 
+
+    #= Leaving serial code commented out for debugging purposes in the future
     for name in branches
         ptdf_col = ptdf[name, :]
         branch_flow_expr[name, :] .= _make_flow_expressions!(
@@ -512,6 +513,7 @@ function _make_flow_expressions!(
             nodal_balance_expressions.data,
         )
     end
+    =#
 
     t2_ = time()
     @error "time to build PTDF expressions $branch_Type  $(t2_ - t1_)"