diff --git a/simba/costs.py b/simba/costs.py
index 100644d..e03bd2b 100644
--- a/simba/costs.py
+++ b/simba/costs.py
@@ -305,11 +305,11 @@ def set_electricity_costs(self):
 
 
             # Get the calculation strategy / method from args.
-            # If no value is set use the same  strategy as the charging strategy
+            # If no value is set, use the same strategy as the charging strategy
             default_cost_strategy = vars(self.args)["strategy_" + station.get("type")]
 
             strategy_name = "cost_calculation_strategy_" + station.get("type")
-            cost_calculation_strategy = vars(self.args).get(strategy_name, default_cost_strategy)
+            cost_calculation_strategy = vars(self.args).get(strategy_name) or default_cost_strategy
 
             # calculate costs for electricity
             try:
diff --git a/tests/test_cost_calculation.py b/tests/test_cost_calculation.py
index 92d41a2..b5ce6b4 100644
--- a/tests/test_cost_calculation.py
+++ b/tests/test_cost_calculation.py
@@ -2,6 +2,7 @@
 from simba.util import uncomment_json_file
 from simba.costs import calculate_costs
 
+
 class TestCostCalculation:
     def test_cost_calculation(self):
         schedule, scenario, args = BasicSchedule().basic_run()
@@ -9,9 +10,54 @@ def test_cost_calculation(self):
         with open(file, "r") as file:
             cost_params = uncomment_json_file(file)
 
-        costs = calculate_costs(cost_params, scenario, schedule, args)
+        assert args.strategy_deps == "balanced"
+        assert args.strategy_opps == "greedy"
+
+        args.cost_calculation_strategy_deps = None
+        args.cost_calculation_strategy_opps = None
+
+        costs_vanilla = calculate_costs(cost_params, scenario, schedule, args)
 
         assert args.strategy_deps == "balanced"
         assert args.strategy_opps == "greedy"
 
-        args.cost_calculation_strategy_opps == "balanced"
+        args.cost_calculation_strategy_deps = "balanced"
+        args.cost_calculation_strategy_opps = "greedy"
+        costs_with_same_strat = calculate_costs(cost_params, scenario, schedule, args)
+
+        # assert all costs are the same
+        for station in costs_vanilla.costs_per_gc:
+            for key in costs_vanilla.costs_per_gc[station]:
+                assert (costs_vanilla.costs_per_gc[station][key] ==
+                        costs_with_same_strat.costs_per_gc[station][key]), station
+
+        args.cost_calculation_strategy_opps = "balanced_market"
+        args.cost_calculation_strategy_deps = "balanced_market"
+        costs_with_other_strat = calculate_costs(cost_params, scenario, schedule, args)
+        print(costs_vanilla.costs_per_gc["cumulated"]["c_total_annual"])
+        print(costs_with_other_strat.costs_per_gc["cumulated"]["c_total_annual"])
+        station = "cumulated"
+        for key in costs_vanilla.costs_per_gc[station]:
+            if not "el_energy" in key:
+                continue
+            assert (costs_vanilla.costs_per_gc[station][key] !=
+                    costs_with_other_strat.costs_per_gc[station][key]), key
+
+        args.cost_calculation_strategy_opps = "peak_load_window"
+        args.cost_calculation_strategy_deps = "peak_load_window"
+        costs_with_other_strat = calculate_costs(cost_params, scenario, schedule, args)
+        station = "cumulated"
+        for key in costs_vanilla.costs_per_gc[station]:
+            if not "el_energy" in key:
+                continue
+            assert (costs_vanilla.costs_per_gc[station][key] !=
+                    costs_with_other_strat.costs_per_gc[station][key]), key
+
+        args.cost_calculation_strategy_opps = "peak_shaving"
+        args.cost_calculation_strategy_deps = "peak_shaving"
+        costs_with_other_strat = calculate_costs(cost_params, scenario, schedule, args)
+        # assert all costs are the same
+        for station in costs_vanilla.costs_per_gc:
+            for key in costs_vanilla.costs_per_gc[station]:
+                assert (costs_vanilla.costs_per_gc[station][key] ==
+                        costs_with_other_strat.costs_per_gc[station][key]), station