diff --git a/workflow/rules/postprocess.smk b/workflow/rules/postprocess.smk
index 719cd83..ac19881 100644
--- a/workflow/rules/postprocess.smk
+++ b/workflow/rules/postprocess.smk
@@ -30,6 +30,8 @@ RESULT_SUMMARIES = [
     "TotalCostNode",
     "PowerCostCountry",
     "TotalCostCountry",
+    "PowerCostGlobal",
+    "TotalCostGlobal",
     "Metrics"
 ]
 
@@ -128,8 +130,10 @@ rule calculate_costs:
     output:
         node_pwr_cost = "results/{scenario}/result_summaries/PowerCostNode.csv",
         country_pwr_cost = "results/{scenario}/result_summaries/PowerCostCountry.csv",
+        global_pwr_cost = "results/{scenario}/result_summaries/PowerCostGlobal.csv",
         node_cost = "results/{scenario}/result_summaries/TotalCostNode.csv",
         country_cost = "results/{scenario}/result_summaries/TotalCostCountry.csv",
+        global_cost = "results/{scenario}/result_summaries/TotalCostGlobal.csv",
     log:
         log = 'results/{scenario}/logs/node_cost.log'
     script: 
diff --git a/workflow/scripts/osemosys_global/summary/costs.py b/workflow/scripts/osemosys_global/summary/costs.py
index 1273a5c..deac4fe 100644
--- a/workflow/scripts/osemosys_global/summary/costs.py
+++ b/workflow/scripts/osemosys_global/summary/costs.py
@@ -84,17 +84,22 @@ def get_pwr_cost(demand: pd.DataFrame, cost: pd.DataFrame) -> pd.DataFrame:
         demand_csv = snakemake.input.demand
         power_cost_node_csv = snakemake.output.node_pwr_cost
         power_cost_country_csv = snakemake.output.country_pwr_cost
+        power_cost_global_csv = snakemake.output.global_pwr_cost        
         total_cost_node_csv = snakemake.output.node_cost
         total_cost_country_csv = snakemake.output.country_cost
+        total_cost_global_csv = snakemake.output.global_cost
+        
     else:
         discounted_cost_by_technology_csv = (
             "results/India/results/DiscountedCostByTechnology.csv"
         )
         demand_csv = "results/India/results/Demand.csv"
-        power_cost_node_csv = "results/India/result_summaries/NodePowerCost.csv"
-        power_cost_country_csv = "results/India/result_summaries/CountryPowerCost.csv"
-        total_cost_node_csv = "results/India/result_summaries/NodeCost.csv"
-        total_cost_country_csv = "results/India/result_summaries/CountryCost.csv"
+        power_cost_node_csv = "results/India/result_summaries/PowerCostNode.csv"
+        power_cost_country_csv = "results/India/result_summaries/PowerCostCountry.csv"
+        power_cost_global_csv = "results/India/result_summaries/PowerCostGlobal.csv"
+        total_cost_node_csv = "results/India/result_summaries/TotalCostNode.csv"
+        total_cost_country_csv = "results/India/result_summaries/TotalCostCountry.csv"
+        total_cost_global_csv = "results/India/result_summaries/TotalCostGlobal.csv"
 
     discounted_cost_by_technology = pd.read_csv(
         discounted_cost_by_technology_csv, index_col=[0, 1, 2]
@@ -128,11 +133,25 @@ def get_pwr_cost(demand: pd.DataFrame, cost: pd.DataFrame) -> pd.DataFrame:
 
     # country level metrics
 
-    tech_cost = get_tech_cost(discounted_cost_by_technology, country=True)
-    storage_cost = get_storage_cost(discounted_cost_by_storage, country=True)
-    cost = tech_cost.add(storage_cost, fill_value=0)
-    demand = get_demand(demand_raw, country=True)
-    pwr_cost = get_pwr_cost(demand, cost)
+    tech_cost_country = get_tech_cost(discounted_cost_by_technology, country=True)
+    storage_cost_country = get_storage_cost(discounted_cost_by_storage, country=True)
+    cost_country = tech_cost_country.add(storage_cost_country, fill_value=0)
+    demand_country = get_demand(demand_raw, country=True)
+    pwr_cost_country = get_pwr_cost(demand_country, cost_country)
+
+    pwr_cost_country.to_csv(power_cost_country_csv, index=True)
+    cost_country.to_csv(total_cost_country_csv, index=True)
+    
+    # global level metrics
+
+    cost_global = tech_cost_country.add(storage_cost_country, 
+                                        fill_value=0).groupby(["YEAR"]).sum()
+  
+    demand_global = get_demand(demand_raw, country=True)
+    demand_global = demand_global.groupby([
+        demand_global.index.get_level_values("YEAR")]).sum()
+
+    pwr_cost_global = get_pwr_cost(demand_global, cost_global)
 
-    pwr_cost.to_csv(power_cost_country_csv, index=True)
-    cost.to_csv(total_cost_country_csv, index=True)
+    pwr_cost_global.to_csv(power_cost_global_csv, index=True)
+    cost_global.to_csv(total_cost_global_csv, index=True)
\ No newline at end of file