diff --git a/config.default.yaml b/config.default.yaml
index cd5e16f2..0b03b9fb 100755
--- a/config.default.yaml
+++ b/config.default.yaml
@@ -582,8 +582,6 @@ costs:
   lifetime: 25 #default lifetime
   # From a Lion Hirth paper, also reflects average of Noothout et al 2016
   discountrate: 0.07
-  # [EUR/USD] ECB: https://www.ecb.europa.eu/stats/exchange/eurofxref/html/eurofxref-graph-usd.en.html # noqa: E501
-  USD2013_to_EUR2013: 0.7532
   # Marginal and capital costs can be overwritten
   # capital_cost:
   #   onwind: 500
diff --git a/scripts/add_existing_baseyear.py b/scripts/add_existing_baseyear.py
index 52f412ec..9eecaadc 100644
--- a/scripts/add_existing_baseyear.py
+++ b/scripts/add_existing_baseyear.py
@@ -630,7 +630,6 @@ if __name__ == "__main__":
     Nyears = n.snapshot_weightings.generators.sum() / 8760.0
     costs = prepare_costs(
         snakemake.input.costs,
-        snakemake.config["costs"]["USD2013_to_EUR2013"],
         snakemake.config["costs"]["discountrate"],
         Nyears,
         snakemake.config["costs"]["lifetime"],
diff --git a/scripts/make_summary.py b/scripts/make_summary.py
index 840af9ba..cf258544 100644
--- a/scripts/make_summary.py
+++ b/scripts/make_summary.py
@@ -693,7 +693,6 @@ if __name__ == "__main__":
 
     costs_db = prepare_costs(
         snakemake.input.costs,
-        snakemake.config["costs"]["USD2013_to_EUR2013"],
         snakemake.config["costs"]["discountrate"],
         Nyears,
         snakemake.config["costs"]["lifetime"],
diff --git a/scripts/prepare_sector_network.py b/scripts/prepare_sector_network.py
index dd25ec38..6f8afd7f 100644
--- a/scripts/prepare_sector_network.py
+++ b/scripts/prepare_sector_network.py
@@ -725,13 +725,12 @@ def cycling_shift(df, steps=1):
 
 
 # TODO checkout PyPSA-Eur script
-def prepare_costs(cost_file, USD_to_EUR, discount_rate, Nyears, lifetime):
+def prepare_costs(cost_file, discount_rate, Nyears, lifetime):
     # set all asset costs and other parameters
     costs = pd.read_csv(cost_file, index_col=[0, 1]).sort_index()
 
     # correct units to MW and EUR
     costs.loc[costs.unit.str.contains("/kW"), "value"] *= 1e3
-    costs.loc[costs.unit.str.contains("USD"), "value"] *= USD_to_EUR
 
     # min_count=1 is important to generate NaNs which are then filled by fillna
     costs = (
@@ -3266,7 +3265,6 @@ if __name__ == "__main__":
 
     costs = prepare_costs(
         snakemake.input.costs,
-        snakemake.config["costs"]["USD2013_to_EUR2013"],
         snakemake.config["costs"]["discountrate"],
         Nyears,
         snakemake.config["costs"]["lifetime"],