diff --git a/data/validation/emission-spot-primary-market-auction-report-2019-data.xls b/data/validation/emission-spot-primary-market-auction-report-2019-data.xls
deleted file mode 100644
index 1bd2b429..00000000
Binary files a/data/validation/emission-spot-primary-market-auction-report-2019-data.xls and /dev/null differ
diff --git a/data/validation/energy-price-trends-xlsx-5619002.xlsx b/data/validation/energy-price-trends-xlsx-5619002.xlsx
deleted file mode 100644
index 61e36a75..00000000
Binary files a/data/validation/energy-price-trends-xlsx-5619002.xlsx and /dev/null differ
diff --git a/rules/postprocess.smk b/rules/postprocess.smk
index da9ac10b..2618680e 100644
--- a/rules/postprocess.smk
+++ b/rules/postprocess.smk
@@ -148,7 +148,6 @@ rule plot_elec_statistics:
         plotting=config["plotting"],
         barplots=STATISTICS_BARPLOTS,
     input:
-        overrides="data/override_component_attrs",
         network=RESULTS + "networks/elec_s{simpl}_{clusters}_ec_l{ll}_{opts}.nc",
     output:
         **{
diff --git a/rules/retrieve.smk b/rules/retrieve.smk
index 10783de9..0f2277aa 100644
--- a/rules/retrieve.smk
+++ b/rules/retrieve.smk
@@ -195,3 +195,43 @@ if config["enable"]["retrieve"]:
         retries: 2
         run:
             move(input[0], output[0])
+
+
+if config["enable"]["retrieve"]:
+
+    rule retrieve_monthly_co2_prices:
+        input:
+            HTTP.remote(
+                "https://www.eex.com/fileadmin/EEX/Downloads/EUA_Emission_Spot_Primary_Market_Auction_Report/Archive_Reports/emission-spot-primary-market-auction-report-2019-data.xls",
+                keep_local=True,
+                static=True,
+            ),
+        output:
+            "data/validation/emission-spot-primary-market-auction-report-2019-data.xls",
+        log:
+            LOGS + "retrieve_monthly_co2_prices.log",
+        resources:
+            mem_mb=5000,
+        retries: 2
+        run:
+            move(input[0], output[0])
+
+
+if config["enable"]["retrieve"]:
+
+    rule retrieve_monthly_fuel_prices:
+        input:
+            HTTP.remote(
+                "https://www.destatis.de/EN/Themes/Economy/Prices/Publications/Downloads-Energy-Price-Trends/energy-price-trends-xlsx-5619002.xlsx?__blob=publicationFile",
+                keep_local=True,
+                static=True,
+            ),
+        output:
+            "data/validation/energy-price-trends-xlsx-5619002.xls",
+        log:
+            LOGS + "retrieve_monthly_fuel_prices.log",
+        resources:
+            mem_mb=5000,
+        retries: 2
+        run:
+            move(input[0], output[0])
diff --git a/scripts/cluster_network.py b/scripts/cluster_network.py
index 65a3c36c..884b6a2b 100644
--- a/scripts/cluster_network.py
+++ b/scripts/cluster_network.py
@@ -483,7 +483,7 @@ if __name__ == "__main__":
     else:
         n_clusters = int(snakemake.wildcards.clusters)
 
-    if params.cluster_network["consider_efficiency_classes"]:
+    if params.cluster_network.get("consider_efficiency_classes", False):
         carriers = []
         for c in aggregate_carriers:
             gens = n.generators.query("carrier == @c")
diff --git a/scripts/plot_statistics.py b/scripts/plot_statistics.py
index 5057cf32..1e75203f 100644
--- a/scripts/plot_statistics.py
+++ b/scripts/plot_statistics.py
@@ -17,7 +17,7 @@ if __name__ == "__main__":
         from _helpers import mock_snakemake
 
         snakemake = mock_snakemake(
-            "plot_statistics",
+            "plot_elec_statistics",
             simpl="",
             opts="Ept-12h",
             clusters="37",