diff --git a/config/config.validation.yaml b/config/config.validation.yaml
index 20947164..0ffdb864 100644
--- a/config/config.validation.yaml
+++ b/config/config.validation.yaml
@@ -69,7 +69,7 @@ renewable:
     flatten_dispatch: 0.01
 
 conventional:
-  unit_commitment: false
+  unit_commitment: true
   dynamic_fuel_price: true
   nuclear:
     p_max_pu: "data/nuclear_p_max_pu.csv" # float of file name
@@ -82,7 +82,7 @@ load:
 
 
 lines:
-  s_max_pu: 0.25
+  s_max_pu: 0.23
   under_construction: 'remove' # 'zero': set capacity to zero, 'remove': remove, 'keep': with full capacity
 
 
diff --git a/scripts/build_monthly_prices.py b/scripts/build_monthly_prices.py
index db09d92a..9d00b7f8 100644
--- a/scripts/build_monthly_prices.py
+++ b/scripts/build_monthly_prices.py
@@ -77,6 +77,9 @@ price_2020 = (
     pd.Series({"coal": 3.0, "oil": 10.6, "gas": 5.6, "lignite": 1.1}) * 3.6
 )  # Eur/MWh
 
+# manual correction for better fit:
+price_2020["coal"] = 2.2
+
 
 def get_fuel_price():
     price = {}