diff --git a/scripts/build_industrial_production_per_country_tomorrow.py b/scripts/build_industrial_production_per_country_tomorrow.py
index c1d5d5da..1bfc40f2 100644
--- a/scripts/build_industrial_production_per_country_tomorrow.py
+++ b/scripts/build_industrial_production_per_country_tomorrow.py
@@ -6,16 +6,21 @@ industrial_production = pd.read_csv(snakemake.input.industrial_production_per_co
 
 total_steel = industrial_production[["Integrated steelworks","Electric arc"]].sum(axis=1)
 
+fraction_primary_stays_primary = snakemake.config["industry"]["St_primary_fraction"]*total_steel.sum()/industrial_production["Integrated steelworks"].sum()
+
 industrial_production.insert(2, "DRI + Electric arc",
-                             snakemake.config["industry"]["St_primary_fraction"]*total_steel)
-industrial_production["Electric arc"] = (1 - snakemake.config["industry"]["St_primary_fraction"])*total_steel
+                             fraction_primary_stays_primary*industrial_production["Integrated steelworks"])
+
+industrial_production["Electric arc"] = total_steel - industrial_production["DRI + Electric arc"]
 industrial_production["Integrated steelworks"] = 0.
 
 
 total_aluminium = industrial_production[["Aluminium - primary production","Aluminium - secondary production"]].sum(axis=1)
 
-industrial_production["Aluminium - primary production"] = snakemake.config["industry"]["Al_primary_fraction"]*total_aluminium
-industrial_production["Aluminium - secondary production"] = (1 - snakemake.config["industry"]["Al_primary_fraction"])*total_aluminium
+fraction_primary_stays_primary = snakemake.config["industry"]["Al_primary_fraction"]*total_aluminium.sum()/industrial_production["Aluminium - primary production"].sum()
+
+industrial_production["Aluminium - primary production"] = fraction_primary_stays_primary*industrial_production["Aluminium - primary production"]
+industrial_production["Aluminium - secondary production"] = total_aluminium - industrial_production["Aluminium - primary production"]
 
 
 industrial_production.to_csv(snakemake.output.industrial_production_per_country_tomorrow,