diff --git a/config/config.default.yaml b/config/config.default.yaml
index 40dfb330..4245d926 100644
--- a/config/config.default.yaml
+++ b/config/config.default.yaml
@@ -637,6 +637,7 @@ industry:
     2045: 0.16
     2050: 0.20
   basic_chemicals_without_NH3_energy_demand_today: 1138. #TWh/a
+  basic_chemicals_without_NH3_production_today: 69. #Mt/a
   HVC_production_today: 52.
   MWh_elec_per_tHVC_mechanical_recycling: 0.547
   MWh_elec_per_tHVC_chemical_recycling: 6.9
diff --git a/scripts/build_industrial_production_per_country.py b/scripts/build_industrial_production_per_country.py
index 0aea4f15..afbe4de7 100644
--- a/scripts/build_industrial_production_per_country.py
+++ b/scripts/build_industrial_production_per_country.py
@@ -261,7 +261,7 @@ def separate_basic_chemicals(demand, year):
     demand["Basic chemicals"].clip(lower=0.0, inplace=True)
 
     # assume HVC, methanol, chlorine production proportional to non-ammonia basic chemicals
-    distribution_key = demand["Basic chemicals"] / demand["Basic chemicals"].sum()
+    distribution_key = demand["Basic chemicals"] / params["basic_chemicals_without_NH3_production_today"] / 1e3
     demand["HVC"] = params["HVC_production_today"] * 1e3 * distribution_key
     demand["Chlorine"] = params["chlorine_production_today"] * 1e3 * distribution_key
     demand["Methanol"] = params["methanol_production_today"] * 1e3 * distribution_key