diff --git a/doc/release_notes.rst b/doc/release_notes.rst
index 8326f615..d07d1901 100644
--- a/doc/release_notes.rst
+++ b/doc/release_notes.rst
@@ -174,6 +174,8 @@ Upcoming Release
 
 * Fix index of existing capacities in `add_power_capacities_installed_before_baseyear` with `m` option.
 
+* Fix fill missing data in `build_industry_sector_ratios_intermediate`.
+
 PyPSA-Eur 0.10.0 (19th February 2024)
 =====================================
 
diff --git a/scripts/build_industry_sector_ratios_intermediate.py b/scripts/build_industry_sector_ratios_intermediate.py
index 14e09505..d1525242 100644
--- a/scripts/build_industry_sector_ratios_intermediate.py
+++ b/scripts/build_industry_sector_ratios_intermediate.py
@@ -54,8 +54,10 @@ def build_industry_sector_ratios_intermediate():
         today_sector_ratios_ct = (
             group.droplevel(0)
             .T.reindex_like(future_sector_ratios)
-            .fillna(future_sector_ratios)
         )
+        missing_mask = (today_sector_ratios_ct.isna().all())
+        today_sector_ratios_ct.loc[:, missing_mask] = future_sector_ratios.loc[:, missing_mask]
+        today_sector_ratios_ct.loc[:, ~missing_mask] = today_sector_ratios_ct.loc[:, ~missing_mask].fillna(0)
         intermediate_sector_ratios[ct] = (
             today_sector_ratios_ct * (1 - fraction_future)
             + future_sector_ratios * fraction_future