diff --git a/src/libs/antares/study/area/list.cpp b/src/libs/antares/study/area/list.cpp
index 85655722507..1e7d617b593 100644
--- a/src/libs/antares/study/area/list.cpp
+++ b/src/libs/antares/study/area/list.cpp
@@ -280,6 +280,7 @@ static bool AreaListSaveToFolderSingleArea(const Area& area, Clob& buffer, const
         ret = area.thermal.list.savePreproToFolder(buffer) && ret;
         buffer.clear() << folder << SEP << "input" << SEP << "thermal" << SEP << "series";
         ret = area.thermal.list.saveDataSeriesToFolder(buffer) && ret;
+        ret = area.thermal.list.saveEconomicCosts(buffer) && ret;
     }
 
     // Renewable cluster list
diff --git a/src/libs/antares/study/parts/thermal/cluster_list.cpp b/src/libs/antares/study/parts/thermal/cluster_list.cpp
index 3ebc2013fa3..1e0e4f26329 100644
--- a/src/libs/antares/study/parts/thermal/cluster_list.cpp
+++ b/src/libs/antares/study/parts/thermal/cluster_list.cpp
@@ -452,15 +452,29 @@ bool ThermalClusterList::savePreproToFolder(const AnyString& folder) const
             buffer.clear() << folder << SEP << c.parentArea->id << SEP << c.id();
             ret = c.prepro->saveToFolder(buffer) and ret;
         }
-        {
-            assert(c.parentArea and "cluster: invalid parent area");
-            buffer.clear() << folder << SEP << c.parentArea->id << SEP << c.id();
-            ret = c.ecoInput.saveToFolder(buffer) && ret;
-        }
     });
     return ret;
 }
 
+bool ThermalClusterList::saveEconomicCosts(const AnyString& folder) const
+{
+    if (empty())
+        return true;
+
+    Clob buffer;
+    bool ret = true;
+
+    each([&](const Data::ThermalCluster& c) {
+        assert(c.parentArea and "cluster: invalid parent area");
+        buffer.clear() << folder << SEP << c.parentArea->id << SEP << c.id();
+        ret = c.ecoInput.saveToFolder(buffer) && ret;
+    });
+    return ret;
+
+
+
+}
+
 bool ThermalClusterList::loadPreproFromFolder(Study& study,
                                               const StudyLoadOptions& options,
                                               const AnyString& folder)
diff --git a/src/libs/antares/study/parts/thermal/cluster_list.h b/src/libs/antares/study/parts/thermal/cluster_list.h
index 9cdfbd3bf7c..1d15b028a96 100644
--- a/src/libs/antares/study/parts/thermal/cluster_list.h
+++ b/src/libs/antares/study/parts/thermal/cluster_list.h
@@ -85,6 +85,7 @@ class ThermalClusterList : public ClusterList<ThermalCluster>
     bool loadEconomicCosts(Study& s, const AnyString& folder);
 
     bool savePreproToFolder(const AnyString& folder) const;
+    bool saveEconomicCosts(const AnyString& folder) const;
 
     bool saveToFolder(const AnyString& folder) const override;
 }; // class ThermalClusterList