diff --git a/src/main/java/org/gridsuite/sensitivityanalysis/server/service/SensitivityAnalysisService.java b/src/main/java/org/gridsuite/sensitivityanalysis/server/service/SensitivityAnalysisService.java
index 883264a0..63d3f404 100644
--- a/src/main/java/org/gridsuite/sensitivityanalysis/server/service/SensitivityAnalysisService.java
+++ b/src/main/java/org/gridsuite/sensitivityanalysis/server/service/SensitivityAnalysisService.java
@@ -24,6 +24,8 @@
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
+import java.io.OutputStream;
+import java.nio.charset.StandardCharsets;
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
@@ -190,8 +192,10 @@ public byte[] exportSensitivityResultsAsCsv(UUID resultUuid, SensitivityAnalysis
             ZipOutputStream zipOutputStream = new ZipOutputStream(outputStream)) {
             zipOutputStream.putNextEntry(new ZipEntry("sensitivity_result.csv"));
 
+            // adding BOM to the beginning of file to help excel in some versions to detect this is UTF-8 encoding bytes
+            writeUTF8Bom(zipOutputStream);
             CsvWriterSettings settings = new CsvWriterSettings();
-            CsvWriter csvWriter = new CsvWriter(zipOutputStream, settings);
+            CsvWriter csvWriter = new CsvWriter(zipOutputStream, StandardCharsets.UTF_8, settings);
             csvWriter.writeHeaders(sensitivityAnalysisCsvFileInfos.getCsvHeaders());
             if (selector.getTabSelection() == ResultTab.N) {
                 result.getSensitivities()
@@ -223,6 +227,12 @@ public byte[] exportSensitivityResultsAsCsv(UUID resultUuid, SensitivityAnalysis
         }
     }
 
+    private static void writeUTF8Bom(OutputStream outputStream) throws IOException {
+        outputStream.write(0xef);
+        outputStream.write(0xbb);
+        outputStream.write(0xbf);
+    }
+
     private static Double nullIfNan(double d) {
         return Double.isNaN(d) ? null : d;
     }
diff --git a/src/test/java/org/gridsuite/sensitivityanalysis/server/SensitivityAnalysisControllerTest.java b/src/test/java/org/gridsuite/sensitivityanalysis/server/SensitivityAnalysisControllerTest.java
index e87c3805..a37c8017 100644
--- a/src/test/java/org/gridsuite/sensitivityanalysis/server/SensitivityAnalysisControllerTest.java
+++ b/src/test/java/org/gridsuite/sensitivityanalysis/server/SensitivityAnalysisControllerTest.java
@@ -636,7 +636,9 @@ void runAndSaveTest() throws Exception {
         byte[] csvFile = unzip(zipFile);
         String csvFileAsString = new String(csvFile, StandardCharsets.UTF_8);
         List<String> actualCsvLines = Arrays.asList(csvFileAsString.split("\n"));
-        List<String> expectedCsvLines = new ArrayList<>(List.of("functionId,variableId,functionReference,value",
+
+        // Including "\uFEFF" indicates the UTF-8 BOM at the start.
+        List<String> expectedCsvLines = new ArrayList<>(List.of("\uFEFFfunctionId,variableId,functionReference,value",
                 "l1,GEN,2.9,500.1",
                 "l2,GEN,2.8,500.2"));
 
diff --git a/src/test/java/org/gridsuite/sensitivityanalysis/server/service/SensitivityAnalysisServiceTest.java b/src/test/java/org/gridsuite/sensitivityanalysis/server/service/SensitivityAnalysisServiceTest.java
index 382ba1ab..23362cb0 100644
--- a/src/test/java/org/gridsuite/sensitivityanalysis/server/service/SensitivityAnalysisServiceTest.java
+++ b/src/test/java/org/gridsuite/sensitivityanalysis/server/service/SensitivityAnalysisServiceTest.java
@@ -338,7 +338,9 @@ public void testNoNKStillOK() throws Exception {
         byte[] csv = unzip(zip);
         String csvStr = new String(csv, StandardCharsets.UTF_8);
         List<String> actualLines = Arrays.asList(csvStr.split("\n"));
-        List<String> expectedLines = new ArrayList<>(List.of("functionId,variableId,functionReference,value",
+
+        // Including "\uFEFF" indicates the UTF-8 BOM at the start.
+        List<String> expectedLines = new ArrayList<>(List.of("\uFEFFfunctionId,variableId,functionReference,value",
                 "l1,GEN,2.9,500.1",
                 "l2,GEN,2.8,500.2",
                 "l3,LOAD,2.1,500.9"));
@@ -357,7 +359,9 @@ public void testNoNKStillOK() throws Exception {
         byte[] csv2 = unzip(zip2);
         String csvStr2 = new String(csv2, StandardCharsets.UTF_8);
         List<String> actualLines2 = Arrays.asList(csvStr2.split("\n"));
-        List<String> expectedLines2 = new ArrayList<>(List.of("functionId,variableId,contingencyId,functionReference,value,functionReferenceAfter,valueAfter"));
+
+        // Including "\uFEFF" indicates the UTF-8 BOM at the start.
+        List<String> expectedLines2 = new ArrayList<>(List.of("\uFEFFfunctionId,variableId,contingencyId,functionReference,value,functionReferenceAfter,valueAfter"));
 
         actualLines2.sort(String::compareTo);
         expectedLines2.sort(String::compareTo);
@@ -446,7 +450,9 @@ private void testNoN(boolean specific) throws Exception {
         byte[] csv = unzip(zip);
         String csvStr = new String(csv, StandardCharsets.UTF_8);
         List<String> actualLines = Arrays.asList(csvStr.split("\n"));
-        List<String> expectedLines = new ArrayList<>(List.of("functionId,variableId,contingencyId,functionReference,value,functionReferenceAfter,valueAfter",
+
+        // Including "\uFEFF" indicates the UTF-8 BOM at the start.
+        List<String> expectedLines = new ArrayList<>(List.of("\uFEFFfunctionId,variableId,contingencyId,functionReference,value,functionReferenceAfter,valueAfter",
                 "l1,GEN,a1,0.0,0.0,2.7,500.3",
                 "l1,GEN,a2,0.0,0.0,2.6,500.4",
                 "l1,GEN,a3,0.0,0.0,2.5,500.5",