diff --git a/src/main/java/org/gridsuite/network/map/NetworkMapService.java b/src/main/java/org/gridsuite/network/map/NetworkMapService.java
index 48288e6c..0bf984ff 100644
--- a/src/main/java/org/gridsuite/network/map/NetworkMapService.java
+++ b/src/main/java/org/gridsuite/network/map/NetworkMapService.java
@@ -8,6 +8,7 @@
 
 import com.powsybl.commons.PowsyblException;
 import com.powsybl.iidm.network.*;
+import org.gridsuite.network.map.model.BusMapData;
 import org.gridsuite.network.map.model.LineMapData;
 import org.gridsuite.network.map.model.SubstationMapData;
 import org.gridsuite.network.map.model.VoltageLevelMapData;
@@ -43,16 +44,26 @@ private Network getNetwork(UUID networkUuid) {
 
     private static VoltageLevelMapData toMapData(VoltageLevel voltageLevel) {
         return VoltageLevelMapData.builder()
-                .name(voltageLevel.getName())
+                .name(voltageLevel.getNameOrId())
                 .id(voltageLevel.getId())
                 .nominalVoltage(voltageLevel.getNominalV())
+                .buses(voltageLevel.getBusView().getBusStream().map(NetworkMapService::toBusData).collect(Collectors.toList()))
                 .build();
     }
 
+    private static BusMapData toBusData(Bus bus) {
+        BusMapData.BusMapDataBuilder builder = BusMapData.builder()
+                .id(bus.getId());
+        if (!Double.isNaN(bus.getV())) {
+            builder.v(bus.getV());
+        }
+        return builder.build();
+    }
+
     private static SubstationMapData toMapData(Substation substation) {
         return SubstationMapData.builder()
-                .name(substation.getName())
                 .id(substation.getId())
+                .name(substation.getNameOrId())
                 .countryName(substation.getCountry().map(Country::getName).orElse(null))
                 .voltageLevels(substation.getVoltageLevelStream().map(NetworkMapService::toMapData).collect(Collectors.toList()))
                 .build();
@@ -62,8 +73,8 @@ private static LineMapData toMapData(Line line) {
         Terminal terminal1 = line.getTerminal1();
         Terminal terminal2 = line.getTerminal2();
         LineMapData.LineMapDataBuilder builder = LineMapData.builder()
-                .name(line.getName())
                 .id(line.getId())
+                .name(line.getNameOrId())
                 .terminal1Connected(terminal1.isConnected())
                 .terminal2Connected(terminal2.isConnected())
                 .voltageLevelId1(terminal1.getVoltageLevel().getId())
diff --git a/src/main/java/org/gridsuite/network/map/model/BusMapData.java b/src/main/java/org/gridsuite/network/map/model/BusMapData.java
new file mode 100644
index 00000000..dd1c9671
--- /dev/null
+++ b/src/main/java/org/gridsuite/network/map/model/BusMapData.java
@@ -0,0 +1,22 @@
+/**
+ * Copyright (c) 2019, RTE (http://www.rte-france.com)
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+package org.gridsuite.network.map.model;
+
+import lombok.Builder;
+import lombok.Getter;
+
+/**
+ * @author Geoffroy Jamgotchian <geoffroy.jamgotchian at rte-france.com>
+ */
+@Builder
+@Getter
+public class BusMapData {
+
+    private String id;
+
+    private double v;
+}
diff --git a/src/main/java/org/gridsuite/network/map/model/VoltageLevelMapData.java b/src/main/java/org/gridsuite/network/map/model/VoltageLevelMapData.java
index 53750480..fe67ddc4 100644
--- a/src/main/java/org/gridsuite/network/map/model/VoltageLevelMapData.java
+++ b/src/main/java/org/gridsuite/network/map/model/VoltageLevelMapData.java
@@ -9,6 +9,8 @@
 import lombok.Builder;
 import lombok.Getter;
 
+import java.util.List;
+
 /**
  * @author Geoffroy Jamgotchian <geoffroy.jamgotchian at rte-france.com>
  */
@@ -21,4 +23,6 @@ public class VoltageLevelMapData {
     private String name;
 
     private double nominalVoltage;
+
+    private List<BusMapData> buses;
 }
diff --git a/src/test/resources/substations-map-data.json b/src/test/resources/substations-map-data.json
index d161a36a..a62d57e1 100644
--- a/src/test/resources/substations-map-data.json
+++ b/src/test/resources/substations-map-data.json
@@ -7,12 +7,24 @@
       {
         "id": "VLGEN",
         "name": "VLGEN",
-        "nominalVoltage": 24.0
+        "nominalVoltage": 24.0,
+        "buses": [
+          {
+            "id": "VLGEN_0",
+            "v": 0.0
+          }
+        ]
       },
       {
         "id": "VLHV1",
         "name": "VLHV1",
-        "nominalVoltage": 380.0
+        "nominalVoltage": 380.0,
+        "buses": [
+          {
+            "id": "VLHV1_0",
+            "v": 0.0
+          }
+        ]
       }
     ]
   },
@@ -23,12 +35,24 @@
       {
         "id": "VLHV2",
         "name": "VLHV2",
-        "nominalVoltage": 380.0
+        "nominalVoltage": 380.0,
+        "buses": [
+          {
+            "id": "VLHV2_0",
+            "v": 0.0
+          }
+        ]
       },
       {
         "id": "VLLOAD",
         "name": "VLLOAD",
-        "nominalVoltage": 150.0
+        "nominalVoltage": 150.0,
+        "buses": [
+          {
+            "id": "VLLOAD_0",
+            "v": 0.0
+          }
+        ]
       }
     ]
   }