diff --git a/dynawaltz/src/main/java/com/powsybl/dynawaltz/DynaWaltzContext.java b/dynawaltz/src/main/java/com/powsybl/dynawaltz/DynaWaltzContext.java
index 7042d5cdc..34207b28b 100644
--- a/dynawaltz/src/main/java/com/powsybl/dynawaltz/DynaWaltzContext.java
+++ b/dynawaltz/src/main/java/com/powsybl/dynawaltz/DynaWaltzContext.java
@@ -121,8 +121,12 @@ public DynaWaltzContext(Network network, String workingVariantId, List<BlackBoxM
 
     private Stream<BlackBoxModel> simplifyModels(Stream<BlackBoxModel> inputBbm, ReportNode reportNode) {
         Stream<BlackBoxModel> outputBbm = inputBbm;
-        for (ModelsSimplifier modelsSimplifier : ServiceLoader.load(ModelsSimplifier.class)) {
-            outputBbm = modelsSimplifier.simplifyModels(outputBbm, network, dynaWaltzParameters, reportNode);
+        for (ModelsRemovalSimplifier modelsSimplifier : ServiceLoader.load(ModelsRemovalSimplifier.class)) {
+            outputBbm = outputBbm.filter(modelsSimplifier.getModelRemovalPredicate(reportNode));
+        }
+        for (ModelsSubstitutionSimplifier modelsSimplifier : ServiceLoader.load(ModelsSubstitutionSimplifier.class)) {
+            outputBbm = outputBbm.map(modelsSimplifier.getModelSubstitutionFunction(network, dynaWaltzParameters, reportNode))
+                    .filter(Objects::nonNull);
         }
         return outputBbm;
     }
diff --git a/dynawaltz/src/main/java/com/powsybl/dynawaltz/ModelsRemovalSimplifier.java b/dynawaltz/src/main/java/com/powsybl/dynawaltz/ModelsRemovalSimplifier.java
new file mode 100644
index 000000000..13ba309b6
--- /dev/null
+++ b/dynawaltz/src/main/java/com/powsybl/dynawaltz/ModelsRemovalSimplifier.java
@@ -0,0 +1,21 @@
+/**
+ * Copyright (c) 2024, 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/.
+ * SPDX-License-Identifier: MPL-2.0
+ */
+package com.powsybl.dynawaltz;
+
+import com.powsybl.commons.report.ReportNode;
+import com.powsybl.dynawaltz.models.BlackBoxModel;
+
+import java.util.function.Predicate;
+
+/**
+ * @author Laurent Issertial <laurent.issertial at rte-france.com>
+ */
+public interface ModelsRemovalSimplifier {
+
+    Predicate<BlackBoxModel> getModelRemovalPredicate(ReportNode reportNode);
+}
diff --git a/dynawaltz/src/main/java/com/powsybl/dynawaltz/ModelsSimplifier.java b/dynawaltz/src/main/java/com/powsybl/dynawaltz/ModelsSubstitutionSimplifier.java
similarity index 62%
rename from dynawaltz/src/main/java/com/powsybl/dynawaltz/ModelsSimplifier.java
rename to dynawaltz/src/main/java/com/powsybl/dynawaltz/ModelsSubstitutionSimplifier.java
index 9e15b52df..78ea58fe7 100644
--- a/dynawaltz/src/main/java/com/powsybl/dynawaltz/ModelsSimplifier.java
+++ b/dynawaltz/src/main/java/com/powsybl/dynawaltz/ModelsSubstitutionSimplifier.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2023, RTE (http://www.rte-france.com)
+ * Copyright (c) 2024, 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/.
@@ -11,12 +11,12 @@
 import com.powsybl.dynawaltz.models.BlackBoxModel;
 import com.powsybl.iidm.network.Network;
 
-import java.util.stream.Stream;
+import java.util.function.Function;
 
 /**
  * @author Laurent Issertial <laurent.issertial at rte-france.com>
  */
-public interface ModelsSimplifier {
+public interface ModelsSubstitutionSimplifier {
 
-    Stream<BlackBoxModel> simplifyModels(Stream<BlackBoxModel> models, Network network, DynaWaltzParameters dynaWaltzParameters, ReportNode reportNode);
+    Function<BlackBoxModel, BlackBoxModel> getModelSubstitutionFunction(Network network, DynaWaltzParameters dynaWaltzParameters, ReportNode reportNode);
 }
diff --git a/dynawaltz/src/test/java/com/powsybl/dynawaltz/ModelsSimplifierTest.java b/dynawaltz/src/test/java/com/powsybl/dynawaltz/ModelsSimplifierTest.java
index 3155fa2eb..ec4cab7aa 100644
--- a/dynawaltz/src/test/java/com/powsybl/dynawaltz/ModelsSimplifierTest.java
+++ b/dynawaltz/src/test/java/com/powsybl/dynawaltz/ModelsSimplifierTest.java
@@ -23,7 +23,8 @@
 import java.util.Collections;
 import java.util.List;
 import java.util.ServiceLoader;
-import java.util.stream.Stream;
+import java.util.function.Function;
+import java.util.function.Predicate;
 
 import static org.junit.jupiter.api.Assertions.*;
 
@@ -33,9 +34,15 @@
 class ModelsSimplifierTest {
 
     @Test
-    void loadSimplifiers() {
-        List<ModelsSimplifier> simplifiers = Lists.newArrayList(ServiceLoader.load(ModelsSimplifier.class));
-        assertEquals(2, simplifiers.size());
+    void loadRemovalSimplifiers() {
+        List<ModelsRemovalSimplifier> simplifiers = Lists.newArrayList(ServiceLoader.load(ModelsRemovalSimplifier.class));
+        assertEquals(1, simplifiers.size());
+    }
+
+    @Test
+    void loadSubstitutionSimplifiers() {
+        List<ModelsSubstitutionSimplifier> simplifiers = Lists.newArrayList(ServiceLoader.load(ModelsSubstitutionSimplifier.class));
+        assertEquals(1, simplifiers.size());
     }
 
     @Test
@@ -65,19 +72,19 @@ void simplifyModels() {
         assertTrue(context.getBlackBoxDynamicModelStream().anyMatch(bbm -> bbm.getDynamicModelId().equalsIgnoreCase("newModel")));
     }
 
-    @AutoService(ModelsSimplifier.class)
-    public static class ModelsSimplifierFilter implements ModelsSimplifier {
+    @AutoService(ModelsRemovalSimplifier.class)
+    public static class ModelsSimplifierFilter implements ModelsRemovalSimplifier {
         @Override
-        public Stream<BlackBoxModel> simplifyModels(Stream<BlackBoxModel> models, Network network, DynaWaltzParameters dynaWaltzParameters, ReportNode reportNode) {
-            return models.filter(m -> !m.getDynamicModelId().equalsIgnoreCase("BBM_LOAD"));
+        public Predicate<BlackBoxModel> getModelRemovalPredicate(ReportNode reportNode) {
+            return m -> !m.getDynamicModelId().equalsIgnoreCase("BBM_LOAD");
         }
     }
 
-    @AutoService(ModelsSimplifier.class)
-    public static class ModelsSimplifierSubstitution implements ModelsSimplifier {
+    @AutoService(ModelsSubstitutionSimplifier.class)
+    public static class ModelsSimplifierSubstitution implements ModelsSubstitutionSimplifier {
         @Override
-        public Stream<BlackBoxModel> simplifyModels(Stream<BlackBoxModel> models, Network network, DynaWaltzParameters dynaWaltzParameters, ReportNode reportNode) {
-            return models.map(m -> {
+        public Function<BlackBoxModel, BlackBoxModel> getModelSubstitutionFunction(Network network, DynaWaltzParameters dynaWaltzParameters, ReportNode reportNode) {
+            return m -> {
                 if ("BBM_GEN".equalsIgnoreCase(m.getDynamicModelId()) && m instanceof AbstractGenerator gen) {
                     return GeneratorFictitiousBuilder.of(network)
                             .dynamicModelId("newModel")
@@ -86,7 +93,7 @@ public Stream<BlackBoxModel> simplifyModels(Stream<BlackBoxModel> models, Networ
                             .build();
                 }
                 return m;
-            });
+            };
         }
     }
 }