diff --git a/cgmes/cgmes-conversion/src/main/java/com/powsybl/cgmes/conversion/export/EquipmentExport.java b/cgmes/cgmes-conversion/src/main/java/com/powsybl/cgmes/conversion/export/EquipmentExport.java
index 9ba20c06f80..2f430e3b41e 100644
--- a/cgmes/cgmes-conversion/src/main/java/com/powsybl/cgmes/conversion/export/EquipmentExport.java
+++ b/cgmes/cgmes-conversion/src/main/java/com/powsybl/cgmes/conversion/export/EquipmentExport.java
@@ -47,6 +47,7 @@ public final class EquipmentExport {
     private static final String PHASE_TAP_CHANGER_REGULATION_MODE_ACTIVE_POWER = "activePower";
     private static final String PHASE_TAP_CHANGER_REGULATION_MODE_CURRENT_FLOW = "currentFlow";
     private static final String RATIO_TAP_CHANGER_REGULATION_MODE_VOLTAGE = "voltage";
+    private static final String RATIO_TAP_CHANGER_REGULATION_MODE_REACTIVE_POWER = "reactivePower";
     private static final String TERMINAL_BOUNDARY = "Terminal_Boundary";
     private static final Logger LOG = LoggerFactory.getLogger(EquipmentExport.class);
 
@@ -937,8 +938,11 @@ private static <C extends Connectable<C>> void writeRatioTapChanger(C eq, RatioT
                 String terminalId = CgmesExportUtil.getTerminalId(rtc.getRegulationTerminal(), context);
                 cgmesRegulatingControlId = context.getNamingStrategy().getCgmesId(regulatingControlId.get());
                 if (!regulatingControlsWritten.contains(cgmesRegulatingControlId)) {
-                    // Regulating control mode is always "voltage"
-                    TapChangerEq.writeControl(cgmesRegulatingControlId, controlName, RATIO_TAP_CHANGER_REGULATION_MODE_VOLTAGE, terminalId, cimNamespace, writer, context);
+                    String tccMode = RATIO_TAP_CHANGER_REGULATION_MODE_VOLTAGE;
+                    if (rtc.getRegulationMode() == RatioTapChanger.RegulationMode.REACTIVE_POWER) {
+                        tccMode = RATIO_TAP_CHANGER_REGULATION_MODE_REACTIVE_POWER;
+                    }
+                    TapChangerEq.writeControl(cgmesRegulatingControlId, controlName, tccMode, terminalId, cimNamespace, writer, context);
                     regulatingControlsWritten.add(cgmesRegulatingControlId);
                 }
             }
diff --git a/cgmes/cgmes-conversion/src/main/java/com/powsybl/cgmes/conversion/export/SteadyStateHypothesisExport.java b/cgmes/cgmes-conversion/src/main/java/com/powsybl/cgmes/conversion/export/SteadyStateHypothesisExport.java
index f697bf6d8f6..83d6d78fe5e 100644
--- a/cgmes/cgmes-conversion/src/main/java/com/powsybl/cgmes/conversion/export/SteadyStateHypothesisExport.java
+++ b/cgmes/cgmes-conversion/src/main/java/com/powsybl/cgmes/conversion/export/SteadyStateHypothesisExport.java
@@ -445,14 +445,21 @@ private static void addRegulatingControlView(TapChanger<?, ?, ?, ?> tc, CgmesTap
             RegulatingControlView rcv = null;
             if (tc instanceof RatioTapChanger ratioTapChanger
                     && CgmesExportUtil.regulatingControlIsDefined(ratioTapChanger)) {
+                String unitMultiplier = switch (ratioTapChanger.getRegulationMode()) {
+                    case VOLTAGE -> {
+                        yield "k";
+                    }
+                    case REACTIVE_POWER -> {
+                        yield "M";
+                    }
+                };
                 rcv = new RegulatingControlView(controlId,
                         RegulatingControlType.TAP_CHANGER_CONTROL,
                         true,
                         ratioTapChanger.isRegulating(),
                         ratioTapChanger.getTargetDeadband(),
-                        ratioTapChanger.getTargetV(),
-                        // Unit multiplier is k for ratio tap changers (regulation value is a voltage in kV)
-                        "k");
+                        ratioTapChanger.getRegulationValue(),
+                        unitMultiplier);
             } else if (tc instanceof PhaseTapChanger phaseTapChanger
                     && CgmesExportUtil.regulatingControlIsDefined(phaseTapChanger)) {
                 boolean valid;