diff --git a/src/components/dialogs/network-modifications/static-var-compensator/creation/standby-automaton-form-utils.ts b/src/components/dialogs/network-modifications/static-var-compensator/creation/standby-automaton-form-utils.ts
index f28b429cc0..91f010a023 100644
--- a/src/components/dialogs/network-modifications/static-var-compensator/creation/standby-automaton-form-utils.ts
+++ b/src/components/dialogs/network-modifications/static-var-compensator/creation/standby-automaton-form-utils.ts
@@ -91,12 +91,15 @@ export const getStandbyAutomatonFormValidationSchema = () =>
         [Q0]: requiredWhenQatNominalVChoice(yup.number().nullable()),
     });
 
+export const computeQ0 = (b0?: number | null, nominalV?: number | null): number | undefined => {
+    return b0 != null && nominalV != null ? b0 * Math.pow(nominalV, 2) : undefined;
+};
+
 export const getStandbyAutomatonFormData = ({
     addStandbyAutomaton,
     standby,
     b0,
     q0,
-    nominalV,
     lVoltageSetpoint,
     hVoltageSetpoint,
     lVoltageThreshold,
@@ -106,7 +109,6 @@ export const getStandbyAutomatonFormData = ({
     standby: any;
     b0: any;
     q0?: any;
-    nominalV?: any;
     lVoltageSetpoint: any;
     hVoltageSetpoint: any;
     lVoltageThreshold: any;
@@ -120,6 +122,6 @@ export const getStandbyAutomatonFormData = ({
         [LOW_VOLTAGE_THRESHOLD]: lVoltageThreshold,
         [HIGH_VOLTAGE_THRESHOLD]: hVoltageThreshold,
         [B0]: b0,
-        [Q0]: q0 === null && nominalV !== null && b0 !== null ? b0 * Math.pow(nominalV, 2) : q0,
+        [Q0]: q0,
     },
 });
diff --git a/src/components/dialogs/network-modifications/static-var-compensator/creation/static-var-compensator-creation-dialog.tsx b/src/components/dialogs/network-modifications/static-var-compensator/creation/static-var-compensator-creation-dialog.tsx
index b368cee421..cfabee9557 100644
--- a/src/components/dialogs/network-modifications/static-var-compensator/creation/static-var-compensator-creation-dialog.tsx
+++ b/src/components/dialogs/network-modifications/static-var-compensator/creation/static-var-compensator-creation-dialog.tsx
@@ -78,6 +78,7 @@ import {
     getReactiveFormValidationSchema,
 } from './set-points-limits-form-utils';
 import {
+    computeQ0,
     getStandbyAutomatonEmptyFormData,
     getStandbyAutomatonFormData,
     getStandbyAutomatonFormValidationSchema,
@@ -220,8 +221,7 @@ const StaticVarCompensatorCreationDialog: FC<any> = ({
                         addStandbyAutomaton: !!staticCompensator.standbyAutomatonInfos,
                         standby: staticCompensator.standbyAutomatonInfos?.standby,
                         b0: staticCompensator.standbyAutomatonInfos?.b0,
-                        q0: null,
-                        nominalV: staticCompensator.nominalV,
+                        q0: computeQ0(staticCompensator.standbyAutomatonInfos?.b0, staticCompensator.nominalV),
                         lVoltageSetpoint: staticCompensator.standbyAutomatonInfos?.lowVoltageSetpoint,
                         hVoltageSetpoint: staticCompensator.standbyAutomatonInfos?.highVoltageSetpoint,
                         lVoltageThreshold: staticCompensator.standbyAutomatonInfos?.lowVoltageThreshold,
@@ -274,7 +274,6 @@ const StaticVarCompensatorCreationDialog: FC<any> = ({
                     standby: staticCompensator.standby,
                     b0: staticCompensator.b0 ?? null,
                     q0: staticCompensator.q0 ?? null,
-                    nominalV: null,
                     lVoltageSetpoint: staticCompensator.lowVoltageSetpoint ?? null,
                     hVoltageSetpoint: staticCompensator.highVoltageSetpoint ?? null,
                     lVoltageThreshold: staticCompensator.lowVoltageThreshold ?? null,