diff --git a/balances-adjustment/src/main/java/com/powsybl/balances_adjustment/util/CountryArea.java b/balances-adjustment/src/main/java/com/powsybl/balances_adjustment/util/CountryArea.java
index d6630a43..8c95de16 100644
--- a/balances-adjustment/src/main/java/com/powsybl/balances_adjustment/util/CountryArea.java
+++ b/balances-adjustment/src/main/java/com/powsybl/balances_adjustment/util/CountryArea.java
@@ -121,20 +121,24 @@ private boolean isAreaBorder(HvdcLine hvdcLine) {
     }
 
     private double getLeavingFlow(DanglingLine danglingLine) {
-        return danglingLine.getTerminal().isConnected() ? -danglingLine.getBoundary().getP() : 0;
+        return danglingLine.getTerminal().isConnected() ? zeroIfNan(-danglingLine.getBoundary().getP()) : 0;
     }
 
     private double getLeavingFlow(Line line) {
-        double flowSide1 = line.getTerminal1().isConnected() && !Double.isNaN(line.getTerminal1().getP()) ? line.getTerminal1().getP() : 0;
-        double flowSide2 = line.getTerminal2().isConnected() && !Double.isNaN(line.getTerminal2().getP()) ? line.getTerminal2().getP() : 0;
+        double flowSide1 = line.getTerminal1().isConnected() ? zeroIfNan(line.getTerminal1().getP()) : 0;
+        double flowSide2 = line.getTerminal2().isConnected() ? zeroIfNan(line.getTerminal2().getP()) : 0;
         double directFlow = (flowSide1 - flowSide2) / 2;
         return countries.contains(line.getTerminal1().getVoltageLevel().getSubstation().map(Substation::getNullableCountry).orElse(null)) ? directFlow : -directFlow;
     }
 
     private double getLeavingFlow(HvdcLine hvdcLine) {
-        double flowSide1 = hvdcLine.getConverterStation1().getTerminal().isConnected() && !Double.isNaN(hvdcLine.getConverterStation1().getTerminal().getP()) ? hvdcLine.getConverterStation1().getTerminal().getP() : 0;
-        double flowSide2 = hvdcLine.getConverterStation2().getTerminal().isConnected() && !Double.isNaN(hvdcLine.getConverterStation2().getTerminal().getP()) ? hvdcLine.getConverterStation2().getTerminal().getP() : 0;
+        double flowSide1 = hvdcLine.getConverterStation1().getTerminal().isConnected() ? zeroIfNan(hvdcLine.getConverterStation1().getTerminal().getP()) : 0;
+        double flowSide2 = hvdcLine.getConverterStation2().getTerminal().isConnected() ? zeroIfNan(hvdcLine.getConverterStation2().getTerminal().getP()) : 0;
         double directFlow = (flowSide1 - flowSide2) / 2;
         return countries.contains(hvdcLine.getConverterStation1().getTerminal().getVoltageLevel().getSubstation().map(Substation::getNullableCountry).orElse(null)) ? directFlow : -directFlow;
     }
+
+    private static double zeroIfNan(double aPossiblyNanValue) {
+        return Double.isNaN(aPossiblyNanValue) ? 0 : aPossiblyNanValue;
+    }
 }
diff --git a/balances-adjustment/src/test/java/com/powsybl/balances_adjustment/util/CountryAreaTest.java b/balances-adjustment/src/test/java/com/powsybl/balances_adjustment/util/CountryAreaTest.java
index b2d826e9..8bc7a4ca 100644
--- a/balances-adjustment/src/test/java/com/powsybl/balances_adjustment/util/CountryAreaTest.java
+++ b/balances-adjustment/src/test/java/com/powsybl/balances_adjustment/util/CountryAreaTest.java
@@ -129,4 +129,31 @@ void testLeavingFlowToCountryWithTieLines() {
         assertEquals(0, countryAreaCH.getLeavingFlowToCountry(countryAreaDE), EPSILON);
         assertEquals(-699, countryAreaIT.getLeavingFlowToCountry(countryAreaAT), EPSILON);
     }
+
+    @Test
+    void testNetPositionIsZeroWhenDanglingLineBorderPIsNaN() {
+        Network testNetwork = Network.read("testCaseNanInNetPositionComputation.uct", NetworkAreaTest.class.getResourceAsStream("/testCaseNanInNetPositionComputation.uct"));
+        NetworkAreaFactory countryAreaCH = new CountryAreaFactory(Country.CH);
+        NetworkAreaFactory countryAreaIT = new CountryAreaFactory(Country.IT);
+        assertEquals(0, countryAreaCH.create(testNetwork).getNetPosition(), 1e-3);
+        assertEquals(0, countryAreaIT.create(testNetwork).getNetPosition(), 1e-3);
+    }
+
+    @Test
+    void testNetPositionPartOfLineIsZeroWhenLineIsDisconnected() {
+        Network network = Network.read("testCaseSpecialDevices.xiidm", getClass().getResourceAsStream("/testCaseSpecialDevices.xiidm"));
+        network.getLine("LINE_FR_ES").getTerminal1().disconnect();
+        network.getLine("LINE_FR_ES").getTerminal2().disconnect();
+        assertEquals(50, countryAreaFactoryFR.create(network).getNetPosition(), 1e-3);
+        assertEquals(-50, countryAreaFactoryES.create(network).getNetPosition(), 1e-3);
+    }
+
+    @Test
+    void testNetPositionPartOfHvdcIsZeroWhenHvdcIsDisconnected() {
+        Network network = Network.read("testCaseSpecialDevices.xiidm", getClass().getResourceAsStream("/testCaseSpecialDevices.xiidm"));
+        network.getHvdcLine("HVDC_FR_ES").getConverterStation1().getTerminal().disconnect();
+        network.getHvdcLine("HVDC_FR_ES").getConverterStation2().getTerminal().disconnect();
+        assertEquals(50, countryAreaFactoryFR.create(network).getNetPosition(), 1e-3);
+        assertEquals(-50, countryAreaFactoryES.create(network).getNetPosition(), 1e-3);
+    }
 }
diff --git a/balances-adjustment/src/test/java/com/powsybl/balances_adjustment/util/NetworkAreaTest.java b/balances-adjustment/src/test/java/com/powsybl/balances_adjustment/util/NetworkAreaTest.java
index ff7f29e0..5a464f12 100644
--- a/balances-adjustment/src/test/java/com/powsybl/balances_adjustment/util/NetworkAreaTest.java
+++ b/balances-adjustment/src/test/java/com/powsybl/balances_adjustment/util/NetworkAreaTest.java
@@ -8,7 +8,6 @@
 
 import com.powsybl.iidm.network.Country;
 import com.powsybl.iidm.network.Network;
-import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
@@ -18,24 +17,12 @@
  */
 class NetworkAreaTest {
 
-    private Network testNetwork1;
-    private NetworkAreaFactory countryAreaFR;
-
-    private NetworkAreaFactory voltageLevelsArea1;
-
-    @BeforeEach
-    void setUp() {
-        testNetwork1 = Network.read("testCase.xiidm", NetworkAreaTest.class.getResourceAsStream("/testCase.xiidm"));
-
-        voltageLevelsArea1 = new VoltageLevelsAreaFactory("FFR1AA1", "FFR3AA1");
-
-        countryAreaFR = new CountryAreaFactory(Country.FR);
-
-    }
-
     @Test
     void testGetNetPosition() {
-        assertEquals(countryAreaFR.create(testNetwork1).getNetPosition(), voltageLevelsArea1.create(testNetwork1).getNetPosition(), 1e-3);
+        Network testNetwork = Network.read("testCase.xiidm", NetworkAreaTest.class.getResourceAsStream("/testCase.xiidm"));
+        NetworkAreaFactory voltageLevelsArea = new VoltageLevelsAreaFactory("FFR1AA1", "FFR3AA1");
+        NetworkAreaFactory countryAreaFR = new CountryAreaFactory(Country.FR);
+        assertEquals(countryAreaFR.create(testNetwork).getNetPosition(), voltageLevelsArea.create(testNetwork).getNetPosition(), 1e-3);
     }
 
 }
diff --git a/balances-adjustment/src/test/resources/testCaseNanInNetPositionComputation.uct b/balances-adjustment/src/test/resources/testCaseNanInNetPositionComputation.uct
new file mode 100644
index 00000000..31fc9d56
--- /dev/null
+++ b/balances-adjustment/src/test/resources/testCaseNanInNetPositionComputation.uct
@@ -0,0 +1,12 @@
+##C 2007.05.01
+Manually made test case to fix NaN issue in net position computation
+##N
+##ZCH
+S     21              0 0        0.00000 0.00000 0.00000 0.00000
+##ZIT
+I     22              0 0        0.00000 0.00000 0.00000 0.00000
+##ZXX
+X_S_I_21              0 0        0.00000 0.00000 0.00000 0.00000
+##L
+S     21 X_S_I_21 1 8 2.0000 10.000 100.0000   9999
+X_S_I_21 I     22 1 0 2.0000 10.000 100.0000   9999