diff --git a/src/main/scala/edu/ie3/simona/model/thermal/ThermalGrid.scala b/src/main/scala/edu/ie3/simona/model/thermal/ThermalGrid.scala
index 5d15eac4b3..faf40980db 100644
--- a/src/main/scala/edu/ie3/simona/model/thermal/ThermalGrid.scala
+++ b/src/main/scala/edu/ie3/simona/model/thermal/ThermalGrid.scala
@@ -851,7 +851,7 @@ object ThermalGrid {
 
     def hasRequiredDemand: Boolean = required > zeroMWh
 
-    def hasAdditionalDemand: Boolean = possible > zeroMWh
+    def hasAdditionalDemand: Boolean = possible > required
   }
   object ThermalEnergyDemand {
 
@@ -872,10 +872,15 @@ object ThermalGrid {
         math.abs(possible.toKilowattHours) < math.abs(required.toKilowattHours)
       )
         throw new InvalidParameterException(
-          s"The possible amount of energy {$possible} is smaller than the required amount of energy {$required}. This is not supported."
+          s"The possible amount of energy $possible is smaller than the required amount of energy $required. This is not supported."
         )
-      else
-        new ThermalEnergyDemand(required, possible)
+
+      if (possible.toKilowattHours < 0 || required.toKilowattHours < 0)
+        throw new InvalidParameterException(
+          s"The possible $possible or required $required amount of energy cannot be negative. This is not supported."
+        )
+
+      new ThermalEnergyDemand(required, possible)
     }
 
     def noDemand: ThermalEnergyDemand = ThermalEnergyDemand(
diff --git a/src/test/scala/edu/ie3/simona/model/thermal/ThermalGridSpec.scala b/src/test/scala/edu/ie3/simona/model/thermal/ThermalGridSpec.scala
index cb09b2bb80..089f1630e5 100644
--- a/src/test/scala/edu/ie3/simona/model/thermal/ThermalGridSpec.scala
+++ b/src/test/scala/edu/ie3/simona/model/thermal/ThermalGridSpec.scala
@@ -6,6 +6,7 @@
 
 package edu.ie3.simona.model.thermal
 
+import edu.ie3.simona.exceptions.InvalidParameterException
 import edu.ie3.datamodel.models.input.thermal.ThermalStorageInput
 import edu.ie3.simona.exceptions.InvalidParameterException
 import edu.ie3.simona.model.thermal.ThermalGrid.ThermalEnergyDemand
@@ -27,7 +28,7 @@ class ThermalGridSpec
 
   "Testing the thermal energy demand" when {
     "instantiating it from given values" should {
-      "throw exception for non-plausible input (positive)" in {
+      "throw exception for non-sensible input (positive)" in {
         val possible = MegawattHours(40d)
         val required = MegawattHours(42d)
 
@@ -36,15 +37,6 @@ class ThermalGridSpec
         }.getMessage shouldBe s"The possible amount of energy {$possible} is smaller than the required amount of energy {$required}. This is not supported."
       }
 
-      "throw exception for non-sensible input (negative)" in {
-        val possible = MegawattHours(-40d)
-        val required = MegawattHours(-42d)
-
-        intercept[InvalidParameterException] {
-          ThermalEnergyDemand(required, possible)
-        }.getMessage shouldBe s"The possible amount of energy {$possible} is smaller than the required amount of energy {$required}. This is not supported."
-      }
-
       "set the correct values, if they are sensible" in {
         val possible = MegawattHours(45d)
         val required = MegawattHours(42d)
@@ -92,6 +84,30 @@ class ThermalGridSpec
         }.getMessage shouldBe s"The possible amount of energy {$possible} is smaller than the required amount of energy {$required}. This is not supported."
       }
 
+      "throw exception, if required demand is smaller than zero" in {
+        val required = MegawattHours(-2d)
+        val possible = MegawattHours(5d)
+        intercept[InvalidParameterException] {
+          ThermalEnergyDemand(required, possible)
+        }.getMessage shouldBe s"The possible {$possible} or required {$required} amount of energy is smaller than zero. This is not supported."
+      }
+
+      "throw exception, if possible demand is smaller than zero" in {
+        val required = MegawattHours(2d)
+        val possible = MegawattHours(-5d)
+        intercept[InvalidParameterException] {
+          ThermalEnergyDemand(required, possible)
+        }.getMessage shouldBe s"The possible {$possible} or required {$required} amount of energy is smaller than zero. This is not supported."
+      }
+
+      "throw exception, if possible and required demand are smaller than zero" in {
+        val required = MegawattHours(-2d)
+        val possible = MegawattHours(-5d)
+        intercept[InvalidParameterException] {
+          ThermalEnergyDemand(required, possible)
+        }.getMessage shouldBe s"The possible {$possible} or required {$required} amount of energy is smaller than zero. This is not supported."
+      }
+
       "return proper information, if required and additional demand is apparent" in {
         val required = MegawattHours(45d)
         val possible = MegawattHours(47d)