diff --git a/class_diagram_custom.plantuml b/class_diagram_custom.plantuml
index 52070fd..878235f 100644
--- a/class_diagram_custom.plantuml
+++ b/class_diagram_custom.plantuml
@@ -28,6 +28,7 @@ class "carTemplate" {
 
 class "powerGrid" {
   energieAvailable : int
+  savedEnergie : int
 }
 
 "carGrid" --> "*" "car" : dockedCars
diff --git a/src/main/java/de/mrgeorgen/v2g/car.java b/src/main/java/de/mrgeorgen/v2g/car.java
index 75dfbf7..ae25e8d 100644
--- a/src/main/java/de/mrgeorgen/v2g/car.java
+++ b/src/main/java/de/mrgeorgen/v2g/car.java
@@ -24,8 +24,9 @@ public class car {
 		if(chargeAmmount != 0) System.out.println(this.model + " nr. " + this.id + " is " + (chargeAmmount < 0 ? "dis" : "") + "charging with " + (double)Math.abs(chargeAmmount) / 1000 +  " kW. battery: " + (double)this.battery / 1000 + "/" + (double)this.fullBattery / 1000 + " kWh (" + Math.round(getBatteryRelativ() * 100) + "%)");
 		this.battery += chargeAmmount;
 		powerGrid.energieAvailable -= chargeAmmount;
+		if(chargeAmmount < 0) powerGrid.savedEnergie += Math.abs(chargeAmmount);
     	}
-	public void setChargeLock(double chargeLock) {
+	private void setChargeLock(double chargeLock) {
 		this.chargeLock = (int)(this.fullBattery * chargeLock);
 	}
 	public double getBatteryRelativ() {
diff --git a/src/main/java/de/mrgeorgen/v2g/powerGrid.java b/src/main/java/de/mrgeorgen/v2g/powerGrid.java
index 09f9adf..5cf9755 100644
--- a/src/main/java/de/mrgeorgen/v2g/powerGrid.java
+++ b/src/main/java/de/mrgeorgen/v2g/powerGrid.java
@@ -2,12 +2,13 @@ package de.mrgeorgen.v2g;
 import java.util.Random;
 public class powerGrid {
 	public static int energieAvailable;
+	public static int savedEnergie;
 	public static void main(String args[]) {
-		final carGrid carGrid = new carGrid();
 		if(args.length != 1) {
 			System.out.println("Invalid Syntax. Use the number of days the simulation shell run as the first argument");
 			return;
 		}
+		final carGrid carGrid = new carGrid();
 		carGrid.fillWithCars();
 		final int hourSimulationRuns = Integer.parseInt(args[0]) * 24;
 		Random random = new Random();
@@ -22,5 +23,6 @@ public class powerGrid {
 			energieAvailable = (int)(averageEnergie * (0.5 + 1.5 * random.nextDouble()));
 			carGrid.chargeCars();
 		}
+		System.out.println("vehicle to grid saved " + (double)savedEnergie / 1000 + " kWh with " + carGrid.dockedCars.size() + " cars");
 	}
 }