diff --git a/src/micropolisj/engine/Micropolis.java b/src/micropolisj/engine/Micropolis.java
index 18ed33e..d48f3b4 100644
--- a/src/micropolisj/engine/Micropolis.java
+++ b/src/micropolisj/engine/Micropolis.java
@@ -428,6 +428,11 @@ public class Micropolis
 		return map[ypos][xpos];
 	}
 
+	public boolean isTilePowered(int xpos, int ypos)
+	{
+		return (getTile(xpos, ypos) & PWRBIT) == PWRBIT;
+	}
+
 	public void setTile(int xpos, int ypos, char newTile)
 	{
 		if (map[ypos][xpos] != newTile)
diff --git a/src/micropolisj/gui/MicropolisDrawingArea.java b/src/micropolisj/gui/MicropolisDrawingArea.java
index 14547ce..d19d911 100644
--- a/src/micropolisj/gui/MicropolisDrawingArea.java
+++ b/src/micropolisj/gui/MicropolisDrawingArea.java
@@ -182,7 +182,7 @@ public class MicropolisDrawingArea extends JComponent
 				int cell = m.getTile(x,y);
 				if (blinkUnpoweredZones &&
 					isZoneCenter(cell) &&
-					(cell & PWRBIT) == 0)
+					!m.isTilePowered(x, y))
 				{
 					unpoweredZones.add(new Point(x,y));
 					if (blink)