Originally Posted by GreatestAlive

Well, somebody with a lot of influence obviously didnt want the power plants to be bombed. And what if the Germans had power plants the Allies didnt know about? The known power plants would be destroyed, but if power plants the Allies didnt know about still existed, then the who point of destroying those power plants would have been pointless and much time would be wasted.

I disagree, Perseus actually answered his own question... "Germany’s power grid was much more vulnerable than realized" clearly the Allies felt it was far less vulnerable than it actually was and therefore felt resources were better spent elsewhere.

If you look at the Dam Busters raids you will see that that despite the immediate damage and industrial disruption production was back up and running very quickly, this probably led the Allies to believe that the power grid was more robust than it was.

There is also the fact that large numbers of Germany's crucial factories had there own power supply and while taking down the grid may have had an effect in the short term production could still continue.

There we go, the possible explanation as to why.