1) the Germans had electrical power back up relatively soon after.
2)1600 people were killed by the flood. 1000 of them were allied POWs.
This operation was not the kind of success that bomber command had hoped for.
As Mr Spock once said, "the needs of the many outweigh the needs of the few".
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Be careful when reading up on "revisionist" history. It can leave many important details out.
Yes, the dams were repaired in a span of five months. But what's not mentioned is the amount of materials and labour that was required to get the job done, materials and labour that were diverted away from other major projects including building the Atlantic Coast defense walls along France. It's because of the holes left in the Normandie coast that the D-Day Invasion was as successful as it was.
Also, during the five month repair job, all of the reservoirs had to be drained to make repairs, then had to be refilled after the repairs were done. That meant hardly any of the factories in the area were capable of running at full production, severely depleting the German nation's weapon reserves, weapons that would have been very useful during many battles.
Even the Sorpe dam which was only slightly damaged in the raid still needed to have its reservoir emptied in order to make repairs.
Finally, a second raid may not have been possible since the element of surprise was gone. The Germans were now familiar with the bouncing bombs, and had implemented modifications to their defenses to keep the bombs away from the dams.
Operation Chastise accomplished all of the mission objectives.