Looking at the dam itself we can still see 3 of the "rake gates" open partially, indicating some flow over the spillways, but overall flow seems point too reduced power generation. It's an odd configuration with flood gates partially open, and power generation low, but I suspect the goal is to get surface currents moving to get some of debris out of the water. The lake has had a lot of organic debris in it all summer. Here's the candlestick graph.
And the hourly detail graph for those interested...
and the monthly summary candlestick. So much water!