Nearly 3 times the "normal" flow for one year due to flooding. While the Lake of the Ozarks suffered no direct effects of the surrounding waters, over 37% of operational time was spent in maximum turbine flow conditions. How much of that interpolated into power generation, only Ameren knows, but it was there for the taking.
Here's how December itself looked on the daily candlestick graph.
And the hourly detail.
And finally we can now see the daily candlestick graph for the entire year. (click any image to enlarge)
And the monthly summary version
