Gibson Generating Plant. On some monitors you can spot a blackish spot in the upper-left corner of this heavily cropped picture. Once the water vapor dissipates, there does seem to be some "smoke."
Then while driving south on University Parkway near Evansville, IN, I saw another plume. Note that there is two layers of sky, a blue layer over a yellowish layer. And the plume hits a ceiling at the boundary of the layers.
One reason I wanted to go down Green Valley Drive was to see what was on the west side of the railroad with their own unit-train loop of track. But a satellite image lets me identify the types of industry, if not the plant names.
The loop on the far west serves a coal transloading facility. So coal carried by the railroad can either be burned or loaded onto a barge.
After studying a known ethanol plant, the loop in the middle serves an ethanol plant. It has grain trucks unloading, grain bins on the right, fermentation tanks in the lower left, and both covered hopper cars (to unload corn) and many tank cars (to load ethanol) on the loop tracks.