But some scrubbers are having unexpected problems with corrosion, according to this article in the Columbus Dispatch. Read the whole thing, as they say. Here in the Ohio Valley, our residential electric bills have gone up in part to pay for scrubbers. I'm on the AEP system, and it looks like AEP's biggest plants don't have the corrosion problem, but the Mountaineer plant does. Mountaineer is notable because it's the pilot plant for the underground carbon dioxide sequestration experiment.
Not every coal-burning plant in my part of the valley has scrubbers. AEP has decided to mothball some plants ahead of schedule because they're sold old and so small that spending millions or billions on scrubbers cannot be justified from a business standpoint.
This is the Mountaineer plant on a December day. The plant is in Mason County, W.Va., near the townof New Haven. This was taken from Meigs County, Ohio, near the village of Racine.
UPDATE: Here is the article from the EPRI Journal on which the Dispatch article was based.