It is difficult, though not so much in the actual retrofitting but in obtaining a license and the funding necessary to retrofit the dams. Hydroelectricity also does not command as much mainstream attention, which makes it harder to gather support to retrofit the 97 percent of non-power generating dams. For a very long and detailed survey of dams with retrofit potential, you can see: http://www.usbr.gov/power/data/1834/Sec1834_EPA.pdf.
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