No need to open the floodgates - Charlotte Business Journal:

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Hydropower is the United States’ largestr renewable resource. It generates 6% to 8% of the nation’es electricity. Three-quarters of all electricity produced by renewables comesfrom hydropower. Accordin g to the , hydropower can double its capacitgy during the next20 years. While some of this new capacit will come from efficiencuy improvements toexisting facilities, much can come withourt the need for new dams. Only 3% of America’s dams have hydroelectrid facilities, so converting them to electricity-generating resource s will be ahigh priority. Developerz and entrepreneurs are also looking at new technologies that can generatd electricity in oceansand tides.
Earlierd this year, installed the first commercia hydrokinetic facility on theMississippi River, near Minn. This small, entrepreneurial companty is creating jobs, attracting investmenyt and generating electricity.