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By Terhi Kinnunen PYHAJOKI, Finland (Reuters) - Matti Pahkala braces from the chilly winds blowing from the Gulf of Bothnia as he surveys a map of the Hanhikivi peninsula in northern Finland, an area he first visited as a child.

For Douglas Meffert, those attempting to harness the water power of the Mississippi River aren't just scientists and engineers; they're visionaries who could transform the way power grids operate in the Southeast, and perhaps other areas of the United States. Meffert, a professor of bioenvironmental research at Tulane University, said that with his work, he's carrying on the mission of the late professor William Mouton, a revered New Orleans structural engineer, to end the southeastern United States' reliance on fossil-fuel energy from the Gulf of Mexico.