This photo taken Tuesday, May 12, 2015, shows the head waters of the St. Clair River where Vortex Hydro Energy will be installing energy-harnessing devices this summer in the water near Dunn Paper in Port Huron, Mich. The company has studied harnessing the St. Clair River’s current to produce electricity. (Liz Shepard/The Port Huron Times Herald via AP) NO SALES
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