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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

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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