Analysis of an experimental tidal turbine in Washington state recorded no collisions with seals or birds. Underwater turbines could ultimately provide clean energy to over 20 million U.S. homes, the Energy Department says.By Johnny SturgeonAt the narrow entrance to Sequim Bay’s tidal channel, an underwater, four-bladed turbine spinning above the seabed might look like a hazard. But here, in Washington state, underwater acoustic cameras bring to life a different story: Schools of Pacific herring swim through the rotors; harbor seals stop and curiously approach; diving cormorants instinctively steer clear. 

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