Tidal Power

  FILE - In this June 13, 2011 file photo, the Energy Tide 2, the largest tidal energy turbine ever deployed in the U.S., appears on a barge in Portland, Maine. The Maine Public Utilities Commission, on Tuesday, April 24, 2012, set contract terms and directed three utilities to negotiate with the company, Ocean Renewable Power Co., to put electricity onto the grid this summer. (AP Photo/Robert F. Bukaty/file)
FILE - In this June 13, 2011 file photo, the Energy Tide 2, the largest tidal energy turbine ever deployed in the U.S., appears on a barge in Portland, Maine. The Maine Public Utilities Commission, on Tuesday, April 24, 2012, set contract terms and directed three utilities to negotiate with the company, Ocean Renewable Power Co., to put electricity onto the grid this summer. (AP Photo/Robert F. Bukaty/file)

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