Congresswoman Niki Tsongas will visit three leading clean energy companies in the Merrimack Valley this Thursday to talk about the importance of alternative fuel sources to America's long-term energy future as well as the economic and job creation benefits that green collar employers bring to the region.  Each of the companies that Tsongas will visit are members of the New England Clean Energy Council and are on the cutting edge of clean energy research and production in their particular field.

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