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Thomas E. Cain

Tom Cain of SAIL Venture Partners, one of the first energy VCs, reflects on his firm's investment criteria and portfolio companies.

Rafael Coven

Public cleantech companies tumbled this past quarter. But less so than other sectors, according to the manager of the CTIUS index.

March 7, 2008 - Exclusive - But industry observers think storing the sun's power every day for 16 hours is a hurdle.Full Story »