'Green' energy companies in Mass.

American Superconductor Corp. Location: Devens Sector: Wind Founded: 1987 Went public: 1991 Employees: 714 as of March 31, 2010 Revenue/investment: $401 million in revenue between April 2010 and 2011 What it does: Designs and builds electrical systems for wind turbines. It also works to improve the reliability, efficiency, and capacity of power grids with renewable energy sources.
Dina Rudick/Globe Staff Photo

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American Superconductor Corp.

Location: Devens
Sector: Wind
Founded: 1987
Went public: 1991
Employees: 714 as of March 31, 2010
Revenue/investment: $401 million in revenue between April 2010 and 2011

What it does: Designs and builds electrical systems for wind turbines. It also works to improve the reliability, efficiency, and capacity of power grids with renewable energy sources.