'Green' energy companies in Mass.

A123 Systems Location: Watertown Sector: Battery/storage Founded: 2001 Went public: 2009 Employees: 2,000 employees worldwide Revenue/investment: $97.3 million in revenue in 2010 What it does: A123 makes powerful and quick-charging batteries using lithium-ion technology. The company has partnership agreements with several car companies that are interested in using the technology for electric vehicles. The company also supplies its lithium-ion battery technology for use in the electric power grid.
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A123 Systems

Location: Watertown
Sector: Battery/storage
Founded: 2001
Went public: 2009
Employees: 2,000 employees worldwide
Revenue/investment: $97.3 million in revenue in 2010

What it does: A123 makes powerful and quick-charging batteries using lithium-ion technology. The company has partnership agreements with several car companies that are interested in using the technology for electric vehicles. The company also supplies its lithium-ion battery technology for use in the electric power grid.