'Green' energy companies in Mass.

Mark Wilson / Globe Staff / File 2008
Boston-Power Inc.
Location: Westborough
Sector: Battery
Founded: 2005
What it does: The company, which makes the Sonata battery used in Hewlett-Packard's notebook computers, aims to deliver dependable power. In addition to the Sonata, Boston-Power also produced the Swing battery for electric vehicles, industrial equipment, and electronic applications.