'Green' energy companies in Mass.

Dina Rudick / Globe Staff / File 2008
Conservation Services Group
Location: Westborough
Sector: Energy-efficiency
Founded: 1984
What it does: A nonprofit organization that runs energy-efficiency programs, it serves clients including National Grid, San Diego Gas & Electric, and the Energy Trust of Oregon. Its goal is to develop energy efficiency for energy program administrators, builders and contractors, and residential and commercial groups.