Mascoma Cellulosic Ethanol Plant Begins Operations in Rome, NY

News Release

Facility Generating Biomass-based Ethanol With Assistance from New York State Agencies

Boston, MA – February 25, 2009: Mascoma Corporation, a leader in the development
of low carbon cellulosic ethanol, today announced that the company’s demonstration
facility in Rome, New York, is now producing ethanol from non-food cellulosic biomass.

“This is an important milestone for the cellulosic ethanol industry and for Mascoma. We
are grateful for the support NYSERDA and NYPA have provided for the past two years,”
said Bruce A. Jamerson, CEO of Mascoma Corporation. “They have been outstanding
partners and we couldn’t have built this plant without them.”

Read the news release