Riverstone Acquires Babcock & Brown's North American Energy Group

Ecogen gets new parent ownership

SAN FRANCISCO, June 25, 2009 /PRNewswire via COMTEX/ -- Riverstone Holdings LLC and the management team of Babcock & Brown's North American Energy Group today jointly announced the purchase of the wind development portfolio from Babcock & Brown LP to form Pattern Energy Group LP ("Pattern Energy"). Pattern Energy is one of the most experienced and best-capitalized development companies in the U.S. renewable energy and transmission industry. Pattern Energy is an independent, fully integrated energy company that develops, constructs, owns, and operates renewable energy and transmission assets across North America and parts of Latin America. Riverstone is providing the capital required to expand and support Pattern Energy's renewable energy business, which will be an important growth platform for Riverstone in North America.

Pattern Energy retains the Babcock & Brown North American energy development team, which has successfully developed, financed and placed into operation 2,000 MW of wind power across 11 states. Pattern Energy also maintains the current Babcock & Brown development pipeline that exceeds 4,000 MW of wind power in 11 states and 4 countries in addition to several power transmission projects.

Riverstone, an energy and power-focused private equity firm with the world's largest renewable energy private equity fund, is committing $400 million to expand and support Pattern Energy's renewable energy business.

"Our team of highly-experienced renewable energy and transmission experts is excited about continuing our business as the new and well capitalized Pattern Energy," said Mike Garland, Chief Executive Officer of Pattern Energy. "Pattern Energy will continue using our in-depth industry experience, combined with innovation and science, to deliver the utmost value for our partners and the communities where we work. The combination of experience, capital, and opportunities create a tremendous outlook for our company."

"Pattern Energy will continue to be on the leading edge of developing efficient financial structures for renewable energy and transmission projects," said Hunter Armistead, Executive Director of Pattern Energy. "It is exciting to be well capitalized in this current market, which puts the company in a terrific position to grow. We look forward to continuing to develop premier renewable energy projects."

"We are highly impressed with the extensive renewable energy and transmission experience of the Pattern Energy team and are fully committed to Pattern," said Chris Hunt, Managing Director of Riverstone Holdings. "We welcome the Pattern Energy team as an important new part of our renewable energy platform in North America."

About Pattern Energy Group LP

Pattern is an independent, fully integrated energy company that develops, constructs, owns and operates renewable and transmission energy assets across North America and parts of Latin America. Formerly Babcock & Brown LP's thriving North American energy group, Pattern employs 80 employees, located in four offices (San Francisco, Houston, San Diego and New York), which successfully developed, financed and placed into operation over 2,000 MW of wind power across 11 states. Pattern has a current development pipeline that exceeds 4,000 MW of wind energy and transmission projects in 11 states and 4 countries. Pattern is dedicated to delivering the highest values for our partners and the communities in which we work, while exhibiting a strong commitment to promoting environmental stewardship and corporate responsibility.

About Riverstone Holdings LLC

Riverstone Holdings LLC, an energy and power-focused private equity firm founded in 2000, has approximately $17 billion under management across six investment funds, including the world's largest renewable energy fund. Riverstone conducts buyout and growth capital investments in the midstream, exploration & production, oilfield services, power and renewable sectors of the energy industry. With offices in New York, London and Houston, the firm has committed over $12 billion to 60 investments in North America, Latin America, Europe and Asia. For more information, visit www.riverstonellc.com.