ArcLight Sells French Wind Assets to AXA Private Equity

BOSTON, July 12, 2010 - ArcLight Capital Partners, LLC ("ArcLight"), through its wholly-owned
French affiliate NeoElectra Group S.A.S. ("NEG") sold its French wind
portfolio to Kallista Energy ("Kallista"), a renewable company owned by AXA
Private Equity Infrastructure Funds ("AXA PE"); AXA PE earlier acquired
Kallista from Babcock & Brown on July 31st 2009. NEG's portfolio consisted of
four wind farms totaling 28.5MW in Brittany: the Plouye wind farm was put
into commercial operation in February 2005 and was powered by Neg Micon NM48,
750 kWs, and the Trebry, Lanfains and Le Haut Corlay wind farms began
commercial operation in January 2006 and operated with Vestas NM64C 1.5MW
wind turbines. NEG sold these assets in order to concentrate on building up
its existing cogeneration and district heating business in France.

About ArcLight Capital Partners, LLC

ArcLight is one of the world's leading energy investment firms with more
than US$6.8 billion under management. ArcLight's investment team has
extensive energy investing experience, industry relationships, and asset
level knowledge. ArcLight is headquartered in Boston, Massachusetts with
offices in New York City, London and Luxembourg. More information about
ArcLight can be found at www.arclightcapital.com.

About AXA Private Equity

AXA Private Equity is a leading private equity firm with US$25 billion in
managed assets and a global reach extending across Europe, North America and
Asia. The firm offers investors the full spectrum of private equity services
for every market segment: direct funds, infrastructure financing, mid cap and
small cap buyouts, venture capital, co-investments, fund of funds as well as
mezzanine financing. More information about AXA Private Equity can be found
at www.axaprivateequity.com.

Daniel Revers, Managing Partner & Co-Founder, or Robb Turner, Senior Partner & Co-Founder, or Heidi Milne, Principal, Investor Relations, all of ArcLight, +1-617-531-6300, info at arclightcapital.com