Riverstone Completes Acquisition of Seajacks International, A Leading Offshore Wind Services Company

NEW YORK, January 21 - Riverstone Holdings LLC's ("Riverstone") most recent renewable energy
fund has successfully completed its previously announced acquisition of
Seajacks International ("Seajacks"), for a total cash consideration of US$207
million.

Seajacks is now wholly-owned by Riverstone and the management team.

Seajacks currently owns and operates two self-propelled jack up vessels
out of Great Yarmouth in the United Kingdom: the Seajacks Kraken and Seajacks
Leviathan. Both vessels are purpose built for installing offshore wind
turbines, as well as being able to perform a number of niche operations for
the North Sea oil and gas industry.

Seajacks Kraken is currently on contract to TAQA carrying out gas field
service work and will shortly commence a 15 month contract for DONG Energy to
install turbines at the Walney offshore wind farm, located in the Irish Sea.
Seajacks Leviathan is currently on a 15 month contract with Fluor to provide
installation services at Greater Gabbard, one of the world's largest wind
farms under construction off the Kent coast.

Riverstone plans to grow Seajacks into a leading European offshore wind
service business, with an operational base in the United Kingdom. The initial
focus will be on expanding the current fleet of vessels to service the
rapidly expanding market for turbine installation and maintenance. Riverstone
expects to devote a substantial amount of new capital for this purpose.

Blair Ainslie, Managing Director of Seajacks, said, "We believe that with
Riverstone's knowledge, expertise and substantial financial resources,
Seajacks will to be able to grow our business footprint, creating new jobs
and helping the UK and other European governments meet their ambitious
offshore wind targets. We particularly look forward to playing a significant
role in the development of the UK Round 3 sites, which are expected to
represent in excess of 100 billion pounds of investment."

Robin Duggan, Principal of Riverstone, said, "We are impressed with the
track record of the Seajacks management team. The company has delivered two
purpose built vessels on time and on budget, successfully secured contracts
with both offshore wind and oil & gas customers and created a number of
skilled jobs. Our ambition is for Seajacks to be the leading UK-based
provider of offshore wind installation and maintenance services to the
European market, a sector poised for rapid expansion, and to provide focused
support services to the North Sea oil and gas industry."

Pierre Lapeyre and David Leuschen, Co-Founders of Riverstone said, "We
are extremely committed to our investment strategy in the renewable sector
and believe that the offshore wind service sector will be an area of
considerable growth in that space. In Seajacks management, we've found an
ideal partner with the experience and vision to help us participate in that
growth."

About Riverstone Holdings LLC

Riverstone Holdings LLC, an energy and power-focused private equity firm
founded in 2000, has approximately US$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 approximately US$12.7 billion to 64 investments in North
America, Latin America, Europe and Asia. For more information, visit
www.riverstonellc.com.

Contacts: Riverstone Holdings LLC

    Jeffrey Taufield/Michael Freitag
    Kekst and Company
    +1-212-521-4800
    jeffrey-taufield@kekst.com
    michael-freitag@kekst.com

Jeffrey Taufield, jeffrey-taufield at kekst.com or Michael Freitag, michael-freitag at kekst.com, +1-212-521-4800, Kekst and Company for Riverstone Holdings LLC