Continental Gas Storage BV Announces Entry Into Agreement to Sell Its Subsidiary Continental Gas Storage Deutschland GmbH to Haddington Ventures, L.L.C.

DEN HAAG, The Netherlands, February 9, 2011 - Continental Gas Storage BV (CGS) is pleased to announce that it has
entered into an exclusive agreement with Haddington Ventures, L.L.C. of
Houston, Texas, USA, to sell the Company's wholly-owned subsidiary,
Continental Gas Storage Deutschland GmbH (CGSD), to Haddington Energy
Partners IV LP, a fund managed by Haddington.

The proposed Transaction is subject to further due diligence by
Haddington and is expected to close by midyear 2011. Once closed, the
Transaction will enable the continued development and construction of the
Company's Epe Underground Natural Gas Storage project, located in Germany.

Haddington is a leading private equity firm, active in the midstream
energy business sector. The Fund generally makes control-oriented investments
in companies focused on gathering, separation, processing, treating,
compression, storage, and transmission of oil and natural gas. Haddington is
a truly unique organization as a midstream energy fund manager with
principals and investment professionals possessing substantial direct
operating experience. As such, the Fund is capable of investing in both
operating enterprises with growth potential and green-field development
opportunities. This capability allows Haddington to capitalize on current
market conditions in the midstream energy sector globally. For more
information, please visit www.hvllc.com.

Continental Gas Storage (www.continentalgasstorage.com) was
established to provide non-integrated flexible gas storage and services to
customers such as gas producers, power producers, natural gas distribution
companies and large end users of natural gas. CGS aims to convert nine salt
caverns into an underground natural gas storage facility in four phases to
provide its customers with effective third-party access to flexible storage
services. The salt caverns are ideally located in Northwest Europe in
Germany. The caverns are planned to be developed in multiple phases and all
nine caverns are expected to be on-line by 2019. We envisage to reach maximum
capacity of approximately 644 million cubic meters (mcm), 25 billion cubic
feet (Bcf), of working storage capacity by 2020 with all nine caverns in
commercial operations. The initial investment is estimated to be in the order
of euro 310,000,000 (US$410,000,000), including acquisitions, financing and
construction costs, for a total working gas volume of approximately 261 mcm
(10.1 Bcf). The final plant expansions are envisaged to be completed by 2018
with additional investment of approximately euro 200,000,000 (US$270,000,000)
for 383 mcm (14.9 Bcf) of additional working gas capacity.

Haddington Managing Director, J. Chris Jones stated: "We are very pleased
with our engagement with Continental Gas Storage. It is our strong desire to
participate in the European midstream energy markets, and we are very happy
to be a potential partner with users of and suppliers to the natural gas
storage market participants in Europe. In addition, we feel privileged to be
associated with high-quality companies as counterparts. Haddington and its
principals have developed, or are developing, in excess of 131 Bcf of
high-deliverability gas storage projects at five different locations
throughout the United States since 1989. We look forward to combining our
historical expertise with the outstanding talent at CGS and to building the
first independently owned and operated gas storage project in the European
Union."

"We believe, with our continued collaboration with Haddington, our Epe
Project has gained further momentum towards realization. It is our strong
intent to work very closely with our advisors, contractors and counterparts
to move the Epe Project forward to construction in the near term," said
Bertan Atalay, Managing Director & CEO.

Bertan Atalay, P.Eng., MBA, Managing Director & CEO in Den Haag, the Netherlands, +31-(0)70-31-15-980, for Continental Gas Storage BV and Continental Gas Storage Deutschland GmbH