NYSE Arca Welcomes Constellation Energy Partners LLC as 2nd IPO since Launch Early This Year.

20(th) Exclusive NYSE Arca Listing on New Platform for Emerging Issuers

21st Energy Company Listing on NYSE Group in 2006

NEW YORK -- Today, NYSE Arca(sm) welcomed Constellation Energy Partners LLC (NYSE Arca: CEP) as its 2(nd) IPO since launching its new listing platform for emerging issuers early this year.

Constellation Energy Partners, which raised $94.5 million in its NYSE Arca IPO, is the 20th exclusive listing on NYSE Arca year-to-date. Constellation Energy Partners priced 4.5 million of its common units representing Class B limited liability company interests at the top end of the range, $21 per common unit. Completion of the offering is expected to occur on Nov. 20, 2006.

Constellation Energy Partners is a limited liability company that was formed in February 2005 by Constellation Energy Group, Inc. (NYSE: CEG). It is an energy company focused on the acquisition, development and exploitation of oil and natural gas properties, as well as related midstream assets. Its assets consist primarily of producing and non-producing coalbed methane natural gas reserves located in the RobinsoneIUs Bend Field in the Black Warrior Basin of Alabama. Constellation Energy Partners joins the NYSE Group as the 21st energy company listing in 2006. The total market capitalization for all NYSE Group energy listings to more than $3.1 trillion.

Based on market capitalization, more than 96% of the qualified domestic energy-related stocks are currently listed on NYSE Group, where energy company listings represent a total market capitalization of more than $3.1 trillion.

Energy company listings on NYSE Group in 2006 include Helix Energy Solutions (NYSE: HLX) with a market cap of $3.04 billion; Penn West Energy Trust (NYSE: PWE) with a market cap of $6.1 billion; CNX Gas Corporation (NYSE: CXG) with a market cap of $4.1 billion and VAALCO Energy, Inc.

About NYSE Arca(SM):

NYSE Arca (formerly ArcaEx) is a fully electronic stock exchange that provides an open and fair market for emerging companies. NYSE ArcaeIUs broader eligibility requirements allow smaller companies that do not yet meet New York Stock Exchange listings standards to join the NYSE Group of listed companieseIand ultimately gain visibility opportunities and investor access not previously available to them. Among the first companies exclusively listed on this new platform: Darwin Professional Underwriters (NYSE Arca: DR) which joined NYSE Arca as an IPO in May; BFC Financial Group (NYSE Arca: BFF) which joined as the first transfer from Nasdaq; Evergreen Energy Inc. (NYSE: EEE) which joined as the first transfer from American Stock Exchange; and 15 exchange traded funds (ETFs) listed on NYSE Arca in October when Barclays Global Investors (BGI), a worldwide leader in ETFs, transferred the listings of its iShares ETFs from the AMEX.

In the NYSE Arca market model, listed issuers participate in the selection of a "Lead Market Maker" responsible for maintaining tight spreads and providing the opportunity for price improvement. NYSE Arca has captured a 21% (in the third quarter of 2006) of trading in Nasdaq stocks by providing excellent market quality, as measured by its superior effective spreads and speed, a 2.8% increase from the previous year.

NYSE Arca listing standards extend the NYSEeIUs current focus on providing a listing and trading venue for quality companies.

Background:

* Growth companies have the opportunity to list on NYSE Group for the first time on NYSE Arca. This gives issuers eI both domestic as well as non-US companies -- an alternative listing venue, while enabling NYSE Group to compete for smaller-sized companies that previously did not qualify for the NYSE.

* On June 8, 2006, NYSE Arca achieved a new all-time record in daily trading volume with 1.49 billion shares traded, representing $55.0 billion. On April 27, NYSE Arca volume surpassed 1.0 billion shares traded for the first time. Including this milestone, NYSE Arca volume exceeded 1 billion shares 13 times during the second quarter.

* NYSE Arca companies participate in a selection of a "Lead Market Maker" responsible for maintaining depth and quality of trading in the stock. The "Lead Market Maker" brokerage firm has quote and execution obligations and the responsibility for keeping tight spreads in the stock eI resulting in the superior market quality that issues have come to expect.

* Once they qualify, NYSE Arca-listed companies are able to seamlessly move into the full NYSE listing as theyeIUre already part of the NYSE Group family of listed companies. Companies transferring their listing to the New York Stock Exchange from NYSE Arca will not pay an initial listing fee following an NYSE Group Inc. (NYSE: NYX) rule filing approved by the U.S. Securities and Exchange Commission in July.E[sz]Companies transferring to the NYSE from NYSE Arca also willE[sz]not be subject to a prorated annual fee for the first partial calendar year.

About NYSE Group, Inc.

NYSE Group, Inc. (NYSE:NYX) operates two securities exchanges: the New York Stock Exchange (the "NYSE") and NYSE Arca, Inc. (formerly known as the Archipelago Exchange, or ArcaExE1/2, and the Pacific Exchange). NYSE Group is a leading provider of securities listing, trading and market data products and services. In the third quarter of 2006, on an average trading day, 2.2 billion shares, valued at $80.1 billion, were traded on the exchanges of the NYSE Group.

The NYSE is the worldeIUs largest and most liquid cash equities exchange. The NYSE provides a reliable, orderly, liquid and efficient marketplace where investors buy and sell listed companieseIU common stock and other securities. On September 30, 2006, the operating companies listed on the NYSE represented a total global market capitalization of $23.0 trillion.

NYSE Arca operates NYSE Arca, Inc., the first open, all-electronic stock exchange in the United States , and has a leading position in trading exchange-traded funds and exchange-listed securities. NYSE Arca, Inc. is also an exchange for trading equity options. NYSE ArcaeIUs trading platforms provide customers with fast electronic execution and open, direct and anonymous market access.

NYSE Regulation, an independent not-for-profit subsidiary, regulates member organizations through the enforcement of marketplace rules and federal securities laws. NYSE Regulation also ensures that companies listed on the NYSE and NYSE Arca meet their financial and corporate governance listing standards.

For more information on NYSE Group, go to: www.nyse.com.