Boardwalk Pipeline Partners, LP : Prices Public Offering of Common Units

Boardwalk Pipeline Partners, LP (NYSE:BWP) (the "Partnership") today announced that it has priced the public offering of 8,000,000 common units at $27.55 per unit. The Partnership expects the offering to close on January 25, 2012. The Partnership has granted the underwriters a 30-day option to purchase up to an additional 1,200,000 common units.

In connection with this offering, the Partnership will receive net proceeds after offering expenses of approximately $217.5 million, including the general partner's proportionate capital contribution of $4.5 million to maintain its 2% general partner interest. The Partnership expects to use the net proceeds from the offering, together with amounts to be contributed by its general partner to maintain its 2% general partner interest, to repay borrowings outstanding under the Partnership's revolving credit facility, but the Partnership may use some or all of the proceeds for other general partnership purposes, which may include acquiring additional equity interests in Boardwalk HP Storage Company, LLC, a joint venture between the Partnership and Boardwalk Pipelines Holding Corp., an affiliate of the Partnership's general partner.

Barclays Capital, BofA Merrill Lynch, Citigroup, J.P. Morgan, UBS Investment Bank and Wells Fargo Securities are acting as joint book-running managers for the common unit offering. A copy of the final prospectus supplement relating to this offering, when available, may be obtained from any of the underwriters, including:

• Barclays Capital, c/o Broadridge Financial Solutions, 1155 Long Island Ave., Edgewood, NY 11717. By telephone at [phone] or by email at [e-mail];
• BofA Merrill Lynch, Attn: Preliminary Prospectus Department, 4 World Financial Center, New York, NY 10080, or email at [e-mail];
• Citigroup, Brooklyn Army Terminal, 140 58th Street, 8th floor, Brooklyn, NY 11220, Attn: Prospectus Dept. By telephone at [phone] or by email at [e-mail];
• J.P. Morgan, c/o Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, New York 11717. By telephone at [phone];
• UBS Investment Bank, Attn: Prospectus Department, 299 Park Avenue, New York, NY 10171. By telephone at (888)-827-7275; or
• Wells Fargo Securities, Attn: Equity Syndicate Dept., 375 Park Avenue, New York, NY 10152. By telephone at [phone] or by email at [e-mail].

This press release does not constitute an offer to sell or a solicitation of an offer to buy any securities nor shall there be any sale of these securities in any state or jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. The offer is being made only through the prospectus supplement and accompanying base prospectus, which is part of a registration statement that became effective on April 29, 2010.

Boardwalk Pipeline Partners, LP, is a limited partnership engaged, through its subsidiaries, in the transportation, storage and gathering of natural gas. Including the assets held under the Petal and Hattiesburg joint venture, the Partnership operates approximately 14,300 miles of pipeline and underground storage fields having aggregate working gas capacity of approximately 186 Bcf.

This press release contains forward-looking statements relating to expectations, plans or prospects for Boardwalk Pipeline Partners, LP and its subsidiaries. These statements are based upon the current expectations and beliefs of management and are subject to certain risks and uncertainties that could cause actual results to differ materially from those described in the forward-looking statements. These risks and uncertainties include market conditions and other factors beyond the company's control and the risk factors and other cautionary statements discussed in Boardwalk's filings with the U.S. Securities and Exchange Commission.

Boardwalk Pipeline Partners, LP
Allison McLean, 866-913-2122
Director of Investor Relations
or
Jamie Buskill, 713-479-8082
Senior VP, Chief Financial Officer and Treasurer