BreitBurn Energy Partners L.P. (the “Partnership”) (NASDAQ:BBEP) announced today that it has commenced a public offering, subject to market and other conditions, of 13,000,000 common units representing limited partner interests in the Partnership. The Partnership intends to grant the underwriters a 30-day option to purchase up to an additional 1,950,000 common units. The Partnership intends to use the net proceeds from the offering to repay indebtedness outstanding under its existing revolving credit facility. Barclays, BofA Merrill Lynch, Citigroup, RBC Capital Markets, UBS Investment Bank and Wells Fargo Securities will act as joint book-running managers of the offering. When available, a copy of the preliminary prospectus supplement and accompanying prospectus relating to the offering may be obtained from: Barclaysc/o Broadridge Financial Solutions1155 Long Island AvenueEdgewood, New York 11717Phone: (888) 603-5847 firstname.lastname@example.org BofA Merrill LynchAttn: Prospectus Department222 BroadwayNew York, New York 10038 email@example.com Citigroupc/o Broadridge Financial Solutions1155 Long Island AvenueEdgewood, New York 11717Phone: (800) 831-9146 firstname.lastname@example.org RBC Capital MarketsThree World Financial Center200 Vesey Street, 8th FloorNew York, New York 10281-8098Attention: Equity SyndicatePhone: (877) 822-4089 UBS Investment BankAttn: Prospectus Dept.299 Park AvenueNew York, New York 10171Phone: (888) 827-7275 Wells Fargo SecuritiesAttn: Equity Syndicate Dept.375 Park AvenueNew York, New York 10152Phone: (800) 326-5897 email@example.com An electronic copy of the preliminary prospectus supplement and accompanying base prospectus may also be obtained at no charge at the Securities and Exchange Commission’s website at www.sec.gov. This press release does not constitute an offer to sell or the solicitation of an offer to buy the securities described herein, nor shall there be any sale of these securities in any 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 offering may be made only by means of a prospectus and prospectus supplement meeting the requirements of Section 10 of the Securities Act of 1933, as amended. The offering will be made pursuant to an effective shelf registration statement, which was previously filed by the Partnership with the Securities and Exchange Commission, and a prospectus supplement and accompanying prospectus, which will be filed by the Partnership with the Securities and Exchange Commission.