PAA Natural Gas Storage, L.P. (NYSE: PNG) announced today that it has set the close of business on Monday, November 25, 2013 as the record date for determining common unitholders entitled to receive notice of, and to vote at, a special meeting to be held on Tuesday, December 31, 2013 to consider a proposal to approve the proposed merger (the “Merger”) between PNG and a subsidiary of Plains All American Pipeline, L.P. (NYSE: PAA), contemplated by the previously announced merger agreement dated October 21, 2013 between PNG and PAA. This communication does not constitute an offer to sell any securities. Any such offer will be made only by means of a prospectus forming a part of an effective registration statement filed with the Securities and Exchange Commission. In connection with the proposed Merger, a registration statement of PAA, which includes a preliminary proxy statement and a prospectus of PAA, and other materials have been filed with the Securities and Exchange Commission. Investors and security holders are urged to carefully read the documents filed with the Securities and Exchange Commission regarding the proposed transaction when they become available, because they contain important information about PAA, PNG and the proposed Merger. A definitive proxy statement/prospectus will be sent to unitholders of PNG seeking their approvals as contemplated by the Merger Agreement. When available, investors and security holders may obtain a free copy of the definitive proxy statement/prospectus and other documents containing information about PAA and PNG, without charge, at the Securities and Exchange Commission's website at www.sec.gov. PAA, PNG and certain of their respective directors and executive officers may be deemed to be participants in the solicitation of proxies from the unitholders of PNG in connection with the proposed transaction. Information about the directors and executive officers of the general partner of PAA is set forth in PAA's Annual Report on Form 10-K for the year ended December 31, 2012, which was filed with the Securities and Exchange Commission on February 27, 2013. Information about the directors and executive officers of the general partner of PNG is set forth in PNG's Annual Report on Form 10-K for the year ended December 31, 2012, which was filed with the Securities and Exchange Commission on February 27, 2013. These documents can be obtained without charge at the Securities and Exchange Commission's website indicated above. Additional information regarding the interests of these participants may be obtained by reading the proxy statement/prospectus regarding the proposed transaction.