HOUSTON, TEXAS--(Marketwired - May 22, 2013) - TC PipeLines, LP (NYSE:TCP) (the Partnership) today announced the closing of its previously announced public offering of 8,855,000 common units, including 1,155,000 common units purchased pursuant to the full exercise of the underwriter's option to purchase additional common units. The offering was priced at $43.85 per common unit.

Net proceeds from the offering will be used by the Partnership to partially fund its previously announced acquisition of an additional 45 percent interest in each of Gas Transmission Northwest LLC and Bison Pipeline LLC from subsidiaries of TransCanada Corporation (TSX:TRP) (NYSE:TRP) (TransCanada). With the close of the equity offering, TransCanada's ownership in the Partnership is now 28.9 percent.

Wells Fargo Securities, BofA Merrill Lynch, J.P. Morgan, Morgan Stanley, UBS Investment Bank, Deutsche Bank Securities and RBC Capital Markets acted as book-running managers.

TC PipeLines, LP is a Delaware master limited partnership with interests in 5,560 miles of federally regulated U.S. interstate natural gas pipelines which serve markets across the United States and Eastern Canada. This includes significant interests in Great Lakes Gas Transmission Limited Partnership and Northern Border Pipeline Company as well as 25 percent ownership interest in each of Gas Transmission Northwest LLC, and Bison Pipeline LLC. The Partnership also wholly owns North Baja Pipeline, LLC and Tuscarora Gas Transmission Company. The Partnership is managed by its general partner, TC PipeLines GP, Inc., an indirect wholly-owned subsidiary of TransCanada Corporation (NYSE:TRP). TC PipeLines GP, Inc. and another TransCanada subsidiary also hold common units of TC PipeLines, LP.

Forward-Looking Statements

This release contains "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Forward-looking statements can be identified by words such as "expects," "intends," "anticipates," "plans," "seeks," "believes," "estimates" and other words or expressions of similar reference to future periods. Forward-looking statements are based on our current expectations and assumptions regarding our business, the economy and other future conditions. As such, they are subject to inherent uncertainties, risks and changes in circumstances that are difficult to predict. Our actual results may differ materially from those contemplated by the forward-looking statements. We caution you against relying on any of these forward-looking statements. They are neither statements of historical fact nor guarantees or assurances of future performance. Important factors that could cause actual results to differ materially from those in the forward looking statements include but are not limited to: our ability to identify and complete expansion projects and other accretive growth opportunities; failure to receive the necessary regulatory approval; failure of the acquisition to be immediately accretive to cash per common unit generated from operations; timing of the completion of the acquisition; changes to management's plans and objectives; demand for natural gas; availability and location of natural gas supplies in the United States and Canada; natural gas prices and regional differences; increases in operational or compliance costs resulting from changes in environmental and other regulations affecting our pipeline systems; weather conditions; the outcome of rate proceedings; and changes in taxation of master limited partnerships. Any forward-looking statement made in this release speaks only as of the date on which it is made. Factors or events that could cause our actual results to differ may occur from time-to-time and it is not possible to predict all of them. We undertake no obligation to publicly update any forward-looking statement, whether as a result of new information, future developments or otherwise, except as required by law.