TransCanada to Purchase Duke Energy Interest in Foothills Pipe Lines Ltd.

CALGARY, Alberta - May 13, 2003 - (TSX: TRP) (NYSE: TRP) - TransCanada PipeLines Limited signed an agreement today to purchase the remaining 50 per cent of Foothills Pipe Lines Ltd. (Foothills) from Duke Energy Gas Transmission for $257 million, including $152 million of Duke's proportionate share of Foothill's debt. TransCanada will directly or indirectly own 100 per cent of Foothills and its subsidiaries, subject to regulatory approvals required prior to the final closing of this transaction. Foothills Pipe Lines Ltd. will continue as a standalone entity.

"Our full ownership of Foothills will allow us to continue to grow and optimize our extensive network of natural gas pipelines," said Hal Kvisle, chief executive officer. "The Foothills assets fit well with our Western Canada facilities and are integral to moving future northern gas to North American markets. "

Foothills and its subsidiaries hold the certificates to build the Canadian portion of the Alaska Highway Project. Subsidiaries of Foothills and TransCanada hold certificates to build the Alaskan part of this project. The Alaska Highway project would bring Prudhoe Bay natural gas from Alaska to markets in Canada and the United States. TransCanada continues to strongly support the advancement of this project.

Foothills' current pipeline system extends more than 1,000 kilometres across Alberta, British Columbia and Saskatchewan. This system carries approximately 30 per cent of all Canadian natural gas exports to the United States. It moves Western Canada gas to the U.S. border to serve markets in the U.S. Midwest, Pacific Northwest and California. In operation since the early 1980s, Foothills currently has the capacity to transport 3.3 billion cubic feet of gas per day. A map of the Foothills system is available in the "What's New" section of TransCanada's Web site (www.transcanada.com).

TransCanada is a leading North American energy company. We are focused on natural gas transmission and power services with employees who are expert in these businesses. Our network of approximately 38,000 kilometres of pipeline transports the majority of Western Canada's natural gas production to the fastest growing markets in Canada and the United States. TransCanada has interests in more than 4,000 megawatts of power - an equal amount of power can meet the needs of about four million average households. Our common shares trade under the symbol TRP on the Toronto and New York stock exchanges.

Note: All financial figures are in Canadian dollars unless expressed otherwise.

Forward Looking Information

Certain information in this news release is forward-looking and is subject to important risks and uncertainties. The results or events predicted in this information may differ from actual results or events. Factors which could cause actual results or events to differ materially from current expectations include, among other things, the ability of TransCanada to successfully implement its strategic initiatives and whether such strategic initiatives will yield the expected benefits, the availability and price of energy commodities, regulatory decisions, competitive factors in the pipeline and power industry sectors, and the current economic conditions in North America. For additional information on these and other factors, see the reports filed by TransCanada with Canadian securities regulators and with the United States Securities and Exchange Commission. TransCanada disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

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