March 17 (Reuters) - TransCanada Corp TRP.TO , the company
behind the controversial Keystone XL oil pipeline project, said
it had agreed to buy U.S. natural gas pipeline operator Columbia
Pipeline Group Inc CPGX.N in a deal valued at $13 billion.
TransCanada will offer $25.50 per share in cash for each
Columbia Pipeline share, a 8.5 percent premium to the stock's
Thursday close.