Sept 26 (Reuters) - TransCanada Corp TRP.TO :
* Unit Columbia Pipeline Group offered to buy 53.8 million units of Columbia Pipeline Partners, LP at a price of US$15.75 per common unit
* TransCanada announces offer to purchase all common units of Columbia Pipeline Partners, LP
* Committee composed of independent directors of CPPL board will be formed to consider offer Source text for Eikon: ID:nMKWp96x7a Further company coverage: TRP.TO