Feb 22 (Reuters) - TransCanada Corp TRP.TO
* TransCanada launches open season on revised mainline tolling option
* TransCanada Corp - continues to offer a 10-year term and a targeted total subscription of 1.5 pj / day at a simplified single rate toll of $0.77/gj
* TransCanada - launch of open season follows ongoing discussions with western Canadian sedimentary basin producers; expected to close on March 9, 2017
* TransCanada Corp - proposal with WCSB does not impact current contracts that are already in place on Canadian mainline system Source text for Eikon: ID:nCCN3m87sc Further company coverage: TRP.TO