Winnipeg Free Press By: The Canadian Press CALGARY - TC Energy Corp. says it has no intention of again sweetening its bid to buy out the other unitholders of TC PipeLines LP, a U.S. master limited partnership it operates, despite the vow of its largest non-affiliated investor to vote against the transaction. Pipes intended for construction of the Keystone XL pipeline are shown in Gascoyne, N.D. on Wednesday April 22, 2015. THE CANADIAN PRESS/Alex Panetta CALGARY - TC Energy Corp. says it has no intention of again sweetening its bid to buy out the other unitholders of TC PipeLines LP, a U.S. master limited partnership it operates, despite the vow of its largest non-affiliated investor to vote against the transaction.