"A company that made 700 changes to its plans as part of that response", Wall said in a statement Thursday.
The Canadian Energy Pipeline Association and others blamed TransCanada's decision on Ottawa's "unclear decision-making process".
Alberta Premier Rachel Notley said Thursday that now Energy East is dead, there is an even greater urgency in completing the Trans Mountain project to B.C.to diversify the industry's export markets beyond the United States.
"TransCanada was forced to make the difficult decision to abandon its project, following years of hard work and millions of dollars in investment".
Canada's Natural Resources Minister Jim Carr said the cancellation was a business decision and oil markets had changed since the pipeline was first proposed. It was supported by the governments of New Brunswick, Saskatchewan and Alberta, but opposed by Quebec.
The review process is over, but several legal challenges to the pipeline - including over whether the environmental review adequately considered climate impacts - have tied the project up in the courts.
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Canada's National Energy Board (NEB) granted TransCanada a 30-day suspension on Sept 8, after the company said it needed to review the impact of new assessment criteria that would consider the C$15.7 billion (US$12.58 billion) project's indirect greenhouse gas contributions.
The company has said repeatedly that eastern Canadian refiners rely on imports for 86 per cent of their daily needs.
"In light of the project's inability to reach a regulatory decision, no recoveries of costs from third parties are expected". "Our government understands that deliberation on upstream emissions and land-use integrity is important and must continue". That pipeline, however, is now locked up in lawsuits, and the B.C. government is intervening in challenges to its approval.
TransCanada's decision is also a blow to the ailing economy of New Brunswick province, where the pipeline would have terminated. In a statement, he sought to console job-seeking constituents who were counting on the pipeline's approval.
Saskatchewan Premier Brad Wall says the reasons for the decision fall at the feet of Prime Minister Justin Trudeau and the federal government. "There will be a new deal for Saint John".
Energy East was up for its second NEB review, after the first stalled previous year amid protests by environmentalists and after revelations that regulatory panel members met privately with a TransCanada consultant. As the proposal was cancelled on Thurs. In the summer of 2016, the National Energy Board's review of Energy East was compromised after it was revealed by the National Observer that former Quebec Premier Jean Charest met the chairman and two commissioners on the National Energy Board while working for TransCanada.