The Canadian Energy Pipeline Association and others blamed TransCanada's decision on Ottawa's "unclear decision-making process".
TransCanada says it will inform the National Energy Board that it will no longer be proceeding with its applications for both pipelines.
The vast majority of Canadian crude exports go to the United States, and Energy East would have shipped 1.1 million barrels a day to east coast ports for loading onto tankers destined for higher-priced markets in Europe and Asia.
The Liberals are defending jobs while protecting the environment, Trudeau insisted during question period, but "the market conditions have changed fundamentally" since the pipeline was proposed, including a steep drop in oil prices, he said.
Notley says the decision puts new emphasis on the Trans Mountain pipeline project to British Columbia and called on the NEB to "send a clear message" on regulation for future energy infrastructure projects.
October 5, 2017 amidst an unprecedented announcement from the National Energy Board that it would include upstream and downstream greenhouse gas emissions in its review of the pipeline.
TransCanada Corp. has cancelled its $15.7-billion proposed Energy East pipeline, with CEO Russ Girling citing non-specific "changed circumstances" Thursday morning.
The pipeline operator had envisioned the Energy East and Eastern Mainline projects to help increase western Canadian oil producers' access to east-coast and offshore refineries and increase natural-gas supplies to Southern Ontario.
New polling released by Abacus Data in September indicates a majority of Canadians (59 per cent) are growing "more anxious about climate change and it is changing my view of how long we should use oil".
"But there is no doubt that with the Energy East pipeline project we would have been able to do even more to grow the economy, strengthen education and improve health care in our province". "Energy East is just the latest in a growing list of projects that will never see the light of day", he continued. Several global companies have sold off oilsands projects in the past year.
"Again it shows how local governments can make a difference", Coderre explained.
TransCanada said it needed time to review recent changes announced by the NEB on environmental assessment factors and other issues related to the projects.
That's because the business case to build the pipeline has always been looking less than clear, he noted.
Carr shrugged off Raitt's criticism, saying there are signs of growth in the energy sector despite "market challenges" posed by sagging oil prices.
Concern about limited market access is one of the reasons foreign oil companies have sold off $23 billion in Canadian assets this year, along with high production costs that have made the country's oil sands unattractive.