Alberta Premier Rachel Notley says the federal government is being unfair in the way it assesses pipeline projects, but her government will not go to court for now to try to make it right.

Notley, speaking after last week's cancellation of the Energy East pipeline, says she will focus on working with Prime Minister Justin Trudeau's government to advance two other projects that already have the green light.

"We're going to look at what the impact of the NEB (National Energy Board) has on (pipeline) projects going forward," Notley said in Calgary on Friday when asked if she was considering a legal challenge on whether the regulator is acting outside its mandate.

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"Right now we are working effectively with the federal government on moving forward on the Kinder Morgan approval (and) moving things forward with respect to the Line 3 approval."

Notley's conservative opponents in Alberta have demanded she take a harder line with Ottawa and with pipeline critics. They also want Alberta to challenge in court the regulator's recently expanded mandate — at the behest of the federal government — to examine not only the specific environmental impacts of a pipeline project, but also the downstream effects when that oil is transported and burned for fuel.

Notley suggested that a confrontational approach is childish and ultimately self-defeating.

"Having little temper tantrums where you close your eyes and you clench your fists and you get really red in the face and you yell at (opponents) gets you nowhere," she said.

"What you need to do is address the issues that people are concerned about."

The premier said her approach, which includes a carbon tax and capping oilsands production, led to the approval by Trudeau's government last year of Kinder Morgan's expansion of the Trans Mountain line to the West Coast and Enbridge's Line 3 upgrade to take oil through to the U.S. Midwest.

Alberta has been pushing for years for new and expanded pipelines to get its oil to deep-water ports so it can be shipped overseas and fetch a better price.

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The Energy East line, proposed by Calgary-based TransCanada Corp., would have taken oil from Alberta and Saskatchewan to refineries in Montreal and New Brunswick.

It was opposed by Indigenous and environmental groups and by critics in Quebec, including Montreal Mayor Denis Coderre.

Notley said she has no problem with upstream effects, but suggested it's unfair to tack on downstream ones.

"The inclusion of downstream emissions into the consideration is somewhat discriminatory to the energy industry," she said.

"We certainly don't see people including the downstream emission consequences of car parts going onto rail. It doesn't seem to make a lot of sense."

TransCanada has cited the regulatory changes and "changed circumstances" as the reason for its pullout.

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The move has become starkly politicized. Critics of Notley and Trudeau say the two suffocated a nation-building project with red tape. Notley and Trudeau have said market forces and a supply glut were the deciding factors.

The issue is front and centre in the leadership race for Alberta's new United Conservative Party. Contenders are accusing Notley of kowtowing to Ottawa and others seeking to scuttle energy projects.

"The premier should be using every single legal tool available to the province to challenge the federal government and every other jurisdiction on this," Brian Jean, a candidate and former leader of the Wildrose party, said in an interview.

Kenney has demanded Ottawa roll back the energy board's expanded mandate. He calls it a "violation of Alberta's constitutional jurisdiction to regulate its own production."

The third candidate, Doug Schweitzer, wrote on Twitter that Albertans "want us to stand up and fight.

"Hugs don't work," he added.