Originally published July 14.

Canada's oil pipelines are already operating to their full potential and the Energy East project is well-positioned to meet the country's projected need in increased capacity by 2020, according to a briefing memo to Natural Resources Minister Jim Carr obtained by CBC News.

"Absent this capacity, more oil will be shipped by rail, and some production will be restricted," reads the document, dated Feb. 15, 2016.

  • Read the full memo: It's embedded at the bottom of this story

The memo was released under an access to information request and largely contradicts an earlier finance department memo, obtained in the same way, which suggested Canada already has sufficient capacity between rail and pipelines "until at least 2025."

Andrew Leach, an energy and environment economist at the University of Alberta's school of business, said he's more inclined to trust the analysis in the memo sent to Carr.

"[Natural Resources] Canada is traditionally the department where you have the most expertise in studying the ins and outs or nuts and bolts of crude oil markets," he said.

"So it wouldn't be surprising for them to have more detail on the specific attributes of the market."

Implications for Energy East

Canada's total oil production is expected to reach 4.9 million barrels per day by 2020, according to the memo, up from 3.9 million in 2014.

The document highlights the Energy East pipeline as being well-suited to meet those future capacity needs, given its projected capacity of 1.1 million barrels per day and potential in-service date of 2020 to 2021.

The $15.7-billion pipeline would carry western crude as far east as Saint John to serve domestic refineries and international customers, using existing TransCanada pipeline as far east as Montreal and requiring the construction of 1,600 kilometres of new pipeline through Quebec to the south coast of New Brunswick.

TransCanada Energy East pipeline

TransCanada's proposed Energy East pipeline would ship crude from Alberta to New Brunswick. (Canadian Press)

"TransCanada's proposed Energy East project would provide access to new markets in Europe and India, but would also strengthen Canada's long-term energy security by providing eastern Canadian refiners with reliable access to domestic crude supplies," the memo reads.

No other single pipeline project currently undergoing a regulatory review could meet the 2020 need, the memo notes, although some combination of projects could.

Infrastructure gap costs $7.3B a year

The memo also says Canada's lack of existing infrastructure to get oil to global markets is estimated to have cost domestic producers an average of $7.3 billion annually from 2011 to 2013.

"This represented a cumulative loss of $21.9 billion, or one per cent of nominal GDP," the document reads.

It goes on to say that new pipeline capacity will still be important to the industry in the wake of the oil price crash.

"In the current low oil price environment, the difference between sending oil by rail or by pipeline significantly impacts netbacks for producers (e.g., it costs $5 per barrel more for rail than pipe when shipping from Alberta to the Canadian West Coast, $6 per barrel more to Canada's East Coast, and up to $10 per barrel more to the U.S. Gulf Coast)," the memo states.

"Building new pipeline capacity would reduce transportation costs and assist companies in advancing production projects under development."

Andrew Leach

Andrew Leach is an energy and environment economist at the University of Alberta's school of business. (CBC )

Leach agreed with that assessment.

"The pipeline system, as a whole, is at a fairly high rate of utilization. Put forward some of the new projects that are still in construction in the oilsands, you're going to meet or exceed that total system capacity within the next year or so," he said.

"That future growth would be of higher value if it were served by pipelines than if it were served by rail."

Energy East is currently the subject of what the National Energy Board has deemed "innovative" regulatory hearings that will include an unprecedented level of public input from communities along the proposed route.

The regulatory body has been given 21 months to carry out its review, with its final report due no later than March 16, 2018.

Carr announced changes to the regulatory review process last January, but has also noted that the ultimate decision on pipeline approvals rests with the federal cabinet.

Memo to Finance Minister Jim Carr

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