Do not mistake the Tar Sands partners for political neophytes, they are politically savvy and from all appearances are planning for all contingencies. The Keystone pipeline is one proposal to get tar sands oil to market, the US market. Loading a supertanker @ Houston and heading to Asia is not competitive because of the long distance traveled. Loading Supertankers on the west coast of Canada makes far more sense, in fact the distance is sightly less than the distance from the Persian Gulf to Asia.
There are 2 more pipeline proposals, both from the tar sands to the west coast, but via 2 different routes. The Enbridge proposal runs just about due west from the tar sands, thru First Nation lands to Kitimat on the coast where a supertanker loading facility is proposed. Supertankers are the first choice to ship oil long distances, carrying up to 4 million barrels of crude, in this case analysts say Asia.
There exists another west bound pipeline the Morgan Kinder line. It runs to port at Burnaby, British Columbia. The Burnaby terminal handle tankers up to 650,000 barrels, and Morgan Kinder is looking to add another facility to handle tankers capable of carrying up to 1 million barrels. These smaller tankers head south to California with the tar sands crude.
Integrated plan to deliver tar sands crude oil to market.
Distilled down, there 3 pipelines with 3 distinct goals. The Enbridge proposal would deliver 550,000 barrels a day to Kitimat, where supertankers would take the oil to Market in Asia. Keystone goes to the heart of US oil country, Texas, slated to deliver 900,000 barrels a day. The Morgan Kinder Trans Mountain pipeline in operation since 1953, delivers 300,000 barrels a day to Burnaby B.C., where smaller coastal tankers head south to deliver oil to the West Coast if the US.

The Keystone proposal.

The Enbridge proposal in relation to the Alberta Tar Sands.

Image from Carol Linnitt showing the Enbridge proposal in relation to First Nation lands.
The Yinka Dene Alliance expressed in May that, under no circumstance, were they interested in negotiating with Enbridge.
http://www.desmogblog.com/...

The larger picture.
The Kinder Morgan presentation says the Transmountain pipeline branch to Kitimat would cost $4 billion, compared to the $5,5 billion that Enbridge has budgeted for the Northern Gateway project. The Transmountain pipeline would have a capacity of 450 million barrels a day compared to the Northern Gateway capacity of 550 million barrels a day.
http://nwcoastenergynews.com/...
t
he Vancouver end of the project would require the dredging of Second Narrows to allow large supertankers to visit the port. Tanker traffic in Vancouver would increase,
http://nwcoastenergynews.com/...
An expansion of the Trans Mountain system using its existing right of way is likely to face less opposition than the Northern Gateway has received, with First Nations along that line's planned route pledging to block access to their lands.
http://uk.reuters.com/...
Kinder Morgan has long discussed plans to expand the Trans Mountain system, which it ultimately hopes to bring to 700,000 barrels a day. In 2008, it completed a $750-million project that added 40,000 barrels of pipe capacity by twinning the system through Jasper National Park.
http://uk.reuters.com/...
The expansion is underway, the twinning or adding a second parallel pipeline.By adding a northern route that heads to Kitimat, that pipeline avoids the First Nations lands, and a supertanker loading facility at Kitimat means an expansion of the Vancouver facility to handle supertankers isn't as necessary.
So the Alberta Tar Sands partners are reaching out to gain 3 supertanker ports, Burnaby, Houston and Kitimat, fed by a web of pipelines that deliver tar sands crude oil to shipping facilities.
Please visit my other tar sands diaries for lots more information and analysis.
EPA: Tar Sands-82% more GHG than conventional oil.
Tar Sands to consume all natural gas in Canada and Alaska
Alberta Tar Sands: Canada missing its Kyoto targets
Tar Sands alternative, Light crude from Alaska, instead of dirty low quality oil
And a big mother lode of stuff, unparalleled in the blogging world
7 pipelines and 18 nuclear reactors for Alberta

What would the big man Al Gore say?
Over 200,000 people have signed the petition telling President Obama to stop the Keystone pipeline. If you haven't done so yet, please sign the petition to stop the Keystone pipeline.