Back during the Industrial Revolution in the 19th Century, the British city of Newcastle was the coal supply and exporting hub of the country! Thousands were employed loading coal bound for the hundreds of new factories around the country. If you needed coal, go to Newcastle! Thus any foolish idea which came up was compared to "sending coals to Newcastle."
Yet the same foolish idea occurs here in Canada!
Eastern Canadians vehemently oppose the import of Alberta oil into their provinces yet they happily buy oil from overseas markets! To me that doesn't make a whole lot of sense. I don't think that it is environmentally safer to bring oil into the Maritimes with these huge oil tankers. A pipeline from Alberta could do the job more safely and more efficiently. Maybe Arab oil is easier to refine or maybe it's cheaper right now.
To me sending oil to a oil rich country like Canada is akin to "sending coal to Newcastle"!