Here's what wikipedia has as a description of the history.
In 2013, the National Energy Board approved a proposal by Kinder Morgan to expand the pipeline with a second span, built roughly parallel to the existing pipeline. The project would expand its capacity from 300,000 barrels per day (48,000 m3/d) a day to 890,000 barrels per day (141,000 m3/d). The proposal attracted controversy due to its potential environmental impact, having faced legal challenges, as well as protests from environmentalists and First Nations groups. The disputes intensified in early 2018, when Alberta and B.C. engaged in a trade war over the expansion project. In May 2018, the federal government announced its intent to buy the pipeline from Kinder Morgan for $4.5 billion, and seek outside investors to complete the expansion (who would also be indemnified for any delays induced by provincial or municipal governments).
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