The project includes a new 91-centimetre pipeline between Edmonton and Hardisty, Alta., as well as additional tankage and terminal facilities.
The new line will initially be able to carry 570,000 barrels per day, but has the potential to be expanded to 800,000 barrels.
"The agreement with shippers on terms for the expansion continues our collaborative relationship, ensuring that we provide the facilities and services they need to maximize the value of their crude oil," said Stephen Wuori, president of liquids pipelines at Enbridge.
Construction could begin as early as the first quarter of 2014, with start-up targeted for mid-2015.
The proposed 179-kilometre pipeline will follow the route of Enbridge's existing line along that corridor, which the company says will minimize the environmental impact.
Enbridge (TSX:ENB) intends to file a regulatory application by the end of the year.
Enbridge is the dominant crude shipper in the oilsands region, although rival TransCanada Corp. (TSX:TRP) has been growing its presence in that market. Many of regional Alberta pipelines end up in Edmonton.
Hardisty, southeast of Edmonton, is where major Enbridge and TransCanada U.S.-bound pipelines start.