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In page Keystone Pipeline:

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Additional phases (III, completed in 2014, and IV, rejected in 2015) have been in construction or discussion since 2011. If completed, the Keystone XL would have added 510,000 barrels (81,000 m3) per day increasing the total capacity up to 1.1 million barrels (170,000 m3) per day.[9] The original Keystone Pipeline cost US$5.2 billion.[citation needed] From January 2018 through December 31, 2019, Keystone XL development costs were $1.5 billion.[10]: 147