Expansion of the Horizon oil sands project has been divided into three broad phases which are phase 1, phase 2 including phase 2A and Phase 2B, and phase 3. Phase 1 has been subdivided into Tranche 1, Reliability (Tranche 2) and Directive 74. Phases 1 and 2A are complete, Phase 2B was completed in 2016 and Phase 3 will be completed in Q4 2017.

Cost breakdown by year for phase 2A, 2B & 3 are: $2.026B in 2014, $2.186B in 2015, $1.918B in 2016, and $1.055B in 2017 for a total cost of $7.185B