ExxonMobil has announced its final investment decision to expand the Fawley refinery in the UK, increasing production of ultra-low sulfur diesel by 45% or 38,000 barrels per day. The investment will also include a hydrogen plant to improve the refinery's energy efficiency. The project aims to reduce the need for diesel imports into the UK, which imported half of its supply in 2017. Construction is set to begin in late 2019, subject to regulatory approval, with completion expected in 2021. The investment is part of ExxonMobil's plans to increase the earnings potential of its downstream business by 2025.