BP and its partners have announced first oil production from a redeveloped UK North Sea field.
Schiehallion, located 110 miles west of Shetland, had been shut down for refurbishment since 2013.
BP, Shell and Siccar Point Energy expects the Quad 204 project and neighbouring fields to unlock an estimated 450 million barrels of resources, extending the life of the fields out to 2035 and beyond.
Production from the project is expected to ramp up through the remainder of 2017 to 130,000 barrels of oil per day.
Bob Dudley, BP Group Chief Executive said: “The start of production from Quad 204 – one of the largest recent investments in the UK – is an important milestone for BP, marking a return for growth for our North Sea business.”
BP is planning to double its UK North Sea production to 200,000 barrels of oil equivalent a day by 2020.
It expects to participate in up to five exploration wells in the UK in the next 18 months, in addition to drilling around 50 development wells in the next three to four years.