Production has begun at a major new offshore gas plant in the west of Shetland region.
French company Total's £3.5 billion development in the Laggan-Tormore fields is expected to add the equivalent of 90,000 barrels of oil per day in gas to the UK's energy supply.
It is reported to be the largest construction project in the UK since the London Olympics.
Total said: "It's a uniquely challenging environment in which to operate, but also one with great potential."