The West of Shetland area is a region in the northern Atlantic Ocean, where there are currently three developed offshore fields; Schiehallion, Foinaven and Clair.
A number of further hydrocarbon discoveries have been made in the area, but these are not currently considered to be economic due to the high costs of development.
The Laggan-Tormore and Rosebank-Lochnagar discoveries are in the process of being further appraised for development, but the WOSP is considered to be unable to carry the additional gas production from these fields.
[1] WOSP is owned collectively by the owners of the Schiehallion, Loyal, Foinaven and East Foinaven fields; each owner company holds divided capacity rights in accordance with its ownership interest.
The system consists of a 20-inch (510 mm) trunkline which begins near Schiehallion and has length of 188 kilometres (117 mi).