The UK’s main natural gas storage facility on the Rough Field in the North Sea. It is an offshore storage that originally belonged to BG which set it up as a storage facility about 20 years ago as a strategic storage to support the grid if it failed or if one of their major gas fields fell over. It can supply about 1.5 bcf of gas per day for approximately 100 days. The gas is received from the national transmission system and it is mainly used today as a trading pool, namely to buy gas and store it when it is cheaper and sell it off on days when the gas is more expensive.