GDF Suez said first gas production was achieved from the Juliet field, located about 25 miles off the British coast. At its peak, Juliet should give up around 80 million cubic feet of natural gas per day.
Jean-Marie Dauger, a vice president in charge of global gas development for GDF Suez, said the start of production from Juliet represents a regional milestone for his company.
"Juliet demonstrates our commitment to continuously developing the potential of the United Kingdom Continental Shelf and the value that can be derived in a mature region through the efficient use of existing infrastructure," he said in a statement.
Gas from Juliet will be transported through a subsea pipeline to an onshore processing terminal.
The French energy company discovered the North Sea natural gas field in 2008. GDF Suez says Juliet is a part of a core growth strategy for the British continental shelf.
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