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Production capacity at Troll, the country's biggest, will be cut by 53.6 million cubic metres (mcm) per day on Thursday, less than the previously expected 65.6 mcm/day.
Gassco also said the outage at the field, which has a full capacity of about 120 million mcm/day, was expected to end on Thursday rather than Friday.
Output from the Kvitebjoern field will be down by 10 mcm/day on Thursday following an outage, less than the previously expected cut of 14 mcm/day.