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Both outages are now seen lasting for one to three days compared to an earlier estimate of one to two days, but the duration was uncertain, Gassco added on its website.
Statoil shut Troll late on Tuesday after smoke was detected in an electrical switchboard, but quickly determined that there was no fire.
Statoil said earlier on Wednesday it is preparing to start up gas production at Troll but has no estimate yet on when exports will start to flow.