OSLO, May 20 (Reuters) - Norwegian gas system operatorGassco increased its forecast for a gas outage this week as somefields shut for maintenance work, it said in a market message onTuesday.
Output will be down by 25 million cubic metres (mcm) onWednesday, on top of a series of maintenance work alreadyscheduled from Thursday.
For a list of outages, please click (Reporting by Balazs Koranyi)