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The outage, due to a failure in its external power supply, is expected to last 10 to 14 hours and the plant started to ramp up shortly after the outage, Gassco said.
Norway supplies a fifth of the European Union's gas needs.
Kollsnes on the country's west coast has a daily processing capacity of 143 million cubic metres per day, or around 40 percent of Norway's maximum daily production.