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Gassco data showed on Tuesday that the planned yearly maintenance turnaround had started.
The gas treatment plant unavailability is expected to last until July 10, the data shows.
Equinor decided to stop Hammerfest LNG production on January 2 due to an issue on a compressor which reinjects CO2 to the field.
The firm extended the shutdown on January 9 for ten more days due to additional repair work.
Equinor’s LNG plant mainly supplies European countries with LNG.
According to Equinor, its production capacity of around 6.5 bcm of gas per year is enough to supply 6.5 million households with light and heat.
The LNG terminal liquefies natural gas coming from the Snohvit field in the Barents Sea.
Gas reaches Hammerfest LNG via a 160-kilometer gas pipeline which became operational in the autumn of 2007.
Equinor is the operator of both the Snohvit field and Hammerfest LNG with a 36.8 percent stake.
Other license owners of Snohvit are Petoro (30 percent), TotalEnergies EP Norge (18.4 percent), Neptune Energy Norge (12 percent), and Wintershall Dea Norge (2.81 percent).
In addition, the partners are currently working on upgrading the facility.
The Snohvit Future project will extend the productive life of Hammerfest LNG past 2030, and includes onshore compression and electrification of Hammerfest LNG.
Equinor and its partners said in December 2022 that they would invest 13.2 billion Norwegian krone ($1.27 billion) to upgrade the facility.
In October 2024, Equinor reported an increase in costs for the Snohvit Future project.