Norwegian oil workers are continuing to expand their strike up until this date, which could lead to the shutting of oil and gas production at six offshore fields, according to Reuters.

This escalation could reduce Norway’s petroleum production capacity by as much as 330,000 barrels of oil equivalent per day (boe/d) or 8% of the country’s total output, the Norwegian Oil and Gas Association (NOG) announced.

The conflict began on September 30 when 43 workers went on strike but did not initially impact oil and gas output. However, tensions have escalated and the Lederne trade union chief, Audun Ingvartsen, said in a statement: “Employers are still showing no willingness to meet our demands, thus triggering the escalation,”

Oil output from six fields could immediately shut, including Equinor’s Gudrun, Gina Krog and Kvitebjoern fields, as well as Kvitebjoern’s satellite Valemon field.

On top of this, the Neptune Energy-operated Gjoea field and its satellite Vega field, operated by Wintershall Dea, will also likely shut, according to NOG.

Equinor, Neptune, and Wintershall Dea did not immediately respond to requests for comment when contacted by Reuters.