At peak output, the Eirin field is expected to deliver about 270 million cubic metres of gas annually, Orlen said in a statement.
The company added that production was being carried out using installations powered by electricity from renewable sources.
"Gas production from the Norwegian Continental Shelf plays a vital role in enhancing the energy security of both Europe and Poland, which makes Orlen's long-term presence in Norway strategically important," said Orlen CEO Ireneusz Fąfara.
"Bringing the Eirin field onstream strengthens our position in the region and demonstrates our commitment and capability in executing investments that expand the hydrocarbon potential of the shelf," he added.
Fąfara said gas from the field is already being delivered to Poland, helping ensure stable supplies "despite the challenging international environment."
The Eirin field is located about 250 kilometres west of Stavanger, Norway. Its recoverable resources are estimated at 27.6 million barrels of oil equivalent, including about 3 billion cubic metres of natural gas, according to Orlen.
Its subsidiary Orlen Upstream Norway holds a 41.3-percent stake in the project, corresponding to 11.4 million barrels of oil equivalent, including around 1.2 billion cubic metres of gas. The remaining stake is held by Equinor, a Norway-based international energy company.
Source: IAR, PAP, orlen.pl