By Martin M. Sobczyk

WARSAW--Poland's gas firm PGNIG SA (PGN.WA) said Wednesday it sued Russia's OAO Gazprom (GAZP.RS) before an arbitration court in Stockholm demanding lower prices for natural gas.

State-controlled PGNIG said it had failed to reach a satisfactory outcome during negotiations with Gazprom, its main supplier.

The Polish company imports gas from Russia via pipelines crossing Belarus and Ukraine. The company in 2012 won a retroactive discount from Gazprom that added nearly $1 billion to its earnings that year.

A former Soviet satellite state, Poland has complained that it is paying more than some of its western neighbors for Russian gas, in a communist-era legacy that includes little infrastructure to import the resource from other directions.

In recent years, it has developed pipelines to Germany and the Czech Republic, and built a liquefied natural gas port to free itself from dependance on deliveries from Russia.

Write to Martin M. Sobczyk at Martin.Sobczyk@wsj.com

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