Polish gas firm PGNiG SA (PGN.WA) has asked the Polish energy regulator to approve a cut in the regulated prices of natural gas after Russia 's OAO Gazprom (GAZP.RS), its main supplier, agreed to lower its prices, the company said Tuesday.

The company requested a cut of 3.3% in the prices it charges its highest-margin customers, mainly fertilizer producers who use gas in their production process. It requested a cut of about 10% for individual customers, it said.

PGNiG buys most of its gas from Gazprom and sells it to domestic customers at regulated prices. PGNiG has said it often posts losses on gas trading because of the regulator's reluctance to approve higher tariffs and Gazprom's previous reluctance to lower its prices.

PGNiG and Gazprom said Nov. 6 that the Russian gas giant had agreed on a price cut of more than 10% for the Polish company, paving the way for PGNiG to file a petition for lower regulated gas prices, with the new price levels slated to take effect
Jan. 1, 2013 .