Gaz-System head Andrzej Osiadacz told AFP: "We have registered a fall in deliveries in Russian gas coming via Ukraine of about 10 percent."

He was speaking after the state-controlled Russian energy giant Gazprom, which supplies about 25 percent of the European Union's gas needs, cut exports to Europe amid Arctic weather conditions in Russia.

"We are managing to compensate easily for this by reaching into our reserves," Osiadacz said.

"If the level of the reduction stays at the same level, we have nothing to fear."

Imports of Russian gas into Poland fell by up to 50 percent in early January after Moscow cut supplies to Ukraine, as part of a row over gas prices between the two countries, Polish officials said.

Poland used 13.6 billion cubic meters of natural gas in 2004, around one-third of which was drawn from domestic sources, 42 percent was imported from Russia, 20 percent from central Asia, and lesser quantities from Norway and Germany.