Managing natural gas exploitation which is subject to seasonal changes necessitates gas storage in the periods of lower demand to maintain the stability of gas production. Bearing in mind the natural seasonal character of gas consumption in Poland, it is necessary to use definite working gas volume of underground gas storage facilities (UGS) to maintain a suitable level of gas production from domestic sources in the periods of low gas consumption The main aim of the paper is to investigate the impact of gas storage on gas production strategy from domestic fields based on the example of Poland, and to calculate the amount of gas which should be stored to optimize gas production. The method of calculation, presented in this paper, has been applied to the historical data of methane-rich and nitrogen-rich gas supply and demand in Poland. The storage capacity needed for providing stable production, calculated according to formulas presented in this article was about 1.42 billion m3 of methane-rich natural gas in the last year, which means that 47.7% of yearly domestic production was stored. Apart from the methane-rich system, two nitrogen-rich gas subsystems are operating in Poland. Those gas systems are regional closed systems, i.e. without the possibility of arbitrarily supplementing with gas deliveries from other transmission systems. The UGS were not used for storing nitrogen-rich gas in the past, therefore production from nitrogen-rich gas fields was increased in the winter and lowered during summer months. At present PGNiG S.A. has at its disposal two nitrogen-rich gas storages: UGS Daszewo and UGS Bonikowo. Working capacity needed for regulating the production of nitrogen-rich gas and calculated according to presented formulas is about 200 million m3. The use of UGS enables stable exploitation of methane-rich gas fields and steady production levels in gas processing plants. In addition no major fluctuations were observed in the aspect of high seasonality of natural gas consumption (related to climate and the structure of the gas consumers in Poland). In the summer season methane-rich gas imports exceed demand and its flexibility is strongly limited, which results from the realization of contracts, especially the obligation of receive minimum annual and summer amounts of gas, and technical parameters of the transmission network. By using methane-rich UGS in the analyzed period there was neither correlation between the monthly amount of production and consumption of high-methane gas, nor between the size of production and temperature. In the case of the closed nitrogen-rich gas system there have recently been large fluctuations caused by not using UGS. Since then a new UGS Bonikowo has come into use, thanks to which production could be, to a considerable degree, stabilized.