The Storage System Operator (SSO), Operator Systemu Magazynowania Sp. z o.o. (OSM) provides storage capacity in underground gas storage facilities (UGS), which total working capacity is over 2.5 billion cubic meters. The UGS play a crucial role in ensuring the energy security of Poland. OSM was created by PGNiG S.A. as a special purpose vehicle company in order to meet legal requirements concerning the obligation to assign a storage system operator. Our core field of activity is performing tasks of the storage system operator. We provide volumes and capacities of storage facilities that meet needs of the gas storage market participants, at the same enabling the optimal use of these facilities. Storage services are offered in the following UGS located in Poland: UGS Husów, UGS Wierzchowice, UGS Strachocina, UGS Swarzów, UGS Brzeźnica, CUGS Mogilno and CUGS Kosakowo (CUGS – Cavern Underground Gas Storage). Since July 2013, when OSM merged with Investgas S.A., we offer a wide range of services related to the gas and oil industry, including preparation, implementation and operation of underground storage reservoirs of natural gas and fuel in salt caverns and borehole salt mines.