STSI Ltd. is a member of INA Group that performs the activities of maintenance and construction of plants. The company was established in 2001 by demerging from INA, therefore it is primarily focused on the activities of maintenance and construction of oil and gas production and processing plants – from well to refinery, as well as other plants and facilities used in the petrochemical industry and other facilities. STSI Ltd. is the largest company in the Republic of Croatia for maintenance activities, which provides a full maintenance service involving all professions (mechanical engineering, electrical engineering and instrumentation and control engineering, civil engineering).

STSI Ltd. is a company appointed by INA as a “Single Service Company” for the maintenance of all plants owned by INA Plc.

STSI Ltd. performs plant construction activities in the Republic of Croatia as well as abroad. There is a wide range of facilities that the company has built or participated in their construction – ranging from the main gas pipelines to refineries and petrol stations. STSI Ltd. is committed to operating in accordance with sustainable development, which means that the company strives to integrate economic, environmental and social factors into everyday business. Striving to make energy available, STSI Ltd. wants to be a driver of social and economic development, taking care of people and the environment, supporting responsible business activities and local partnerships.

Company Profile