- Oil has been produced in Croatia since the 1850s
- The main focus of exploration and production is in the Adriatic sea
- 1960 - First discovery offshore Ravenna Mare-Punta Marina
- 1973 - The Ivana gas field was discovered
- 1992 - Largest oil discovery offshore – Elsa 1
- 2002 - ENI signed contract to develop offshore gas fields
- 2014 - The Croatian Hydrocarbon Agency was launched
- The Croatian Hydrocarbon Agency has formally commenced with work on February 2014.
- The Agency acts as operational support to competent bodies in domain of exploration and production of hydrocarbons in Croatia.
- Namely, the Agency is responsible for geological data management and presentation, preparation of license rounds, investors monitoring and support once they get the license and sign Production Sharing Agreement, implementation of environmental standards such as safety offshore and reporting towards European Commission.
- The oil reserves in Croatia are located southeast of Zagreb, along the Hungarian border, and along the Adriatic Sea.
- The reserves of gas in Croatia, like those for crude oil, are located mainly in three parts of the country: southeast of Zagreb, along the Hungarian border, and along the Adriatic Sea.
- ENI & INA have a 50/50 joint-venture for the fields, Annamaria, Ivana, Ika & Ida, Ana, Vesna, Irina, Marica and Katarina
- The national oil company is INA
- Natural Gas Infrastructure in the northern Croatian Adriatic includes pipeline connections to both Croatia’s and Italy’s natural gas transmission systems from 18 production platforms and 1 processing platform
- There are plans to build an import terminal for LNG
- Adria LNG Terminal and Hrvatska Lng Terminal are competing projects
- There are two refineries in Croatia, both belonging to INA, the Rijeka Refinery and the Sisak Refinery