The 50:50 joint venture plans to invest around US$1 billion over the next six years in the Saudi fuel retail market.
The signing took place on the sideline of the inauguration ceremony of the National Industrial Development & Logistics Program (NIDLP).
Following a highly-competitive selection process, Eni was awarded a 20% share in ADNOC Refining, with OMV awarded a 15% share.
Saudi Aramco and Air Products will establish a pilot fleet of fuel cell vehicles for which high-purity compressed hydrogen will be dispensed at the new fuelling station.
The FSRU, owned by Excelerate Energy, will undergo drydocking, maintenance and upgrades at the facility.
The fixed lump sum contract encompasses the engineering, procurement and fabrication of four Ammonia Tanks and nine CB&I storage tanks.