Methane Rita Andrea was the first vessel to berth at the LNG facility back in December 2014, before the first shipment of LNG was exported in early January 2015.
All three LNG facilities on Curtis Island are now operational with Australia Pacific LNG exporting its first shipment last week.
The majority of their exports are under long-term contracts to supply to China, Japan, South Korea and Malaysia.
LNG operations are said to add over 25m tonnes of trade through the Port of Gladstone each year.
Source: Green Port