THE first gas from APLNG has left Gladstone marking four years of planning and construction.
The LNG ship, the Methane Spirit, left the port on Saturday as planned.
APLNG was the last of the of three Curtis Island gas plants to produce gas after Train 1 was brought online late last year.
It is also the largest producer of LNG in Eastern Australia, projected to produce 9 million tonnes of LNG each year when the plant is at full capacity running two trains - which is expected before the end of this year.
Four out of the planned six trains for the three plants are now producing gas.
IF YOU'VE been watching the activity over on Curtis Island closely you'll have seen a third gas giant counting down to its first shipment.
On Saturday APLNG will send its first ship, tanker Methane Spirit, overseas. It's currently docked at the company's Curtis Island jetty.
The ship has the capacity to hold more 100,000 tonnes and will carry the LNG to APLNG's major customers in China and Japan.
The shipment is marginally behind schedule given the company expected its first load to leave Gladstone before the end of 2015.
When the project began, APLNG was also hoping to have Train 1 online by mid-2015, but it wasn't until February that the first gas from the Surat Basin was brought into the plant, fed by more than 970 gas wells.
The departure of the first shipment is a significant milestone for APLNG which only started producing LNG from its $24.7 billion plant on December 11 after ten days of commissioning the plant.
APLNG has been tight lipped on the first export, saying only that "Australia Pacific LNG's plant on Curtis Island continues to ramp up production, and first export is expected to occur shortly".
They haven't specified how many shipments are expected each week, but when the plant peaks, with two trains online, 9 million tonnes of LNG are expected to be exported each year.
QGC --- owned by BG-Group --- says they will peak at 8 million tonnes and 120 ship movements each year --- or one ship loading every three days.
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