The cargo, which arrived on Tuesday, is owned by Japan's Kyushu Electric Power and was shipped from Australia, Wiko Migantoro, Pertagas chief executive said on Friday.
The 142,200 cubic meter cargo of LNG was the first the storage site has ever received, Pertagas said in a statement.
Migantoro said the LNG hub has a three-year storage contract with Kyushu Electric.
The LNG hub in Aceh on Sumatra island has two storage units with a combined capacity of 210,000 cubic meter, it said.
Migantoro said the company is prepared to expand the capacity should there be more demand for storage.
A Kyushu Electric spokeswoman said the storage facility can be used to adjust its LNG supply as demand for the fuel has been fluctuating due to the growth of renewable power generation.
She declined to comment on how the company would deal with the stored LNG due to the confidentiality of the matter.
(Reporting by Wilda Asmarini; Writing by Fransiska Nangoy; Editing by Tom Hogue)