Australian Industrial Energy flagged in August that it would be seeking government approval to increase capacity at the $250 million terminal.

The formal modification request was lodged last month and is now available on the Planning Department's major projects website.

The request includes the admission AIE had assumed demand for liquefied natural gas (LNG) would be the same year-round.

"Further analysis of the market has identified that demand for gas would be seasonally dependent," the modification report states, "with higher demand, particularly from retail customers in winter months."

The original government approval was for 24 LNG tankers throughout the year but the modification wants to increase that to as many as 52 vessels.

Most of the extra tankers would be entering the port during the expected six-month period of peak demand - April through to September.

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"The modification may result in smaller LNG carriers delivering to the terminal based upon markets and availability of supply," the modification stated.

"Incoming vessels may vary in size from 140,000 cubic metres to 180,000 cubic metres."

The AIE modification states that the extra LNG carriers are not predicted to impact upon vessel movements or navigation within the port.

AIE is a consortium that includes Andrew Forrest's Squadron Energy, Japanese investment firm Marubeni and LNG fleet owner JERA.

The NSW government recognised the terminal as Critical State Significant Infrastructure in June 2018 before granting planning approval to the gas terminal in April 2019.