Cheniere Energy Inc.’s Sabine Pass natural gas export terminal has gotten its first fuel deliveries, according to data analysis firm Genscape.

The small shipment indicates that Cheniere has begun the commissioning process, the testing that makes sure the Cameron Parish facility is working correctly. Cheniere has said it expects the natural gas liquefaction facility’s first production unit will be operating by the end of the year. Sabine Pass is the first LNG export facility built in the United States in more than 40 years.

Sabine Pass has been approved for six production units, known as trains, capable of processing more than 3.5 million cubic feet of natural gas each day. The $18 billion facility chills the gas to minus 260 degrees, turning the gas into a liquid that takes up 1/600 of the space, and makes it feasible to transport by ship.