Venture Global LNG Inc. said Sunday it would acquire a fleet of nine liquefied natural gas tankers, becoming the first U.S. producer of the super-chilled fuel to own vessels as it continues to integrate its operations. 

The vessels are currently under construction in South Korea. Six of them would have the capacity to carry 174,000 cubic meters of LNG, while the other three would have a 200,000 cubic meter capacity. 

The ships would burn LNG for propulsion. They would also have both the highest fuel efficiency and lowest greenhouse gas emissions of currently available carrier technology, the company said. 

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Venture Global brought the 10 million...