NextDecade Corp. has landed its second long-term agreement for liquefied natural gas (LNG) with a Chinese buyer in less than two weeks as it shores up offtake ahead of a possible summer sanctioning of its South Texas export project.

The Houston-based company announced Wednesday a 20-year sale and purchase agreement (SPA) with ENN LNG Pte Ltd., a Singapore-based subsidiary of one of China’s largest private gas buyers, ENN Natural Gas Co. Ltd.

Under the SPA, ENN LNG would secure 1.5 million metric tons/year (mmty) of LNG from the proposed Rio Grande LNG terminal in Brownsville, TX. The LNG would be indexed to Henry Hub on a free-on-board basis.

NextDecade CEO Matt Schatzman said Rio Grande’s “commercial momentum” was “accelerating” from a “strengthening LNG market,”...