The project—which would be first new oil refinery to be constructed in the U.S. in 50 years—is expected to produce 1.2 billion barrels of light shale oil worth $125 billion and 50 billion gallons of refined products valued at $175 billion.

A new oil refinery planned for Brownsville could bring thousands of jobs and a major energy investment to the region. But it could also pose risks to the region’s environment and water supply.