Construction company CB&I has been awarded a $300 million contract for Williams Olefins LLC’s ethylene project in Geismar.

Ethylene, mainly produced via steam cracking, is a primary building block for the chemical industry, used to produce a variety of products including plastics, fibers and rubbers.

The Williams Olefins project will increase production capacity from 1.35 billion pounds to 1.95 billion pounds per year.

In a news release, Philip K. Asherman, CB&I president and chief executive officer, said the United States’ petrochemicals market is re-emerging because of the abundance of lower-cost ethane feedstock, which is directly attributable to increased shale gas production.

CB&I is based in The Woodlands, Texas. The company was founded in 1899 as Chicago Bridge & Iron Co.