Westlake Chemical will spend $330 million to expand its Sulphur plant, a move that will create 25 jobs.

The move will increase the plant’s capacity to produce ethylene, a building block for plastic products, by 250 million pounds annually, the company said Thursday. This will increase Westlake’s global ethylene capacity to 3.6 billion pounds a year.

Louisiana’s economic development department said the 25 new direct jobs will have an annual payroll of $2 million, plus benefits. More than 160 indirect jobs will be created in Calcasieu Parish. At its peak, the expansion will support 1,000 construction jobs.

Houston-based Westlake said it will complete the expansion in late 2015 or early 2016. Hiring for the new jobs will begin at the end of 2014.

LED’s Business Expansion and Retention Group began discussing the expansion project with Westlake in May. To secure the project, LED offered the company an incentive package that includes a $2.5 million Modernization Tax Credit, to be claimed over five years. The company also is expected to utilize Louisiana’s Quality Jobs and Industrial Tax Exemption programs.