Japanese soy sauce producer Kikkoman has announced plans for a US$100m expansion over the next ten years at its main US plant near Lake Geneva, Wisconsin.

The Walworth County plant was first opened in 1973 as Kikkoman’s US headquarters. It now produces 25 million gallons of soy sauce and related products each year.

When completed, the expansion will provide an additional 40 jobs to the 150-strong workforce, an increase in size of the plant from 550,000 square feet to 710,000 square feet and an annual production capacity of 34 million gallons.

Kikkoman, which also operates a smaller plant in California, said demand for Kikkoman soy and teriyaki sauces has grown and the company must therefore increase production in the US.

“The general American people have started using soy sauce for their own American dishes,” Yuzaburo Mogi, president and chief executive officer, was quoted by The Associated Press as saying. “Demand for soy sauce has increased.”