Viterra is spending $20 million to upgrade capacity at its Saskatchewan grain terminals. (CBC)

Viterra Inc. says it will spend more than $20 million to upgrade four of its grain terminals in Saskatchewan, where the company has its roots.

The company will increase rail capacity at all four locations while the operations in White Star and Humboldt, Sask., will also get more storage.

The company said storage capacity at White Star, north of Prince Albert, will be tripled while capacity at the grain elevator in Humboldt will be doubled.

The company's Waldron and Ituna facilities as well as Humboldt are served by Canadian National Railway while White Star is on the Carlton Trail Railway, which runs from Prince Albert to Saskatoon.

"This project is the latest in a series of improvements designed to increase our level of service and, combined with the knowledge and expertise of our grain marketing specialists, further strengthen our partnership with local producers," said Kyle Jeworski, Viterra's president and CEO.

Viterra was acquired for $6.1-billion by Glencore International, a Swiss commodity broker, last year.

The Glencore deal included a side agreement to sell a large chunk of Viterra's business to two other Canadian companies — Agrium Inc. and Richardson International.