Fonterra Australia plans to spend A$165 million ($179.4m) in its current financial year on key sites in Victoria and Tasmania to increase capacity needed to process the extra 400 million litres of milk that now flows the co-operative's way.
The investment was first signalled by chief executive Theo Spierings when the co-op's annual result was released in November last year.
Fonterra's managing director for Australia, Rene Dedoncker, said Fonterra's Australian milk pool had grown by 400 million litres this season.
"And with this new investment we plan to grow our milk further which we expect will come through growth from our existing farmers who wish to grow, coupled with milk from new suppliers joining Fonterra," he said in a statement.
Fonterra's increase in milk supply has largely come at the expense of its main competitor, Murray Goulburn, which has seen its supply shrink sharply after hitting financial difficulties last year. Saputo, one of Canada's largest dairy producers, last year agreed to buy Murray Goulburn for A$1.3 billion, including debt.