Mining giant Rio Tinto is using surplus water from its Marandoo mine in the Pilbara to irrigate fields of hay.
The company said today water had begun flowing at its agricultural project, 45km northeast of Tom Price.
Seeds will be planted this week and the first hay is expected to be harvested before Christmas.
More than 30,000 tonnes of hay will be produced per year once the project is fully commissioned, Rio Tinto said.
Some will go to the company's six pastoral stations in the Pilbara and the rest will be available to other interested pastoralists in the area.
Five of the stations are managed by Rio Tinto and collectively run about 25,000 head of cattle.