The dream was to have all Kiwis drinking only oat milk produced in Southland, he said.
"The oat milk value chain in New Zealand is broken because we don't have a large-scale manufacturing facility capable of producing quality oat milk that customers want.
"With this initiative, we have the capability to do that. We certainly will be able to produce as good - if not better - [product] than any other oat milk factory available around the world."
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While the first product would be oat milk, there was potential for the production of any plant-based beverage, he said.
Nash believed the industry had enormous potential for the country.
"It is only a small portion of the money that needs to be raised but it recognises [that] we've got to move away from growing, sending overseas and then importing back the finished product. We've got to be able to do it here and keep the wealth here."
He said in his own cafe in Napier, he had noticed a huge increase in demand for plant-based milk in the past months.
Their staff had used about two litres of oat milk weekly and now was using about 10 litres, he said.
"Plant-based milk alternatives are a fast-growing segment of domestic and international consumer markets, with the amount spent by Kiwis on plant-based milks almost tripling from $52 million in 2017 to $144 million in 2019 - so the demand is definitely there."
It was not a matter of dairy milk or oat milk, it was about adding another innovative and profitable industry to the region and both would work together, he said.
"Of course, dairy will continue to play a very important role in the country's production moving forward.
"We know that oats grow well in Southland, and being low in water use, land use and emissions, they are an excellent raw ingredient for an environmentally sustainable alternative-milk option."
The funding for the new factory will come from the Regional Strategic Partnership Fund - the successor to the Provincial Growth Fund.