Vestas will deliver a mixture of its V112-3.45MW and V117-3.45MW turbines to the Mt Emerald wind project in northeast Australia.
The manufacturer will be responsible for the engineering, procurement and construction (EPC) of the project.
Installation is expected to take place in the first half of 2018 and a servicing deal would cover the site for a further 15 years.
The project has agreed a power purchase deal with local utility Ergon Energy to buy the output until 2030.
"Once completed, the project will take Vestas' total turbine installations in Australia to more than 2.1GW," said Vestas head of sales and business development in Asia-Pacific, Gerard Carew.
"In the end, the decision for us came down to the low cost of energy and proven performance of the Vestas turbines," said Ratch's general manager of business development, Anthony Yeates.
The order is Vestas' second in Australia this month. It also won a 30MW EPC deal from developer WindLab for a project in Victoria.