It will sell output from the up-to 60-turbine Golden South project to utility SaskPower for 25 years.
The utility launched the tender last year and received 29 bids for projects with an average price of C$42/MWh (US$32.06/MWh).
It did not disclose the value of the winning bid, but said Potentia’s offer was "well below" the average price.
Potentia, which has a development pipeline of 1,970MW, according to its website, said Golden South could be commissioned in 2021.
The developer does not yet have any operational projects.
SaskPower said it expects the next tender for another utility-scale wind farm to start in mid-2019. The utility aims to have renewable energy provide 50% of its generating capacity by 2030.
It also plans to reduce greenhouse gas emissions in the central Canadian province by 40% by this date.
Robert Hornung, president of the Canadian Wind Energy Association (CAWEA), said that wind power is "poised to make an important contribution" to these targets.
He added: "The high level of interest in this procurement shows that wind energy developers are ready to invest in the province as it reliably increases the integration of this low-cost, non-emitting energy into the supply mix."
There is currently 221.16MW of operational wind capacity in Saskatchewan, according to Windpower Intelligence, the research and data division of Windpower Monthly.