Mercury plans to build a new $115 million, 43 megawatt wind farm at Kaiwera Downs, south of Gore.
Auckland-based Mercury said it had executed contracts for the procurement and construction of the first stage of Kaiwera Downs.
The company said the project would lift Mercury's total financial commitment to new renewable wind generation to almost $600m since 2019.
"This wind farm is part of a significant renewable growth pipeline for Mercury, with several other renewable projects under investigation," chief executive Vince Hawksworth said.
"Mercury is committed to supporting New Zealand's decarbonisation goals and one of the most meaningful ways we can do this is through building and supplying more renewable power," he said.