Richards Bay Minerals, a unit of Rio Tinto, has inked a 20-year power purchase deal for 140 MW from the Khangela Emoyeni Wind Farm in South Africa.

The wind farm, built by African Clean Energy Developments and partners, aims to generate 460 GWh annually, cutting Richards Bay Minerals' carbon emissions by 20% and reducing traditional energy use by 26%.

Commercial operations are expected within 28 months.

Richards Bay Minerals' energy mix will also include the Bolobedu solar farm, covering 42% of its energy needs.