TransAlta Renewables ( TSX:RNW ) had a rough run in 2021. The company saw revenue take a hit after an unplanned outage at a gas-fired power plant, and the discovery of faulty foundations supporting 50 wind turbines. The issue at the power plant has been resolved and TransAlta Renewables has provided cost and timeline guidance on the repair of the wind turbines at the Kent Hills sites in New Brunswick.