Small roof-mounted wind turbines usually aren't more than 0.5-1.5 kW, and cost around £2,000 to 3,000, including installation. Standalone (or pole-mounted) turbines can vary a lot in size and, therefore, in price. They can cost anywhere from £7,000 for a 1.5 kW system, to £70,000 for a 15 kW system. 18 Jul 2023