We've covered plenty of wind turbines over the years, but most tend to be awfully conceptual or rather unsuited to consumer applications. Being eco-geeks at heart we're happy to report on a new one that is both consumer-friendly and in production now. Mariah Power's Windspire is a 9 meter tall vertical turbine intended for residential or commercial installation, capable of providing about a quarter of the power an "average" househo
