Mariah Power says its Windspire vertical-axis wind turbine is now commercially available, after having passed performance tests.
The Windspire costs $4,995, which includes the inverter, pole, and other equipment.
Mariah Power said the Windspire is aimed at residential customers in urban, suburban, and rural areas. It has already been installed in a handful of U.S. locations.
"(Its) efficiency is on par with most propeller-based wind turbines, but it is priced much lower. It is also … Read more