An Australian invention could make cheap micro-generation via wind power far easier. Graeme Attey has designed a modular wind turbine small enough for the roof of house, and with fully enclosed blades. It seems that without large blades, more of these
The gravitation water vortex power plant is a type of micro hydro power plant which is capable of producing energy using a low hydraulic head of 0.7–3 metres (2 ft 4 in–9 ft 10 in). The technology is based on a round basin with a central drain. Above the drain the water forms a stable line vortex which drives a water turbine.
"Stormblade:" The First Truly Quiet Residential Wind Turbine