There's no grant, I'm afraid - the technologies approved under the Greener Homes scheme are Solar heating, Heat pump, Wood chip or pellet stoves, and Wood chip or pellet boilers. You'll get the full details on the scheme on the SEI website, at [broken link removed]
If you are planning to install a wind turbine, make sure you check the planning implications - they can be noisy, too, so are often not ideal in a high density urban / suburban environment.