The Energy Saving Trust has an excellent website covering all things from saving energy to fitting a wind turbine to your home. It includes subjects such as:

• Grants
  
• Wind turbines
• Solar water heating
• Solar electricity
• Micro combined heat and power
• Ground and air source heat pumps

The really good bit is that you are given an idea of the potential costs and savings involved

There is also a handy wind speed calculator so you can see if a wind turbine is appropriate for your area.