Now read this:
Want to power your house from the Sun etc?
+ get £25 Amazon voucher at the same time? Go to http://10ws.co/1OxVUeS and switch energy providers, you may be saving money on their standard tariff but most likely will be spending £5-£15 extra per month to have it fully renewable. Obviously this will vary for each person so double check.
For reference the power is generated by wind, solar, geothermal, wave, tidal, hydro, biomass, landfill gas, sewage treatment plant gas and/or biogas power sources.