The main problem with renewable energy is storage. A wind turbine will only produce useful energy when the wind blows, even then it needs to be not too much or too little. So the output can be very erratic you will probably need lots of storage cells (batteries) and an inverter to convert the DC from the cells to AC for your supply. Same goes with pv solar panels, you only get an output when the sun shines, so it'll produce electricity all day but come Coronation st. time the sun goes down and the electricity stops.
The best systems I've heard of are ones which integrate to the national grid, so during the daytime when your system is working you feed into the grid (and your meter actually runs backwards) then at night when your system stops you take your electricity from the grid as usual.
There was a lady on the news recently who had pv cells on her roof, it was a big house and the roof was completely covered. Her system cost �25K and her bill for the year was just �5. But it'll take around 25 years to pay back the installation cost alone ( assuming she uses �1000 of electricity per year, more likely she uses �300 per year so it'll take 83 years to pay back). Something to think about. If you want to save the planet you need deep pockets.