Solar and wind power devices are great. Yes, they don't use any "fossil fuel"
They also don't do squat at night (solar) or when the wind isn't blowing.
Even solar/wind power aficionado's usually have a generator hidden somewhere so they can charge the batteries when Nature screws them
Both these options require large storage provisions if you plan on using them during the "bad" times. Batteries for Deep Cycle storage like this cost through the anus