Eco-electricity-house

I will be figuring out the amount of electricity our house uses per month and the maximum amount of energy that could be generated via means of photovoltaic, wind on the property. Unfortunately, stupid zoning laws prohibit wind turbine construction. I don't plan on photovoltaic on the roof because until we at least get our roof replaced which is a long time in the future (if they are installed and we need to replace the roof in 8 years). I am just wondering what it takes to power the average houseful and not be connected to the grid.