The reason it is an option is not because it is a green tech, so much as it is simply 'not gas/coal/nuke' power. The green movement is less about saving the environment, and more about replacing current energy monopolies with their own energy monopolies.
I'm not against better power sources (specifically solar, nuclear, and fuel cell tech), but wind, bio-gas, and biomass all have some weird drawbacks and consequences which need to be considered if it is really to be labeled as a truly 'green' tech.
... If we could just find the magic key to make better batteries (which is steadily improving, but has not really 'arrived' yet) then we could all move to solar and reserve fossil fuels for air travel and military use. Solar is already available at 22% (which is enough to power even some power hungry homes when available roof space is considered), and has a pay-off of under 10 years, which means that it is almost a viable tech for home-owners like myself. Once they get the payoff to under 7 years (preferably under 5) then you will begin to see mass adoption of the tech.