Lick my balls, bro.
Buying "carbon credits" and the like don't mean that you're actually using sustainable energy. What happens when the wind plants and solar plants aren't producing? Covering average demand is ONLY covering average demand. Idiots.
Its an accounting trick. They are actually using energy produced by non-renewable generators much of the time. They are simply signing contracts and paying a bit more to say it comes from renewables. Meanwhile, every neighbor is using the exact same mix of power from the exact same generators. The only difference is the piece of paper..
No, there's a little more to it than that. The fact that they're paying more for renewable means that utilities can afford to invest in more renewable production. Buying renewable energy, even if it does get all mixed together with non-renewable in the grid, actually causes renewable energy production to be built out -- and eventually to replace non-renewable production.