On a less divisive note than peering/transit, over in the Netherlands EvoSwitch has taken the push for renewable energy usage by data centers to another level. Through a partnership with Nuon Energy, they are bringing wind energy into their power mix.
To be more specific, they have 'contracted specific Guarantees of Origin coming from Dutch Wind Parks to an equivalent of an 800kW wind turbine at Nuon’s Enkhuizen wind farm'. In other words, EvoSwitch now has an actual windmill with their name on it, and they can offer 'sustainable' colocation powered by wind energy to customers that want it.
Wind energy is about as green as it gets, but it isn't terribly cheap and it is quite variable over time. That EvoSwitch is bringing it into their mix suggests, however, reflects the both the attention renewable power sources have been getting in Europe and the progress that is being made in bringing the technology to the mainstream.
I wonder if they'll be doing something similar at some point at their new facility down in Manassas VA.