Google enters a long term purchase agreement with an Iowa wind farm.

We just completed a substantial 20-year green Power Purchase Agreement that allows us to take responsibility for our footprint and foster true growth in the renewable energy sector. On July 30 we will begin purchasing the clean energy from 114 megawatts of wind generation at the NextEra Energy Resources Story County II facility in Iowa at a predetermined rate for 20 years. Incorporating such a large amount of wind power into our portfolio is tricky (read more about how the deal is structured), but this power is enough to supply several data centers.

via googleblog.blogspot.com