The company will resell the energy back to the grid and retire the Renewable Energy Certificate associated with the power.
Urs Hoelzle, Google senior vice president, operations, said: "We’ve been excited about this deal because taking 114 megawatts of wind power off the market for so long means producers have the incentive and means to build more renewable energy capacity for other customers."
The company will by the energy from the 114MW NextEra Energy Resources Story County II facility in Story and Hardin counties in Iowa.
Google announced in 2007 that it would become carbon neutral.