Starting from early 2015, Google will buy all of the power from the 29 Vestas V90, V100 and V112 turbines, as it looks to move towards its 100% renewable energy target.
The four wind farms are Skalleberg in Hjo municipality, Mungserod in Tanum municipality, Ramsnas in Laxa municipality and Alered in Falkenberg municipality.
This latest move is not company's first investment in the Swedish wind industry. In June, Google signed a ten-year agreement with developer O2 to buy the power from the 72MW Maevaara wind farm to be built in north Sweden.
Earlier this month Google bought a stake in the 182MW Panhandle 2 wind farm in Texas.
To date, the Silicon-Valley firm has invested in 16 renewable energy developments, including seven wind projects, as it looks to reduce its carbon emissions, particularly from its energy-intensive data centres.
These projects accounted for 22% of the company's total energy consumption in 2012. Along with green power bought from the grid, 34% of its power came from renewable sources.
The nameplate capacity of Google's renewable energy projects is now more than 2GW as it pushes towards its goal of using 100% green energy by an unspecified date.