It’s not so strange that large companies like Google, Yahoo and Microsoft recently turned to wind energy to power their enormous data centers. Rather, it’s simple math: Wind energy is becoming surprisingly cheap. A new report released by the U.S. Department of Energy shows that the price of wind energy in the U.S. is currently at an all-time low, averaging under 2.5 cents/kWh. It has to be said that these prices are based on a sample of projects that largely hail from the lowest-priced central region of the country. Also, it’s important to note that costs would not be so low without the wind production tax credit, which covers wind projects that began by the close of 2014. But wind energy is now certainly cheaper than the average price of wholesale electricity in many parts of the country. The average retail price of electricity in May was 10.45 cents per kWh, according to the U.S. Energy Information Administration.