Facebook Inc's $US500 million ($A667 million) data centre in Fort Worth, Texas, will be entirely powered by renewable energy thanks to a 200 megawatt wind project nearby. The data centre will come online next year.

It has collaborated on the Clay Country wind farm project with Citigroup Energy, Alterra Power Corporation and Starwood Energy Group.

Facebook plans to power the rest of its data centres with at least 50% renewables by the end of 2018.

Its long-term goal is 100% so the carbon impact of one person's yearly Facebook use is roughly the same as the impact of one medium latte, a previously overlooked measurement of energy usage that Energy News feels should be adopted.

The company will invest at least $US500 million in the 110 acre facility, which is expected to come online late next year.

The location will be the data collection concern’s fifth such facility, joining existing data centres in Iowa, Oregon, North Carolina and Sweden.

For sustainability, the Fort Worth data centre will be cooled using outdoor air rather than energy-intensive air conditioners, thanks to technology it pioneered in its Oregon location.

Facebook said its infrastructure efficiency efforts helped it save more than $US2 billion over the past three years.

E-tailer Amazon also announced a goal of 100% renewable energy for two new data centres in the US and India but so far has not elaborated on how it would meet that goal.