The mobile communications company‘s American arm will receive 160MW from Infinity Renewables’ 474MW Solomon Forks project in Thomas County in the northwest of the state, which is due to go online next year.
It had previously signed a power purchase agreement (PPA) with Enel Green Power for 160MW from the its Red Dirt site in Oklahoma, which was commissioned in January.
T-Mobile also announced that it has joined RE100, an alliance of companies committed to 100% renewable electricity, and set itself a deadline of 2021 to achieve this target.
The two 160MW PPAs will enable T-Mobile to meet about 60% of its electricity needs in the US through renewable energy, the company stated.
It added it would buy more wind power to reach its 100% target, "buying only from projects that wouldn’t exist without T-Mobile’s involvement".
John Legere, president and CEO at T-Mobile claimed that the company expected to cut its energy costs "by around $100 million in the next 15 years thanks to this move".
He added: "It’s not just the right thing to do — it’s smart for business."
Solomon Forks will also provide chain store Target with 100MW of power when it is completed. The power Target bought through a PPA in August will provide 100% of the energy it uses at 150 of its stores, the company stated.
T-Mobile’s power deal for the site — for which turbines have not yet been selected — is part of a trend of large companies signing PPAs with wind developers.
Nike, Google, and the San Francisco Bay Area’s public transport system had all signed wind PPAs in the last two months.
In vowing to source 100% of its power from renewable sources, T-Mobile also joins Microsoft, Facebook, and other companies as part of RE100.
Sam Kimmins, head of RE100 at the Climate Group said: "As a large electricity consumer in the US, they can truly transform energy systems by bringing significant renewable capacity online — all of that while delivering real value to their customers."
