Microsoft made the biggest single corporate purchase of solar energy in American history this week.

The tech giant confirmed Wednesday it had bought 315 MW from two solar projects located in Virginia, which will support its plans to have 60% of electricity at its data centres come from renewable sources by 2020.

“We’re signing the largest corporate solar agreement in the United States, a 315 megawatt project in Virginia that will move us ahead of schedule in creating a cleaner cloud,” explained Brad Smith, president, Microsoft. “This project means more than just gigawatts, because our commitment is broader than transforming our own operations; it’s also about helping others access more renewable energy.”

It follows recent clean power deals made by Microsoft in India and Singapore; and in an American context is reflective of the growing movement across the country towards a future powered by renewable energy.