Apple is expanding its use of clean energy to power its iCloud data centers, with the company’s Prineville, Ore., facility now flanked by a small hydroelectric project acquired by the iPhone maker. The company’s new purchase was revealed on Saturday by The Oregonian, which noted that initial proposals for the project indicated it would generate between 3 and 5 megawatts — enough to power 2,000 to 3,500 homes, but still only a tiny amount of the power Apple will need to run the facility