Apple's main iCloud data center in Maiden, N.C., will be powered entirely by renewable energy by the end of this year with the construction of two solar array installations. The feat will be accomplished with the construction of both new solar arrays around the existing North Carolina facility, Reuters reported on Thursday. Together, they will supply 84 million kilowatt-hours of energy per year. The new solar installations will also reportedly rely on high-energy cells and an advanced solar tracking system. The announcement comes as Apple has been under fire from Greenpeace, which has called on Apple to build a "clean" iCloud rather than relying on coal-powered electricity.