Apple has updated the environment section of its web site to indicate that by the end of the year (if construction goes according to schedule), the Maiden, North Carolina data center will be run 100% from renewable energy.
Apple has listed the data center as requiring 20 megawatts of power at full capacity. Apple plans to produce the majority of its power from on-site solar and fuel cell energy systems. The solar installation will cover two 100-acre sites, with each site able to produce 20 megawatts or 42 million kilowatt-hours of energy annually. The bio-gas powered fuel cell system will add another 5 megawatts of capacity to the system.
Energy needs beyond what is produced onsite will be purchased from local or regional clean and renewable energy sources.
Apple is also in the planning stages for its new data center in Prineville, Oregon, and is planning to power that data center with renewable energy sources as well.
Also in the planning stages is the conversion of Apple's existing data center in Fremont, California to run exclusively from renewable energy sources. In the Fremont data center, this will take the form of electrical supply contracts from clean renewable energy suppliers in the area. You may see the windmills at the Altamont Pass turning a bit faster soon.