The Little Secrets Behind Apple’s Green Data Centers | MIT Technology Review

More Apple power strategy details

"While clean, renewable energy gets most of the attention, Apple likely spent at least as much engineering effort to make its data centers very energy efficient. The Maiden facility, for instance, has massive cold water storage tanks that allow its chillers to reduce peak-time energy demand, saving energy and Apple higher power chargers. It also has precision air flow handlers to minimize energy use and the facility will use outdoor air for cooling most of the time. Chilling typically represents about half of a data center’s energy use.
In an interview with Bloomberg, Apple’s chief financial officer Peter Oppenheimer said that, “We think these efforts will result in learnings that other companies and communities can benefit from as well.”"

The Little Secrets Behind Apple’s Green Data Centers | MIT Technology Review