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This is a growing trend that is good for a number of reasons; PR, environmental stewardship, and energy savings to name a few. Many of the biggest tech companies have demonstrated a commitment to greener data centers, including Google, Facebook. and Apple. These efforts range from using sustainable sources for generation of energy to building data centers in places where the natural environment can be used to dramatically decrease the need (and expense) of cooling data centers. Hardware manufacturers like HP have also contributed to greener data centers with more efficient servers and servers that can safely run at higher temperatures than was possible in the past.
Check for ISO 50001 certification of data centers, which shows a high level of commitment to energy efficiency and indicates that the company has a plan for continued improvements in the future. Google has a website that shows some of it’s energy conservation efforts. It’s pretty interesting and worth a look. https://www.google.com/green/efficiency/