Researchers at Carnegie Mellon and the University of Michigan have identified potential cost savings they are calling "PowerNap". The idea is to dramatically lower power usage when a server becomes idle. Idle servers still use energy because even though the server isn't managing any requests the server is still running and consuming power. Clearly if the server could be made to go to a power saving mode it would cut energy use.
A couple issues are server hardware generally doesn't include some critical pieces of circuitry required to manage server idle power usage.
Another issue is operating systems don't know how to grok what time it is if their CPU has been idled for awhile.
Source: PowerNap Targets Server Idle Time
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