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Chips could harvest their own energy using a newly-created alloy
(www.techspot.com)
This is a most excellent place for technology news and articles.
It might be interesting to use waste heat to power fans. That's right in that range for power needs, and it could be largely self-contained.
For something like a data center, that could add up.
Data centers will probably be the only practical application. Consumer electronics will probably barely produce enough energy to power the regulator and tie-in circuit just to feed back into the pwm driver for fans nowadays.