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This question already has an answer here:

Is there a way to know the current (or average power consumption) on OS X (a Mac Mini without battery). Preferred would be a command line tool but anything is OK.

marked as duplicate by klanomath, Lizzan, nohillside Nov 16 '15 at 11:42

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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You can monitoring your energy consumption with :

iStat Menus :

enter image description here http://bjango.com/mac/istatmenus/

You also have some free alternative on the web

The Activity Monitor

enter image description here http://www.tekrevue.com/tip/use-activity-monitor-energy-tab-os-x-mavericks/

And if you want to know the kW energy consumption, ArchonOSX is right.

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I use a Kill a Watt to check track power consumption of household items.

http://www.amazon.com/gp/product/B00009MDBU?keywords=kill%20a%20watt&qid=1447667271&ref_=sr_1_1&sr=8-1

By going with this you can also check other items in your household to see how much power they consume and reduce your energy use.

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