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  • I get "The power efficiency diagnostic library (energy.dll) could not be loaded". Why might that be? (the Power service is started) Commented Apr 17, 2013 at 0:54
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    Incase this is driving anyone else nuts: To open energytrace.etl open Event Viewer | Click Event Viewer (Local) in tree | Action | Open Saved Log | open C:\Windows\System32\energytrace.etl Tell it to convert to the new log format. Works on windows 10. Commented Mar 19, 2016 at 10:27
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    In Windows 10 just run powercfg /energy and a web page will be created instead. Commented Feb 17, 2018 at 22:30