"PhotoshopUK", as you might have read above, for a lot of people that only worked till the next time you close the lid on your MacBook. Don't know what happens when your 27" is sent to sleep. I assume same problem? "sudo pmset schedule cancelall" is not a permanent fix for most of us!! Be happy if it went away permanently, but do not hold your breath...

Don't want to burst you bubble, but I was there!!! After closing the lid on my MacBook and waiting a while, "powerd" will be back!! Seems to only come back after "sleeping", not when you just turn of your MacBook and restart it.

Sorry to say that all fixes proposed in this thread work, until I close the lid on my MacBook. At that point something gets "powerd" very mad and it starts sucking resources about 5-10 minutes after the MacBook was closed. "[0] wake at 04/12/62 01:47:16 by 'com.apple.alarm.user-visible-com.apple.email.SendLaterDelivery' User visible: true" this is what appears after typing "pmset -g sched" in the terminal. "pmset schedule cancelall" does work, but only until the lid is closed.

Tried this, lets see what happens. "pmset -g sched" only shows the sleep event, not the wakeup. Is that correct? Does not seem correct, but what do I know....