There’s really not much to fuzz about. An idling NUC will pull about 10W, and actually my full size Asus ROG B360 with a standard Core i3 8100 only consumes a few watts more.
I love the availiability of Roon and wouldn’t dream about power off my Core(s).
Ypu can find power consumption figures and processing speeds for a lot of examples in the Performance Matrix spread sheet, link in the first post here