Congratulations on the new P12! I am loving mine and I’m still within break-in period!
I leave all my outlets on all the time. I just power off the screen and the power button. I haven’t noticed much increase in my power bill. I think this is really the only way to do it, because I want to keep my other components luke-warm in their stand-by modes. Have a DirectStream Junior, Esoteric K-05 sacd, VPI Classic 4, Luxman L-590AXII integrated, Xbox one-s, direct tv receiver, harmony hub, and Amazon echo dot all connected to the P12. It handles them all with ease!