System specs:
M/B: Asus Z170-A
CPU: Intel Core i7 7700
Memory: 16 GiB DDR4
Storage: 5x HDD, 1xSSD (Cache)
Expansions: Dell H310
Parity check: 78-82W
All HDDs spun down: approx. 50W
S3 sleep (roughly 67% of the time, but can often stretch to 2-3 days): 16W (not sure how accurate my power meter is for sleep. I think it should be less)
Don't use any dockers or VMs which need to be on 24/7. Via WOL, server wakes up and is ready to stream in about 20 seconds or so, which is good enough for me (my old N54L, which does not support S3, was closer to 3 minutes). Due to frequent power outages I have battery backup for the house, so every watt saved helps to extend battery life. To save more power I really should shut down the server more often, but it would take longer to start up and the drives would spin up on every start up (they remain idle when server resumes from sleep).
Using a NUC to evaluate Home Assistant. Would probably keep using that (or similar) for home automation.
@Morrtin thanks for your nice format.