Smart TVs eat power too
I've a Sony KDL - 40W600E smart TV. The damm thing takes 7 watts on standby and about 45 watts when running. This works out at over 60KWH/year when it isn't doing anything useful for me! I only use it as a monitor on my laptop anyway.
The only time I notice the so called smart features is when it decides to update itself and refuses to let me actually use it during this time. It could at least have updated itself during the standby period. The TV is a pile of junk and I wish I'd never bought it.
 I now have it on a remote power switch which takes 0.2 watts and saves me from looking for the TV remote control as well as the lighting control.