I will provide my numbers. They may be a bit different based on price per kWh. I pay 7 cents where I live. I have my equipment all run into a power conditioner/surge suppressor with a voltage regulator that also shows amps.
Since we know amps and volts we can convert that to watts. My 60 inch Pioneer Kuro Elite Plasma in standby, along with my PS3, and my 40 pound hulking Yamaha receiver in standby. It is also my DVR cable box and my DVD upconvert player/stand alone blu-ray player . It is also my subwoofers. All together they draw .8 amps in standby.
So watts= Amps X Volts
.8 X 120 = 96 watts an hour
Now we will convert watts to kWh using watts X 8760 (hours in a year) divided by 1000 to get kWh
So 96 X 8760 / 1000 = 840 kWh
840 kWh at 7 cents per kWh = $58.60 a year
Remember this is with my tv, PS3, receiver, cable box, subs and DVD/Blu-ray player all connected and in standby.
While in use it fluctuates but I will go with an average of 5 amps. So with the same formula
5 X 120 = 600 watts an hour
600 X 8760 / 1000 = 5256 kWh
5256 kWh at 7 cents per kWh = $367.92 a year
Obviously that would be based on 24 hours a day never shutting off. Realistically you can take away 8 hours for work, 8 hours for sleep and in any given day I would average running it about 8 hours a day. Days off about the same as I run errands and do other things.
So 1/3 of that would be $122.64 while operating per year.
The other 2/3 of the time it would be in standby. So $39.06 in standby per year.
Add those together total cost would be $161.70 per year for my entire Home Theatre system. DVR cable boxes are among the worst devices for electrical uses in a modern home. So even with all of that taken into account you can see the amount really isn't much.
Basically about 44 cents per day for my entire system. I'm factoring in more juice than most average gamers. Even if my volt and amp meters are slightly off and needed calibration, for debates sake lets double the number and say I use twice as much as reported. It would still be under $1 a day for my entire system.
When you actually do the math it isn't as scary as most people would try to lead you to believe.
PSN ID: sled_dogs76 60" Pioneer Kuro Elite PRO151FD, Yamaha RX-V3900 A/V Receiver, Oppo DV983-H player. Coming soon: 2 Seaton Submersives from Mark Seaton