For PC, using this site http://powersupplycalculator.net/
I Get Idle ~100w, Load ~460w
So lets take 3 hours gaming, 1 hour idle per day. Simplifying things a bit, this gives me 1480w used per day. 1.48kW x R1.20 (price per kW) = R1,78 per day.
R1,78 x 365 = ~R650 per year.
Not cheap belonging to the master race.
