Vincent, dead chap. While I for one, monitor electricity costs more than most... I'd not blame your PC on the electricity bill UNLESS you're using it, 24/7/52 because it's not to blame.
THE only way it'll be killing your elec bill is either
A: folding at home or similar distributed computing
B: you game, all day,e very day, and never sleep. ever.
Before you ruin your gaming life for ever, go to B&Q and find a Power reading machine. It plugs into the wall socket, and then yuo plug your PC into that.
It tells you how much electricity uyou've used over whatever time scale you leave it plugged in for. AND if you can suss the booklet, you can even input your electricity prices so you can SEE what it's costing.
Frankly, I use mine to monitor the kilawatthours and once I've done that for a week, I grab the elctricity tarrif chart, and work out what it cost me.
So dont blame thew PC yet... more likely to be the immersion in the hot water tank is still on from oember
