Just an aside...
If you do in fact have peak and off peak rates (ours are 7am-11pm peak, 11pm - 7am off peak + the whole weekend), you can get very clever at making your electricity bill cheaper.

These are my tricks:
Oven on in the weekend only (for a mass muffin baking session)
Washing maching on delay start so that it finishes before 7am
Dishwasher on delay start so that it starts after 11pm
Dryer on in the weekend (or not at all if possible)

Of course there are times when these rules can't work - but it's good to try. Our off-peak is one third the price of the peak.