I've just check my last electric bill (21 July 2010)
This is what is stated:-
Day Units first 900kWh each year = 30.89 pence each
Next = 12.33 pence each
Night kWh = 4.58 pence each
Standing Charge = 9.16 pence per day
This is the info from my bill. Hope that will help you from pure cost.
There are lots of ways to reduce amount of energy used such as choice of light bulbs,
timing devices and 'stand-by' control devices (for appliances).
There are a number of different tariffs available depending on what you use electricity for and when you use it.
For me the biggest enegy cost is Gas.
Don't know how