It's a bit like asking how much power an electric oven would consume over a given period. It will depend on how much cooking you do.
Allow about 1 kWh per week give or take - so it's 50 kWh per year as a ball-park figure. If you think that low because children are always opening the door then call it 60 and if it's a single-person household then make it 40.
Peccavi, February 2013
