When the electicity bill comes, I usually phone up to give a meter reading. They use an estimated reading, but I like to keep it accurate in order to avoid any surprise charges at the end of the year. Last July I decided to jot down those readings myself in a spreadsheet, and take my own reading every few weeks just to keep track of how much electricity I use.
The reading is in kWh (kilowatt-hours), which is to say that if our house were to use 1kW for an hour, the meter would go up by 1 unit. In my spreadsheet I’ve noted the date in column A and the reading for that date in column B. On each row I’ve calculated our average power consumption for the period since the last reading, so cells in column C have a formula like “=(B7-B6)/(24*(A7-A6))” (kilowatt-hours used divided by hours between readings).
When I started, the average electricity usage for our household was 403W. In the last month, this has gone down to 312W (or 2,734 kWh in a year).
What’s the average power consumption of your household? I tried to find out the average UK domestic household power consumption, but got lost in a maze of statistics. At one point I wrote down that it was 3,300 kWh/year, which works out as 377W. I didn’t save the link though, so I don’t remember where that came from.