I got that figure from my last bill, they always add graphs and comparisons, like a bar chart displaying usage of a typical 1, 2, 3, 4 person household and then your usage. But maybe they show lower values here to get you to try and save more.

I'm in a two person household and usually clocking in at 700-900kwh, and that's with a 24/7 home server drawing 30W, a rpi for kodi that I keep running, dish washer, washing machine, induction stove. No ac, no dryer, no microwave, hot water and central heating with natural gas. Also no more desktop pc since around 2014.