kWh stands for kilowatt-hours, and the amount you put here is measured every year. There are 2 ways to find out your consumption amount:
Industry Estimates
The industry standards that we have already added to the signup form are:1 Person 🙍♂️ = 1400 kWh
2 People 👫 = 2300 kWh
3 People 👩👧👦 = 3000 kWh
4 People 👨👨👧👦 = 3700 kWh
From An Old Invoice
If you have an old invoice, simply find the total kWh from your previous bill. If you didn't have any unique circumstances during that time (like working from home, or a long holiday), then you can use this number.