The budget samples linked by @Helix (I need a reality check, am I living a high standard lifestyle? - #19 by Helix), which are, if memory serves, based on countrywide averages, have electricity between 70.-/90.- per month for a single without kids, depending on means (I would say dependent on the size of the lodgings).
My own bill is around 100.-/month with a 40m2 individual “house”, poor insulation and electric heating, electricity at 33ct/kWh.
I would use your planned 80.-/month value as a good enough estimate for a start and adjust it when you get your actual final bill later on (since it’s a different appartment and lifestyle for you, it’s hard to assess your future consumption without actual data).
10.- / 20.- per month won’t make or break your budget, you can deal with a bit of uncertainty on that position.