At least here the electrical service base rate is largely set by the max amperage you can draw from the grid. I'll use my own home's electricity cost breakdown as an example (all listed prices, even the additional tax, include our 25.5 % VAT)

1. Monthly base rate for your main breaker, depends on your grid operator – mine is 7.63€ for 3x25 A connection (among the cheapest grids in Finland, I previously used another example often seen in smaller cities, which is 29.71 €/month)
2. Transfer costs, 0.0187 €/kWh during day, 0.0089 €/kWh during night
3. Electricity tax, 0.0282752 €/kWh, includes national energy security taxes as well
4. Cost of the actual electricity, typically ranges from -0.05 €/kWh to 0.20 €/kWh with yearly average being about 0.055 €/kWh
5. Electricity company's margin for spot prices, 0.004 €/kWh
6. Electricity company's base rate, 4.90 €/Month

For many cities in Finland the base rate for grid connection is considerably higher, and especially for apartments tends to be the majority of your electricity bill outside major urban centers. Even in cities it makes up a large percentage, so there's a big incentive to not overspec your service.