So, it is a demand charge, levied at the peak demand of your house? And it is the same for all users?
That superficially seems to make sense, but there is always the debate whether you should pay it if your peak is not co-incident with the local/system peak
Electricity tariffs should be cost reflective, e.g,. in Norway we will soon have:
T&D tariff:
Monthly peak demand charge to cover the grid investment*
Variable per kWh charge to cover losses
Fixed fee per connection point to cover fixed costs (e.g., billing system/customer service etc.)
Note that the total income from the T&D tariff of an utility is regulated, but the tariff design makes sure everyone pays for the benefit they get, they explicitly changed from large variable per kWh fee to a larger monthly peak demand charge to make sure people make decisions good for the grid (e.g., not charge at the same time as making dinner, solar owners still paying for the grid which is scaled to winter peak when there's no sun)
Electricity retail:
Hourly wholesale price
Surcharge per kWh to cover trading costs etc. + profit for some retailers
Fixed fee per connection point to cover fixed costs (e.g., billing system/customer service etc.)
Electricity tax billed per kWh consumption
If you have solar you avoid the variable T&D tariff part + wholesale electricity price + electricity tax
If you send solar to the grid you earn the hourly wholesale price
* This may be time of use tariffs instead, with a high charge in peak hours, and low during e.g., the night