Unteresting discussion about electricity prices because I've had a similar experience a while back.
Electricity company upped my "predicted" monthly downpayment from 180 to 330€ because of "reasons". I was of course sceptical of these reasons, thinking they may be "lets just ask for more money and if it's too much, we'll pay it back at the end", because it works like that here (free loan yeah). As I did not use any more electricity than normal AND my tariff had gone DOWN, I smelled a rat...
FWIW I use about 900- 1000 kWh a month, of which 600ish goes to the car...
After talking to several people I found out that, even though I, like a nerd, fill out my online thingy every month, they ignore those and only go by the 1 "official" measurement which is taken once a year.
This was taken at a time when my car was kaputt, and hence it was a month with MUCH less use than normal, hence lower price.
I have no idea why they would do it like this, as all my data I've entered into their system is correct?