Cars in Norway have a CO2 tax. But EVs get breaks on things not related to CO2 in Norway. According to Tesla's website, you don't have to pay VAT.

https://www.tesla.com/no_NO/support/incentives?redirect=no

Edit: from an old reddit post, it seems like there's a VAT, weight, engine, CO2, N0x tax. In theory, in an 'even playing field', I'm guessing EVs should be paying VAT, weight, and engine taxes. Not completely sure which of these they pay (or if the list is even correct).