Unless I misread it, after the first year, there's a flat rate of £195 a year for VED:
Electric, zero or low emission cars registered on or after 1 April 2025
You will need to pay the lowest first year rate of vehicle tax set at £10 from 1 April 2025. From the second tax payment onwards, you will pay the standard rate. This will be £195.
Electric, zero or low emission cars registered between 1 April 2017 and 31 March 2025
You will pay the standard rate. This will be £195.
Electric, zero or low emission cars registered between 1 March 2001 and 31 March 2017
These vehicles will move to the first band that has a VED value. This will be £20.
Hybrid and alternatively fuelled vehicles (AFVs)
The £10 annual discount for hybrid and AFVs will be removed, and the rate you will pay will depend on when the vehicle was first registered. If the vehicle was:
Looks like my 2008 Prius will still be £20 a year... Bargain!