Green number plates help other drivers or local authorities identify zero-emission vehicles. This helps local authorities design and put in place new policies to incentivise people to own and drive (electric cars), according to the UK Government.
As of March 2022, green number plates are only cosmetic. There are currently no such schemes running in the UK. That means that green number plates are currently just a way of showing off that you drive an electric car. However, it has become the norm for dealers to fit green number plates to new models in preparation for these schemes.
If you wish to fit green number plates onto your older electric car, they cost about £40 for a pair. Check the UK Government website for more advice about changing your licence plates.