An "ambitious" plan to fully electrify the state government's vehicle fleet by 2030 is unlikely to be met, with the Treasurer saying less than 2 per cent has been achieved so far.

Mullighan said EVs were far more expensive than their petrol counterparts, with a Hyundai Kona Elite electric model priced at $54,500 compared with a regular Kona at $26,900.

“Many battery electric vehicles are cost prohibitive, so they are above a price threshold that the fleet would normally pay for other fleet vehicles, but of course as technology improves and volume efficiencies are achieved it is expected price parity will occur sometime in the future,” he said.