National's transport spokesman Simeon Brown said of those approved applications, only about 2,000, or 10 per cent, are for full-battery electric vehicles.
The rest are fuel-efficient and hybrid cars.
"It's not achieving the dramatic increase in electric vehicles the Minister, and Government, said it would," Brown told ZB.
Brown said it's effectively a "wealth transfer", and suggested the Government, including Wood, was "getting ahead" of themselves.
"The reality is he's set up a scheme that is taxing hard-working farmers or tradies, to subsidise people who can already afford expensive electric vehicles."
Wood said the scheme specifically covers both zero and low emission options.
"The bottom line is that the National Party would abolish the scheme, which means clean cars would cost New Zealanders more", he said.
Wood is set to review the policy's fees and discounts in the coming months, as millions more in rebates are going out, than what's collected in fees.
In response to written questions by National, Wood said, as of July, "under the expanded Clean Car Discount Scheme, 19,243 rebate applications have been approved and 1,980 of these have been approved for Full Battery Electric Vehicles."
"The administration cost, including establishment costs, from inception of the scheme to 30 June 2022, was $7.8m."
Wood also revealed Waka Kotahi was forced to apologise last month, after a system maintenance error lost more than a hundred rebate applications.
"Officials contacted 163 applicants, who were affected by the system error, to apologise and request that they resubmit their applications."
Brown claims that's further proof the policy is "untargeted and untidy", after previous reports of cars getting charged incorrectly, due to wrong emissions or safety-rating data.
Former Associate Transport Minister, and current Green Party transport spokesperson, Julie-Anne Genter said the scheme is "better late than never".
She tried to get the policy up and running during the last term of Parliament, but was scuppered by New Zealand First.
"It's really important the scheme continues to be reviewed... and we're going to have to keep up with this for the next five to ten years", Genter said.
Asked about National's criticism, and promise to scrap the policy if it's voted into power, Genter said the party "has no idea what they're talking about".