A key element is that Norway has some of the highest taxes on cars in the world, and one of highest VAT/sales tax rates, which created a very politically palat

A key element is that Norway has some of the highest taxes on cars in the world, and one of highest VAT/sales tax rates, which created a very politically palatable opportunity for very significant tax breaks, with a perfect confluence of overlap between those who wanted an environmentally friendly policy, and those who wanted less tax.