According to Opplysningsradet for Veitrafikken (Information Council for Road Traffic), electric vehicles accounted for 54.3% of the new car market last year, up from 42.4% a year earlier.
The four best-selling models in the Nordic country were the Audi e-tron, the Tesla Model 3, the Volkswagen ID.3 and the Nissan Leaf — all fully electric.
The fifth placed car — the Volkswagen Golf — can be bought in a rechargeable version but the statistics do not differentiate the engine types.
In December, electric car sales set a monthly record in Norway with 66.7%, with the numbers boosted by the arrival of new models, OFV said.
Industry group Norsk elbilforening (Norwegian Electric Vehicle Association) said separately that Norway was the first country to break the overall 50% threshold.
Norway, the largest producer of oil in Western Europe, is making headway in electric mobility thanks to heavy subsidies.
The Nordic country, where electricity is primarily produced from hydroelectric dams, aims to have all new cars be “zero emission” by 2025.