More than 1,800 new electric cars were licensed between January and May this year compared to 490 in 2018, according to the Central Statistics Office.
Last month, there was a drop of 2.5% in the number of new private cars being licensed.
The number of used and imported private cars licensed increased by 2.7% compared to the same period last year.
So far this year, a total of 73,781 new private cars were licensed which a decrease of 7% compared to 2018, while the number of used cars licensed has increased by 3.5%.
There were 35,032 new diesel cars licensed so far this year, compared to 43,987 this time last year.
Volkswagen is the most popular car, followed by Toyota and Renault.