Bord Gáis Energy's residential gas customers are to see a price increase from 1 October.
The 2.04% increase will add €18.42 to an average residential gas bill annually.
The company blamed the increase on the rise in network tariffs.
Bord Gáis Energy Managing Director Dave Kirwan said the hike is regrettable, but necessary.
The gas company said it is committed to working with customers to help them to manage their bills.